Rules Contributing to Suspicious PowerShell Script Alert Type

The following rules are used to identify suspicious activity relating to PowerShell scripts. Any one or more of these will trigger the PowerShell Script Alert. Details for each rule can be viewed by clicking the More Details link in the description.

Title

Description

PowerShell Mailbox Collection Script

Detects PowerShell scripts that can be used to collect data from mailboxes. Adversaries may target user email to collect sensitive information.

Rule ID

powershell_scriptblock_1

Query

{'selection1': {'ScriptBlockText|contains': ['Microsoft.Office.Interop.Outlook', 'Interop.Outlook.olDefaultFolders', '::olFolderInBox', 'Microsoft.Exchange.WebServices.Data.Folder', 'Microsoft.Exchange.WebServices.Data.FileAttachment']}, 'condition': 'selection1'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0009, T1059, T1059.001, T1114

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2023/01/11 medium N/A

Live Memory Dump Using Powershell

Detects usage of a PowerShell command to dump the live memory of a Windows machine

Rule ID

powershell_scriptblock_3

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-StorageDiagnosticInfo', '-IncludeLiveDump']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,cd185561-4760-45d6-a63e-a51325112cae

Author: Max Altgelt (Nextron Systems)

Tactics, Techniques, and Procedures

T1003, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/09/21 high

  • Diagnostics

Invoke-Obfuscation CLIP+ Launcher - PowerShell

Detects Obfuscated use of Clip.exe to execute PowerShell

Rule ID

powershell_scriptblock_4

Query

{'selection_4104': {'ScriptBlockText|re': '.*cmd.{0,5}(?:/c|/r).+clip(?:\\.exe)?.{0,4}&&.+clipboard]::\\(\\s\\\\"\\{\\d\\}.+-f.+"'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,73e67340-0d25-11eb-adc1-0242ac120002

Author: Jonathan Cheong, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/13 high

  • Unknown

Suspicious Service DACL Modification Via Set-Service Cmdlet - PS

Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)

Rule ID

powershell_scriptblock_5

Query

{'selection_sddl_flag': {'ScriptBlockText|contains': ['-SecurityDescriptorSddl ', '-sd ']}, 'selection_set_service': {'ScriptBlockText|contains|all': ['Set-Service ', 'D;;'], 'ScriptBlockText|contains': [';;;IU', ';;;SU', ';;;BA', ';;;SY', ';;;WD']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,22d80745-6f2c-46da-826b-77adaededd74

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1574.011

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/10/24 high

  • Rare intended use of hidden services

  • Rare FP could occure due to the non linearity of the ScriptBlockText log

Potential Invoke-Mimikatz PowerShell Script

Detects Invoke-Mimikatz PowerShell script and alike. Mimikatz is a credential dumper capable of obtaining plaintext Windows account logins and passwords.

Rule ID

powershell_scriptblock_6

Query

{'selection_1': {'ScriptBlockText|contains|all': ['DumpCreds', 'DumpCerts']}, 'selection_2': {'ScriptBlockText|contains': 'sekurlsa::logonpasswords'}, 'selection_3': {'ScriptBlockText|contains|all': ['crypto::certificates', 'CERT_SYSTEM_STORE_LOCAL_MACHINE']}, 'condition': '1 of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

SigmaHQ,189e3b02-82b2-4b90-9662-411eb64486d4

Author: Tim Rauch, Elastic (idea)

Tactics, Techniques, and Procedures

T1003, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/28 high

  • Mimikatz can be useful for testing the security of networks

Disable-WindowsOptionalFeature Command PowerShell

Detect built in PowerShell cmdlet Disable-WindowsOptionalFeature, Deployment Image Servicing and Management tool. Similar to DISM.exe, this cmdlet is used to enumerate, install, uninstall, configure, and update features and packages in Windows images

Rule ID

powershell_scriptblock_7

Query

{'selection_cmd': {'ScriptBlockText|contains|all': ['Disable-WindowsOptionalFeature', '-Online', '-FeatureName']}, 'selection_feature': {'ScriptBlockText|contains': ['Windows-Defender-Gui', 'Windows-Defender-Features', 'Windows-Defender', 'Windows-Defender-ApplicationGuard']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,99c4658d-2c5e-4d87-828d-7c066ca537c3

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1562.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/10 high

  • Unknown

Powershell DNSExfiltration

DNSExfiltrator allows for transferring (exfiltrate) a file over a DNS request covert channel

Rule ID

powershell_scriptblock_8

Query

{'selection_cmdlet': [{'ScriptBlockText|contains': 'Invoke-DNSExfiltrator'}, {'ScriptBlockText|contains|all': [' -i ', ' -d ', ' -p ', ' -doh ', ' -t ']}], 'condition': 'selection_cmdlet'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,d59d7842-9a21-4bc6-ba98-64bfe0091355

Author: frack113

Tactics, Techniques, and Procedures

T1048, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/07 high

  • Legitimate script

Powershell Empire agent CnC activity

A Powershell Empire framework agent is running on the machine, and it's trying to access the CnC server.

Rule ID

powershell_scriptblock_9

Query

{'selection1': {'ScriptBlockText|contains': 'IF($PSVERSIonTAblE.PSVERsIOn.MajOr -ge 3){'}, 'selection2': {'ScriptBlockText|contains': '[Ref].ASsEmbLY.GeTTYpe('}, 'selection3': {'ScriptBlockText|contains': 'System.Management.Automation.AmsiUtils'}, 'condition': 'selection1 and selection2 and selection3'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/05/01 medium N/A

Powershell Directory Enumeration

Detects technique used by MAZE ransomware to enumerate directories using Powershell

Rule ID

powershell_scriptblock_10

Query

{'selection': {'ScriptBlockText|contains|all': ['foreach', 'Get-ChildItem', '-Path ', '-ErrorAction ', 'SilentlyContinue', 'Out-File ', '-append']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,162e69a7-7981-4344-84a9-0f1c9a217a52

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1083

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/03/17 medium

  • Legitimate PowerShell scripts

Invoke-Obfuscation Via Use MSHTA - PowerShell

Detects Obfuscated Powershell via use MSHTA in Scripts

Rule ID

powershell_scriptblock_11

Query

{'selection_4104': {'ScriptBlockText|contains|all': ['set', '&&', 'mshta', 'vbscript:createobject', '.run', '(window.close)']}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e55a5195-4724-480e-a77e-3ebe64bd3759

Author: Nikita Nazarov, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/08 high

  • Unknown

Root Certificate Installed - PowerShell

Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.

Rule ID

powershell_scriptblock_12

Query

{'selection1': {'ScriptBlockText|contains|all': ['Move-Item', 'Cert:\\LocalMachine\\Root']}, 'selection2': {'ScriptBlockText|contains|all': ['Import-Certificate', 'Cert:\\LocalMachine\\Root']}, 'condition': '1 of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,42821614-9264-4761-acfc-5772c3286f76

Author: oscd.community, @redcanary, Zach Stanford @svch0st

Tactics, Techniques, and Procedures

T1059.001, T1553.004

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/10 medium

  • Help Desk or IT may need to manually add a corporate Root CA on occasion. Need to test if GPO push doesn't trigger FP

Clearing Windows Console History

Identifies when a user attempts to clear console history. An adversary may clear the command history of a compromised account to conceal the actions undertaken during an intrusion.

Rule ID

powershell_scriptblock_15

Query

{'selection1': {'ScriptBlockText|contains': 'Clear-History'}, 'selection2a': {'ScriptBlockText|contains': ['Remove-Item', 'rm']}, 'selection2b': {'ScriptBlockText|contains': ['ConsoleHost_history.txt', '(Get-PSReadlineOption).HistorySavePath']}, 'condition': 'selection1 or selection2a and selection2b'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,bde47d4b-9987-405c-94c7-b080410e8ea7

Author: Austin Songer @austinsonger

Tactics, Techniques, and Procedures

T1059.001, T1070, T1070.003

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/11/25 high

  • Unknown

Windows Firewall Profile Disabled

Detects when a user disables the Windows Firewall via a Profile to help evade defense.

Rule ID

powershell_scriptblock_16

Query

{'selection_args': {'ScriptBlockText|contains|all': ['Set-NetFirewallProfile ', ' -Enabled ', ' False']}, 'selection_opt': {'ScriptBlockText|contains': [' -All ', 'Public', 'Domain', 'Private']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,488b44e7-3781-4a71-888d-c95abfacf44d

Author: Austin Songer @austinsonger

Tactics, Techniques, and Procedures

T1059.001, T1562.004

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2021/10/12 medium

  • Unknown

Suspicious Portable Executable Encoded in Powershell Script

Detects the presence of a portable executable (PE) in a PowerShell script by looking for its encoded header. Attackers embed PEs into PowerShell scripts to inject them into memory, avoiding defences by not writing to disk.

Rule ID

powershell_scriptblock_17

Query

{'selection1': {'ScriptBlockText|contains': 'TVqQAAMAAAAEAAAA'}, 'selection2': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (not selection2)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, T1059, T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/15 medium N/A

PowerShell Suspicious Script with Screenshot Capabilities

Detects PowerShell scripts that can take screenshots, which is a common feature in post-exploitation kits and remote access tools (RATs).

Rule ID

powershell_scriptblock_19

Query

{'selection1': {'ScriptBlockText|contains': 'CopyFromScreen'}, 'selection2': {'ScriptBlockText|contains': 'System.Drawing.Bitmap'}, 'selection3': {'ScriptBlockText|contains': 'Drawing.Bitmap'}, 'selection4': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (selection2 or selection3) and (not selection4)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0009, T1059, T1059.001, T1113

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/19 medium N/A

Registry-Free Process Scope COR_PROFILER

Adversaries may leverage the COR_PROFILER environment variable to hijack the execution flow of programs that load the .NET CLR. The COR_PROFILER is a .NET Framework feature which allows developers to specify an unmanaged (or external of .NET) profiling DLL to be loaded into each .NET process that loads the Common Language Runtime (CLR). These profiliers are designed to monitor, troubleshoot, and debug managed code executed by the .NET CLR. (Citation: Microsoft Profiling Mar 2017) (Citation: Microsoft COR_PROFILER Feb 2013)

Rule ID

powershell_scriptblock_20

Query

{'selection': {'ScriptBlockText|contains|all': ['$env:COR_ENABLE_PROFILING', '$env:COR_PROFILER', '$env:COR_PROFILER_PATH']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,23590215-4702-4a70-8805-8dc9e58314a2

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1574.012

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/30 medium

  • Legitimate administrative script

Invoke-Obfuscation RUNDLL LAUNCHER - PowerShell

Detects Obfuscated Powershell via RUNDLL LAUNCHER

Rule ID

powershell_scriptblock_21

Query

{'selection_4104': {'ScriptBlockText|contains|all': ['rundll32.exe', 'shell32.dll', 'shellexec_rundll', 'powershell']}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e6cb92b4-b470-4eb8-8a9d-d63e8583aae0

Author: Timur Zinniatullin, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/18 medium

  • Unknown

Execution via CL_Invocation.ps1 - Powershell

Detects Execution via SyncInvoke in CL_Invocation.ps1 module

Rule ID

powershell_scriptblock_23

Query

{'selection': {'ScriptBlockText|contains|all': ['CL_Invocation.ps1', 'SyncInvoke']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,4cd29327-685a-460e-9dac-c3ab96e549dc

Author: oscd.community, Natalia Shornikova

Tactics, Techniques, and Procedures

T1059.001, T1216

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/14 high

  • Unknown

Suspicious TCP Tunnel Via PowerShell Script

Detects powershell scripts that creates sockets/listeners which could be indicative of tunneling activity

Rule ID

powershell_scriptblock_24

Query

{'selection': {'ScriptBlockText|contains|all': ['[System.Net.HttpWebRequest]', 'System.Net.Sockets.TcpListener', 'AcceptTcpClient']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,bd33d2aa-497e-4651-9893-5c5364646595

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1090

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/07/08 medium

  • Unknown

Powershell Store File In Alternate Data Stream

Storing files in Alternate Data Stream (ADS) similar to Astaroth malware.

Rule ID

powershell_scriptblock_25

Query

{'selection_compspec': {'ScriptBlockText|contains|all': ['Start-Process', '-FilePath "$env:comspec" ', '-ArgumentList ', '>']}, 'condition': 'selection_compspec'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,a699b30e-d010-46c8-bbd1-ee2e26765fe9

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1564.004

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/09/02 medium

  • Unknown

Potential PowerShell Obfuscation Using Character Join

Detects specific techniques often seen used inside of PowerShell scripts to obfscuate Alias creation

Rule ID

powershell_scriptblock_26

Query

{'selection': {'ScriptBlockText|contains|all': ['-Alias', ' -Value (-join(']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e8314f79-564d-4f79-bc13-fbc0bf2660d8

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

N/A

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/09 low

  • Unknown

Windows UAC Bypass

A User Account Control Bypass activity was detected. This can be due to either regular operation or because an attacker is trying to escalate privileges.

Rule ID

powershell_scriptblock_27

Query

{'selection1': {'ScriptBlockText|contains': 'Invoke-UACBypass'}, 'selection2': {'ScriptBlockText|contains': 'Invoke-EventVwrBypass'}, 'selection3': {'ScriptBlockText|contains': 'Invoke-SDCLTBypass'}, 'condition': 'selection1 or selection2 or selection3'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/05/01 medium N/A

Suspicious IO.FileStream

Open a handle on the drive volume via the \\.\ DOS device path specifier and perform direct access read of the first few bytes of the volume.

Rule ID

powershell_scriptblock_28

Query

{'selection': {'ScriptBlockText|contains|all': ['New-Object', 'IO.FileStream', '\\\\.\\']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,70ad982f-67c8-40e0-a955-b920c2fa05cb

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1070.003

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/09 medium

  • Legitimate PowerShell scripts

Invoke-Obfuscation VAR+ Launcher - PowerShell

Detects Obfuscated use of Environment Variables to execute PowerShell

Rule ID

powershell_scriptblock_29

Query

{'selection_4104': {'ScriptBlockText|re': '.*cmd.{0,5}(?:/c|/r)(?:\\s|)"set\\s[a-zA-Z]{3,6}.*(?:\\{\\d\\}){1,}\\\\"\\s+?-f(?:.*\\)){1,}.*"'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,0adfbc14-0ed1-11eb-adc1-0242ac120002

Author: Jonathan Cheong, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/15 high

  • Unknown

Powershell XML Execute Command

Adversaries may abuse PowerShell commands and scripts for execution. PowerShell is a powerful interactive command-line interface and scripting environment included in the Windows operating system. (Citation: TechNet PowerShell) Adversaries can use PowerShell to perform a number of actions, including discovery of information and execution of code

Rule ID

powershell_scriptblock_30

Query

{'selection_xml': {'ScriptBlockText|contains|all': ['New-Object', 'System.Xml.XmlDocument', '.Load']}, 'selection_exec': {'ScriptBlockText|contains': ['IEX ', 'Invoke-Expression ', 'Invoke-Command ', 'ICM -']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,6c6c6282-7671-4fe9-a0ce-a2dcebdc342b

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/01/19 medium

  • Legitimate administrative script

Dump Credentials from Windows Credential Manager With PowerShell

Adversaries may search for common password storage locations to obtain user credentials. Passwords are stored in several places on a system, depending on the operating system or application holding the credentials.

Rule ID

powershell_scriptblock_33

Query

{'selection_kiddie': {'ScriptBlockText|contains': ['Get-PasswordVaultCredentials', 'Get-CredManCreds']}, 'selection_rename_Password': {'ScriptBlockText|contains|all': ['New-Object', 'Windows.Security.Credentials.PasswordVault']}, 'selection_rename_credman': {'ScriptBlockText|contains|all': ['New-Object', 'Microsoft.CSharp.CSharpCodeProvider', '[System.Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory())', 'Collections.ArrayList', 'System.CodeDom.Compiler.CompilerParameters']}, 'condition': '1 of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,99c49d9c-34ea-45f7-84a7-4751ae6b2cbc

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1555

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/20 medium

  • Unknown

Potential Suspicious Windows Feature Enabled

Detects usage of the built-in PowerShell cmdlet "Enable-WindowsOptionalFeature" used as a Deployment Image Servicing and Management tool. Similar to DISM.exe, this cmdlet is used to enumerate, install, uninstall, configure, and update features and packages in Windows images

Rule ID

powershell_scriptblock_35

Query

{'selection_cmd': {'ScriptBlockText|contains|all': ['Enable-WindowsOptionalFeature', '-Online', '-FeatureName']}, 'selection_feature': {'ScriptBlockText|contains': ['TelnetServer', 'Internet-Explorer-Optional-amd64', 'TFTP', 'SMB1Protocol', 'Client-ProjFS', 'Microsoft-Windows-Subsystem-Linux']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,55c925c1-7195-426b-a136-a9396800e29b

Author: frack113

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/10 medium

  • Unknown

Suspicious PowerShell Mailbox SMTP Forward Rule

Detects usage of the powerShell Set-Mailbox Cmdlet to set-up an SMTP forwarding rule.

Rule ID

powershell_scriptblock_36

Query

{'selection': {'ScriptBlockText|contains|all': ['Set-Mailbox ', ' -DeliverToMailboxAndForward ', ' -ForwardingSmtpAddress ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,15b7abbb-8b40-4d01-9ee2-b51994b1d474

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/10/26 medium

  • Legitimate usage of the cmdlet to forward emails

Powershell Add Name Resolution Policy Table Rule

Detects powershell scripts that adds a Name Resolution Policy Table (NRPT) rule for the specified namespace. This will bypass the default DNS server and uses a specified server for answering the query.

Rule ID

powershell_scriptblock_37

Query

{'selection': {'ScriptBlockText|contains|all': ['Add-DnsClientNrptRule', '-Namesp', '-NameSe']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,4368354e-1797-463c-bc39-a309effbe8d7

Author: Borna Talebi

Tactics, Techniques, and Procedures

T1059.001, T1565

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/09/14 high

  • Unknown

Security Software Discovery by Powershell

Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-viru

Rule ID

powershell_scriptblock_38

Query

{'selection_1': {'ScriptBlockText|contains|all': ['get-process', '.Description', '-like']}, 'selection_2': {'ScriptBlockText|contains': ['"*virus*"', '"*carbonblack*"', '"*defender*"', '"*cylance*"']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,904e8e61-8edf-4350-b59c-b905fc8e810c

Author: frack113, Anish Bogati, Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1518.001

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/16 low

  • Unknown

Suspicious New-PSDrive to Admin Share

Adversaries may use to interact with a remote network share using Server Message Block (SMB). The adversary may then perform actions as the logged-on user.

Rule ID

powershell_scriptblock_39

Query

{'selection': {'ScriptBlockText|contains|all': ['New-PSDrive', '-psprovider ', 'filesystem', '-root ', '\\\\', '$']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,1c563233-030e-4a07-af8c-ee0490a66d3a

Author: frack113

Tactics, Techniques, and Procedures

T1021.002, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/08/13 medium

  • Unknown

PowerShell Script with Token Impersonation Capabilities

Detects scripts that contain PowerShell functions, structures, or Windows API functions related to token impersonation/theft. Attackers may duplicate then impersonate another user's token to escalate privileges and bypass access controls.

Rule ID

powershell_scriptblock_40

Query

{'selection1': {'ScriptBlockText|contains': ['Invoke-TokenManipulation', 'ImpersonateNamedPipeClient', 'NtImpersonateThread']}, 'selection2': {'ScriptBlockText|contains': 'STARTUPINFOEX'}, 'selection3': {'ScriptBlockText|contains': 'UpdateProcThreadAttribute'}, 'selection4': {'ScriptBlockText|contains': 'AdjustTokenPrivileges'}, 'selection5': {'ScriptBlockText|contains': 'SeDebugPrivilege'}, 'selection6': {'UserId': 'S-1-5-18'}, 'condition': '(selection1 or (selection2 and selection3) or (selection4 and selection5)) and (not selection6)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0004, T1059, T1059.001, T1106, T1134

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2022/08/17 medium N/A

Disable of ETW Trace - Powershell

Detects usage of powershell cmdlets to disable or remove ETW trace sessions

Rule ID

powershell_scriptblock_41

Query

{'selection_pwsh_remove': {'ScriptBlockText|contains': 'Remove-EtwTraceProvider '}, 'selection_pwsh_set': {'ScriptBlockText|contains|all': ['Set-EtwTraceProvider ', '0x11']}, 'condition': '1 of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,115fdba9-f017-42e6-84cf-d5573bf2ddf8

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1070, T1562.006

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/06/28 high

  • Unknown

Service Registry Permissions Weakness Check

Adversaries may execute their own malicious payloads by hijacking the Registry entries used by services. Adversaries may use flaws in the permissions for registry to redirect from the originally specified executable to one that they control, in order to launch their own code at Service start. Windows stores local service configuration information in the Registry under HKLM\SYSTEM\CurrentControlSet\Services

Rule ID

powershell_scriptblock_42

Query

{'selection': {'ScriptBlockText|contains|all': ['get-acl', 'REGISTRY::HKLM\\SYSTEM\\CurrentControlSet\\Services\\']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,95afc12e-3cbb-40c3-9340-84a032e596a3

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1574.011

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/30 medium

  • Legitimate administrative script

Potential COM Objects Download Cradles Usage - PS Script

Detects usage of COM objects that can be abused to download files in PowerShell by CLSID

Rule ID

powershell_scriptblock_43

Query

{'selection_1': {'ScriptBlockText|contains': '[Type]::GetTypeFromCLSID('}, 'selection_2': {'ScriptBlockText|contains': ['0002DF01-0000-0000-C000-000000000046', 'F6D90F16-9C73-11D3-B32E-00C04F990BB4', 'F5078F35-C551-11D3-89B9-0000F81FE221', '88d96a0a-f192-11d4-a65f-0040963251e5', 'AFBA6B42-5692-48EA-8141-DC517DCF0EF1', 'AFB40FFD-B609-40A3-9828-F88BBE11E4E3', '88d96a0b-f192-11d4-a65f-0040963251e5', '2087c2f4-2cef-4953-a8ab-66779b670495', '000209FF-0000-0000-C000-000000000046', '00024500-0000-0000-C000-000000000046']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Script Block Logging must be enable

Rule Source

SigmaHQ,3c7d1587-3b13-439f-9941-7d14313dbdfe

Author: frack113

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/12/25 medium

  • Legitimate use of the library

Dnscat Execution

Dnscat exfiltration tool execution

Rule ID

powershell_scriptblock_44

Query

{'selection': {'ScriptBlockText|contains': 'Start-Dnscat2'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,a6d67db4-6220-436d-8afc-f3842fe05d43

Author: Daniil Yugoslavskiy, oscd.community

Tactics, Techniques, and Procedures

T1048, T1059.001, T1059.001

References

N/A

Severity

95

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2019/10/24 critical

  • Legitimate usage of PowerShell Dnscat2 — DNS Exfiltration tool (unlikely)

Suspicious Unblock-File

Remove the Zone.Identifier alternate data stream which identifies the file as downloaded from the internet.

Rule ID

powershell_scriptblock_45

Query

{'selection': {'ScriptBlockText|contains|all': ['Unblock-File ', '-Path ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,5947497f-1aa4-41dd-9693-c9848d58727d

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1553.005

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/02/01 medium

  • Legitimate PowerShell scripts

AMSI Bypass Pattern Assembly GetType

Detects code fragments found in small and obfuscated AMSI bypass PowerShell scripts

Rule ID

powershell_scriptblock_47

Query

{'selection': {'ScriptBlockText|contains|all': ['[Ref].Assembly.GetType', 'SetValue($null,$true)', 'NonPublic,Static']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e0d6c087-2d1c-47fd-8799-3904103c5a98

Author: Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1562.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/11/09 high

  • Unknown

Remove Account From Domain Admin Group

Adversaries may interrupt availability of system and network resources by inhibiting access to accounts utilized by legitimate users. Accounts may be deleted, locked, or manipulated (ex: changed credentials) to remove access to accounts.

Rule ID

powershell_scriptblock_48

Query

{'selection': {'ScriptBlockText|contains|all': ['Remove-ADGroupMember', '-Identity ', '-Members ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,48a45d45-8112-416b-8a67-46e03a4b2107

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1531

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/26 medium

  • Unknown

Suspicious Hyper-V Cmdlets

Adversaries may carry out malicious operations using a virtual instance to avoid detection

Rule ID

powershell_scriptblock_49

Query

{'selection': {'ScriptBlockText|contains': ['New-VM', 'Set-VMFirmware', 'Start-VM']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,42d36aa1-3240-4db0-8257-e0118dcdd9cd

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1564.006

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/04/09 medium

  • Legitimate PowerShell scripts

Zip A Folder With PowerShell For Staging In Temp - PowerShell Script

Use living off the land tools to zip a file and stage it in the Windows temporary folder for later exfiltration

Rule ID

powershell_scriptblock_50

Query

{'selection_4104': {'ScriptBlockText|contains|all': ['Compress-Archive ', ' -Path ', ' -DestinationPath ', '$env:TEMP\\']}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,b7a3c9a3-09ea-4934-8864-6a32cacd98d9

Author: Nasreddine Bencherchali (Nextron Systems), frack113

Tactics, Techniques, and Procedures

T1059.001, T1074.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2021/07/20 medium

  • Unknown

PowerShell ShellCode

Detects Base64 encoded Shellcode

Rule ID

powershell_scriptblock_52

Query

{'selection': {'ScriptBlockText|contains': 'AAAAYInlM'}, 'selection2': {'ScriptBlockText|contains': ['OiCAAAAYInlM', 'OiJAAAAYInlM']}, 'condition': 'selection and selection2'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,16b37b70-6fcf-4814-a092-c36bd3aafcbd

Author: David Ledbetter (shellcode), Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1055, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2018/11/17 high

  • Unknown

Suspicious Eventlog Clear

Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the windows event logs

Rule ID

powershell_scriptblock_53

Query

{'selection': {'ScriptBlockText|contains': ['Clear-EventLog ', 'Remove-EventLog ', 'Limit-EventLog ', 'Clear-WinEvent ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,0f017df3-8f5a-414f-ad6b-24aff1128278

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1070.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/12 medium

  • Rare need to clear logs before doing something. Sometimes used by installers or cleaner scripts. The script should be investigated to determine if it's legitimate

Powershell Local Email Collection

Adversaries may target user email on local systems to collect sensitive information. Files containing email data can be acquired from a users local system, such as Outlook storage or cache files.

Rule ID

powershell_scriptblock_54

Query

{'selection': {'ScriptBlockText|contains': ['Get-Inbox.ps1', 'Microsoft.Office.Interop.Outlook', 'Microsoft.Office.Interop.Outlook.olDefaultFolders', '-comobject outlook.application']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,2837e152-93c8-43d2-85ba-c3cd3c2ae614

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1114.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/07/21 medium

  • Unknown

Suspicious FromBase64String Usage On Gzip Archive - Ps Script

Detects attempts of decoding a base64 Gzip archive in a PowerShell script. This technique is often used as a method to load malicious content into memory afterward.

Rule ID

powershell_scriptblock_55

Query

{'selection': {'ScriptBlockText|contains|all': ['FromBase64String', 'MemoryStream', 'H4sI']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,df69cb1d-b891-4cd9-90c7-d617d90100ce

Author: frack113

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/12/23 medium

  • Legitimate administrative script

PowerShell ADRecon Execution

Detects execution of ADRecon.ps1 for AD reconnaissance which has been reported to be actively used by FIN7

Rule ID

powershell_scriptblock_56

Query

{'selection': {'ScriptBlockText|contains': ['Function Get-ADRExcelComOb', 'Get-ADRGPO', 'Get-ADRDomainController', 'ADRecon-Report.xlsx']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,bf72941a-cba0-41ea-b18c-9aca3925690d

Author: Bhabesh Raj

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2021/07/16 high

  • Unknown

Access to Browser Login Data

Adversaries may acquire credentials from web browsers by reading files specific to the target browser. Web browsers commonly save credentials such as website usernames and passwords so that they do not need to be entered manually in the future. Web browsers typically store the credentials in an encrypted format within a credential store.

Rule ID

powershell_scriptblock_57

Query

{'selection_cmd': {'ScriptBlockText|contains|all': ['Copy-Item', '-Destination']}, 'selection_path': {'ScriptBlockText|contains': ['\\Opera Software\\Opera Stable\\Login Data', '\\Mozilla\\Firefox\\Profiles', '\\Microsoft\\Edge\\User Data\\Default', '\\Google\\Chrome\\User Data\\Default\\Login Data', '\\Google\\Chrome\\User Data\\Default\\Login Data For Account']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,fc028194-969d-4122-8abe-0470d5b8f12f

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1555.003

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/30 medium

  • Unknown

Abuse of Service Permissions to Hide Services Via Set-Service - PS

Detects usage of the "Set-Service" powershell cmdlet to configure a new SecurityDescriptor that allows a service to be hidden from other utilities such as "sc.exe", "Get-Service"...etc. (Works only in powershell 7)

Rule ID

powershell_scriptblock_58

Query

{'selection': {'ScriptBlockText|contains|all': ['Set-Service ', 'DCLCWPDTSD'], 'ScriptBlockText|contains': ['-SecurityDescriptorSddl ', '-sd ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,953945c5-22fe-4a92-9f8a-a9edc1e522da

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1574.011

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/10/17 high

  • Rare intended use of hidden services

  • Rare FP could occure due to the non linearity of the ScriptBlockText log

Computer Discovery And Export Via Get-ADComputer Cmdlet - PowerShell

Detects usage of the Get-ADComputer cmdlet to collect computer information and output it to a file

Rule ID

powershell_scriptblock_59

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-ADComputer ', ' -Filter *'], 'ScriptBlockText|contains': [' | Select ', 'Out-File', 'Set-Content', 'Add-Content']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,db885529-903f-4c5d-9864-28fe199e6370

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1033, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/11/17 medium

  • Legitimate admin scripts may use the same technique, it's better to exclude specific computers or users who execute these commands or scripts often

PowerShell PSAttack

Detects the use of PSAttack PowerShell hack tool

Rule ID

powershell_scriptblock_60

Query

{'selection': {'ScriptBlockText|contains': 'PS ATTACK!!!'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,b7ec41a4-042c-4f31-a5db-d0fcde9fa5c5

Author: Sean Metcalf (source), Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2017/03/05 high

  • Unknown

PowerShell Invoke-NinjaCopy script

Detects PowerShell scripts that contain the default exported functions used on Invoke-NinjaCopy. Attackers can use Invoke-NinjaCopy to read SYSTEM files that are normally locked, such as the NTDS.dit file or registry hives.

Rule ID

powershell_scriptblock_61

Query

{'selection1': {'ScriptBlockText|contains': ['StealthReadFile', 'StealthReadFileAddr', 'StealthCloseFileDelegate', 'StealthOpenFile', 'StealthCloseFile', 'Invoke-NinjaCopy']}, 'selection2': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (not selection2)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0006, T1003, T1059, T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2023/01/23 medium N/A

Delete Volume Shadow Copies via WMI with PowerShell - PS Script

Deletes Windows Volume Shadow Copies with PowerShell code and Get-WMIObject. This technique is used by numerous ransomware families such as Sodinokibi/REvil

Rule ID

powershell_scriptblock_62

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-WmiObject', 'Win32_Shadowcopy', '.Delete()']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e17121b4-ef2a-4418-8a59-12fb1631fa9e

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1490

References

Severity

80

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/26 high

  • Unknown

PowerShell ICMP Exfiltration

Detects Exfiltration Over Alternative Protocol - ICMP. Adversaries may steal data by exfiltrating it over an un-encrypted network protocol other than that of the existing command and control channel.

Rule ID

powershell_scriptblock_63

Query

{'selection': {'ScriptBlockText|contains|all': ['New-Object', 'System.Net.NetworkInformation.Ping', '.Send(']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,4c4af3cd-2115-479c-8193-6b8bfce9001c

Author: Bartlomiej Czyz @bczyz1, oscd.community

Tactics, Techniques, and Procedures

T1048.003, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2020/10/10 medium

  • Legitimate usage of System.Net.NetworkInformation.Ping class

AD Groups Or Users Enumeration Using PowerShell - ScriptBlock

Adversaries may attempt to find domain-level groups and permission settings. The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as domain administrators.

Rule ID

powershell_scriptblock_64

Query

{'test_2': {'ScriptBlockText|contains': 'get-ADPrincipalGroupMembership'}, 'test_7': {'ScriptBlockText|contains|all': ['get-aduser', '-f ', '-pr ', 'DoesNotRequirePreAuth']}, 'condition': '1 of test_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,88f0884b-331d-403d-a3a1-b668cf035603

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1069.001

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/15 low

  • Unknown

Tamper Windows Defender Remove-MpPreference - ScriptBlockLogging

Detects attempts to remove windows defender configuration using the 'MpPreference' cmdlet

Rule ID

powershell_scriptblock_65

Query

{'selection_remove': {'ScriptBlockText|contains': 'Remove-MpPreference'}, 'selection_tamper': {'ScriptBlockText|contains': ['-ControlledFolderAccessProtectedFolders ', '-AttackSurfaceReductionRules_Ids ', '-AttackSurfaceReductionRules_Actions ', '-CheckForSignaturesBeforeRunningScan ']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,ae2bdd58-0681-48ac-be7f-58ab4e593458

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1562.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/08/05 high

  • Legitimate PowerShell scripts

Invoke-Obfuscation COMPRESS OBFUSCATION - PowerShell

Detects Obfuscated Powershell via COMPRESS OBFUSCATION

Rule ID

powershell_scriptblock_66

Query

{'selection_4104': {'ScriptBlockText|contains|all': ['new-object', 'text.encoding]::ascii'], 'ScriptBlockText|contains': ['system.io.compression.deflatestream', 'system.io.streamreader'], 'ScriptBlockText|endswith': 'readtoend'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,20e5497e-331c-4cd5-8d36-935f6e2a9a07

Author: Timur Zinniatullin, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/18 medium

  • Unknown

Potential Data Exfiltration Via Audio File

Detects potential exfiltration attempt via audio file using PowerShell

Rule ID

powershell_scriptblock_67

Query

{'selection_main': {'ScriptBlockText|contains|all': ['[System.Math]::', '[IO.FileMode]::', 'BinaryWriter']}, 'selection_header_wav': {'ScriptBlockText|contains|all': ['0x52', '0x49', '0x46', '0x57', '0x41', '0x56', '0x45', '0xAC']}, 'condition': 'selection_main and 1 of selection_header_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e4f93c99-396f-47c8-bb0f-201b1fa69034

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/16 medium

  • Unknown

Create Volume Shadow Copy with Powershell

Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information

Rule ID

powershell_scriptblock_68

Query

{'selection': {'ScriptBlockText|contains|all': ['win32_shadowcopy', ').Create(', 'ClientAccessible']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,afd12fed-b0ec-45c9-a13d-aa86625dac81

Author: frack113

Tactics, Techniques, and Procedures

T1003.003, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/12 high

  • Legitimate PowerShell scripts

Invoke-Obfuscation Obfuscated IEX Invocation - PowerShell

Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block \u2014

Rule ID

powershell_scriptblock_69

Query

{'selection_iex': [{'ScriptBlockText|re': '\\$PSHome\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$PSHome\\['}, {'ScriptBlockText|re': '\\$ShellId\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$ShellId\\['}, {'ScriptBlockText|re': '\\$env:Public\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$env:Public\\['}, {'ScriptBlockText|re': '\\$env:ComSpec\\[(\\s*\\d{1,3}\\s*,){2}'}, {'ScriptBlockText|re': '\\*mdr\\*\\W\\s*\\)\\.Name'}, {'ScriptBlockText|re': '\\$VerbosePreference\\.ToString\\('}], 'condition': 'selection_iex'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,1b9dc62e-6e9e-42a3-8990-94d7a10007f7

Author: Daniel Bohannon (@Mandiant/@FireEye), oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2019/11/08 high

  • Unknown

Malicious ShellIntel PowerShell Commandlets

Detects Commandlet names from ShellIntel exploitation scripts.

Rule ID

powershell_scriptblock_70

Query

{'selection': {'ScriptBlockText|contains': ['Invoke-SMBAutoBrute', 'Invoke-GPOLinks', 'Invoke-Potato']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,402e1e1d-ad59-47b6-bf80-1ee44985b3a7

Author: Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/08/09 high

  • Unknown

Change User Agents with WebRequest

Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.

Rule ID

powershell_scriptblock_71

Query

{'selection': {'ScriptBlockText|contains|all': ['Invoke-WebRequest', '-UserAgent ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,d4488827-73af-4f8d-9244-7b7662ef046e

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1071.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/01/23 medium

  • Unknown

Powershell Timestomp

Adversaries may modify file time attributes to hide new or changes to existing files. Timestomping is a technique that modifies the timestamps of a file (the modify, access, create, and change times), often to mimic files that are in the same folder.

Rule ID

powershell_scriptblock_72

Query

{'selection_ioc': {'ScriptBlockText|contains': ['.CreationTime =', '.LastWriteTime =', '.LastAccessTime =', '[IO.File]::SetCreationTime', '[IO.File]::SetLastAccessTime', '[IO.File]::SetLastWriteTime']}, 'condition': 'selection_ioc'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,c6438007-e081-42ce-9483-b067fbef33c3

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1070.006

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/08/03 medium

  • Legitimate admin script

Powershell MsXml COM Object

Adversaries may abuse PowerShell commands and scripts for execution. PowerShell is a powerful interactive command-line interface and scripting environment included in the Windows operating system. (Citation: TechNet PowerShell) Adversaries can use PowerShell to perform a number of actions, including discovery of information and execution of code

Rule ID

powershell_scriptblock_73

Query

{'selection': {'ScriptBlockText|contains|all': ['New-Object', '-ComObject', 'MsXml2.', 'XmlHttp']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,78aa1347-1517-4454-9982-b338d6df8343

Author: frack113, MatilJ

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/01/19 medium

  • Legitimate administrative script

User Discovery And Export Via Get-ADUser Cmdlet - PowerShell

Detects usage of the Get-ADUser cmdlet to collect user information and output it to a file

Rule ID

powershell_scriptblock_74

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-ADUser ', ' -Filter *'], 'ScriptBlockText|contains': [' > ', ' | Select ', 'Out-File', 'Set-Content', 'Add-Content']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,c2993223-6da8-4b1a-88ee-668b8bf315e9

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1033, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/11/17 medium

  • Legitimate admin scripts may use the same technique, it's better to exclude specific computers or users who execute these commands or scripts often

Active Directory Group Enumeration With Get-AdGroup

Detects usage of the "Get-AdGroup" cmdlet to enumerate Groups within Active Directory

Rule ID

powershell_scriptblock_75

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-AdGroup ', '-Filter']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,8c3a6607-b7dc-4f0d-a646-ef38c00b76ee

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1069.002

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/03/17 low

  • Unknown

WMIC Unquoted Services Path Lookup - PowerShell

Detects known WMI recon method to look for unquoted service paths, often used by pentest inside of powershell scripts attackers enum scripts

Rule ID

powershell_scriptblock_76

Query

{'selection': {'ScriptBlockText|contains': ['Get-WmiObject ', 'gwmi '], 'ScriptBlockText|contains|all': [' Win32_Service ', 'Name', 'DisplayName', 'PathName', 'StartMode']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,09658312-bc27-4a3b-91c5-e49ab9046d1b

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1047, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/06/20 medium

  • Unknown

Get-ADUser Enumeration Using UserAccountControl Flags

Detects AS-REP roasting is an attack that is often-overlooked. It is not very common as you have to explicitly set accounts that do not require pre-authentication.

Rule ID

powershell_scriptblock_77

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-ADUser', '-Filter', 'useraccountcontrol', '-band', '4194304']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,96c982fe-3d08-4df4-bed2-eb14e02f21c8

Author: frack113

Tactics, Techniques, and Procedures

T1033, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/03/17 medium

  • Legitimate PowerShell scripts

Windows Defender Exclusions Added - PowerShell

Detects modifications to the Windows Defender configuration settings using PowerShell to add exclusions

Rule ID

powershell_scriptblock_79

Query

{'selection_args_exc': {'ScriptBlockText|contains': [' -ExclusionPath ', ' -ExclusionExtension ', ' -ExclusionProcess ', ' -ExclusionIpAddress ']}, 'selection_args_pref': {'ScriptBlockText|contains': ['Add-MpPreference ', 'Set-MpPreference ']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,c1344fa2-323b-4d2e-9176-84b4d4821c88

Author: Tim Rauch, Elastic (idea)

Tactics, Techniques, and Procedures

T1059, T1059.001, T1562

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/16 medium

  • Unknown

Suspicious Get-ADReplAccount

The DSInternals PowerShell Module exposes several internal features of Active Directory and Microsoft Entra ID. These include FIDO2 and NGC key auditing, offline ntds.dit file manipulation, password auditing, DC recovery from IFM backups and password hash calculation.

Rule ID

powershell_scriptblock_80

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-ADReplAccount', '-All ', '-Server ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,060c3ef1-fd0a-4091-bf46-e7d625f60b73

Author: frack113

Tactics, Techniques, and Procedures

T1003.006, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/02/06 medium

  • Legitimate PowerShell scripts

PowerShell Suspicious Script with Audio Capture Capabilities

Detects PowerShell scripts that can record audio, a common feature in popular post-exploitation tooling.

Rule ID

powershell_scriptblock_81

Query

{'selection1': {'ScriptBlockText|contains': 'Get-MicrophoneAudio'}, 'selection2': {'ScriptBlockText|contains': 'waveInGetNumDevs'}, 'selection3': {'ScriptBlockText|contains': 'mciSendStringA'}, 'selection4': {'UserId': 'S-1-5-18'}, 'condition': '(selection1 or (selection2 and selection3)) and (not selection4)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0009, T1059, T1059.001, T1123

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/19 medium N/A

PowerShell Suspicious Script with Clipboard Retrieval Capabilities

Detects PowerShell scripts that can get the contents of the clipboard, which attackers can abuse to retrieve sensitive information like credentials, messages, etc.

Rule ID

powershell_scriptblock_82

Query

{'selection1': {'ScriptBlockText|contains': 'Get-Clipboard'}, 'selection2': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (not selection2)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0009, T1059, T1059.001, T1115

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2023/01/12 medium N/A

PowerShell Get-Process LSASS in ScriptBlock

Detects a Get-Process command on lsass process, which is in almost all cases a sign of malicious activity

Rule ID

powershell_scriptblock_83

Query

{'selection': {'ScriptBlockText|contains': 'Get-Process lsass'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,84c174ab-d3ef-481f-9c86-a50d0b8e3edb

Author: Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1003.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/04/23 high

  • Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)

Password Policy Discovery With Get-AdDefaultDomainPasswordPolicy

Detetcts PowerShell activity in which Get-Addefaultdomainpasswordpolicy is used to get the default password policy for an Active Directory domain.

Rule ID

powershell_scriptblock_84

Query

{'selection': {'ScriptBlockText|contains': 'Get-AdDefaultDomainPasswordPolicy'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,bbb9495b-58fc-4016-b9df-9a3a1b67ca82

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1201

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/03/17 low

  • Legitimate PowerShell scripts

Suspicious PowerShell Invocations - Generic

Detects suspicious PowerShell invocation command parameters

Rule ID

powershell_scriptblock_85

Query

{'selection_encoded': {'ScriptBlockText|contains': [' -enc ', ' -EncodedCommand ', ' -ec ']}, 'selection_hidden': {'ScriptBlockText|contains': [' -w hidden ', ' -window hidden ', ' -windowstyle hidden ', ' -w 1 ']}, 'selection_noninteractive': {'ScriptBlockText|contains': [' -noni ', ' -noninteractive ']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,ed965133-513f-41d9-a441-e38076a0798f

Author: Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

N/A

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2017/03/12 high

  • Very special / sneaky PowerShell scripts

Powershell Suspicious Win32_PnPEntity

Adversaries may attempt to gather information about attached peripheral devices and components connected to a computer system.

Rule ID

powershell_scriptblock_86

Query

{'selection': {'ScriptBlockText|contains': 'Win32_PnPEntity'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,b26647de-4feb-4283-af6b-6117661283c5

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1120

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/08/23 low

  • Admin script

NTFS Alternate Data Stream

Detects writing data into NTFS alternate data streams from powershell. Needs Script Block Logging.

Rule ID

powershell_scriptblock_88

Query

{'selection_content': {'ScriptBlockText|contains': ['set-content', 'add-content']}, 'selection_stream': {'ScriptBlockText|contains': '-stream'}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,8c521530-5169-495d-a199-0a3a881ad24e

Author: Sami Ruohonen

Tactics, Techniques, and Procedures

T1059.001, T1059.001, T1564.004

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2018/07/24 high

  • Unknown

Suspicious Invoke-Item From Mount-DiskImage

Adversaries may abuse container files such as disk image (.iso, .vhd) file formats to deliver malicious payloads that may not be tagged with MOTW.

Rule ID

powershell_scriptblock_89

Query

{'selection': {'ScriptBlockText|contains|all': ['Mount-DiskImage ', '-ImagePath ', 'Get-Volume', '.DriveLetter', 'invoke-item ', '):\\']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,902cedee-0398-4e3a-8183-6f3a89773a96

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1553.005

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/02/01 medium

  • Legitimate PowerShell scripts

PowerShell WMI Win32_Product Install MSI

Detects the execution of an MSI file using PowerShell and the WMI Win32_Product class

Rule ID

powershell_scriptblock_90

Query

{'selection': {'ScriptBlockText|contains|all': ['Invoke-CimMethod ', '-ClassName ', 'Win32_Product ', '-MethodName ', '.msi']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,91109523-17f0-4248-a800-f81d9e7c081d

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1218.007

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/04/24 medium

  • Unknown

Suspicious GetTypeFromCLSID ShellExecute

Detects suspicious Powershell code that execute COM Objects

Rule ID

powershell_scriptblock_92

Query

{'selection': {'ScriptBlockText|contains|all': ['::GetTypeFromCLSID(', '.ShellExecute(']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,8bc063d5-3a3a-4f01-a140-bc15e55e8437

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1546.015

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/04/02 medium

  • Legitimate PowerShell scripts

Silence.EDA Detection

Detects Silence EmpireDNSAgent as described in the Group-IP report

Rule ID

powershell_scriptblock_93

Query

{'empire': {'ScriptBlockText|contains|all': ['System.Diagnostics.Process', 'Stop-Computer', 'Restart-Computer', 'Exception in execution', '$cmdargs', 'Close-Dnscat2Tunnel']}, 'dnscat': {'ScriptBlockText|contains|all': ['set type=$LookupType`nserver', '$Command | nslookup 2>&1 | Out-String', 'New-RandomDNSField', '[Convert]::ToString($SYNOptions, 16)', '$Session.Dead = $True', '$Session["Driver"] -eq']}, 'condition': 'empire and dnscat'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,3ceb2083-a27f-449a-be33-14ec1b7cc973

Author: Alina Stepchenkova, Group-IB, oscd.community

Tactics, Techniques, and Procedures

T1059.001, T1059.001, T1071.004, T1529, T1572

References

Severity

95

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2019/11/01 critical

  • Unknown

Potential Active Directory Enumeration Using AD Module - PsScript

Detects usage of the "Import-Module" cmdlet to load the "Microsoft.ActiveDirectory.Management.dl" DLL. Which is often used by attackers to perform AD enumeration.

Rule ID

powershell_scriptblock_94

Query

{'selection_generic': {'ScriptBlockText|contains|all': ['Import-Module ', 'Microsoft.ActiveDirectory.Management.dll']}, 'selection_specific': {'ScriptBlockText|contains': 'ipmo Microsoft.ActiveDirectory.Management.dll'}, 'condition': '1 of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enable

Rule Source

SigmaHQ,9e620995-f2d8-4630-8430-4afd89f77604

Author: frack113, Nasreddine Bencherchali

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/22 medium

  • Legitimate use of the library for administrative activity

Automated Collection Bookmarks Using Get-ChildItem PowerShell

Adversaries may enumerate browser bookmarks to learn more about compromised hosts. Browser bookmarks may reveal personal information about users (ex: banking sites, interests, social media, etc.) as well as details about internal network resources such as servers, tools/dashboards, or other related infrastructure.

Rule ID

powershell_scriptblock_95

Query

{'selection': {'ScriptBlockText|contains|all': ['Get-ChildItem', ' -Recurse ', ' -Path ', ' -Filter Bookmarks', ' -ErrorAction SilentlyContinue', ' -Force']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e0565f5d-d420-4e02-8a68-ac00d864f9cf

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1217

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/13 low

  • Unknown

SyncAppvPublishingServer Execution to Bypass Powershell Restriction

Detects SyncAppvPublishingServer process execution which usually utilized by adversaries to bypass PowerShell execution restrictions.

Rule ID

powershell_scriptblock_96

Query

{'selection': {'ScriptBlockText|contains': 'SyncAppvPublishingServer.exe'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,dddfebae-c46f-439c-af7a-fdb6bde90218

Author: Ensar Şamil, @sblmsrsn, OSCD Community

Tactics, Techniques, and Procedures

T1059.001, T1218

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2020/10/05 medium

  • App-V clients

Disable Powershell Command History

Detects scripts or commands that disabled the Powershell command history by removing psreadline module

Rule ID

powershell_scriptblock_97

Query

{'selection': {'ScriptBlockText|contains|all': ['Remove-Module', 'psreadline']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,602f5669-6927-4688-84db-0d4b7afb2150

Author: Ali Alwashali

Tactics, Techniques, and Procedures

T1059.001, T1070.003

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/08/21 high

  • Legitimate script that disables the command history

Manipulation of User Computer or Group Security Principals Across AD

Adversaries may create a domain account to maintain access to victim systems. Domain accounts are those managed by Active Directory Domain Services where access and permissions are configured across systems and services that are part of that domain..

Rule ID

powershell_scriptblock_98

Query

{'selection': {'ScriptBlockText|contains': 'System.DirectoryServices.AccountManagement'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,b29a93fb-087c-4b5b-a84d-ee3309e69d08

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1136.002

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/28 medium

  • Legitimate administrative script

PowerShell Suspicious Payload Encoded and Compressed

Identifies the use of .NET functionality for decompression and base64 decoding combined in PowerShell scripts, which malware and security tools heavily use to deobfuscate payloads and load them directly in memory to bypass defenses.

Rule ID

powershell_scriptblock_99

Query

{'selection1': {'ScriptBlockText|contains': 'System.IO.Compression.DeflateStream'}, 'selection2': {'ScriptBlockText|contains': 'System.IO.Compression.GzipStream'}, 'selection3': {'ScriptBlockText|contains': 'IO.Compression.DeflateStream'}, 'selection4': {'ScriptBlockText|contains': 'IO.Compression.GzipStream'}, 'selection5': {'ScriptBlockText|contains': 'FromBase64String'}, 'selection6': {'UserId': 'S-1-5-18'}, 'condition': '(selection1 or selection2 or selection3 or selection4) and selection5 and (not selection6)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0005, T1027, T1059, T1059.001, T1140

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/19 medium

  • Legitimate PowerShell Scripts which makes use of compression and encoding.

Powershell Trigger Profiles by Add_Content

Adversaries may gain persistence and elevate privileges by executing malicious content triggered by PowerShell profiles.

Rule ID

powershell_scriptblock_100

Query

{'selection': {'ScriptBlockText|contains|all': ['Add-Content', '$profile', '-Value'], 'ScriptBlockText|contains': ['Start-Process', '""']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,05b3e303-faf0-4f4a-9b30-46cc13e69152

Author: frack113, Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1546.013

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/08/18 medium

  • Unknown

Windows Screen Capture with CopyFromScreen

Adversaries may attempt to take screen captures of the desktop to gather information over the course of an operation. Screen capturing functionality may be included as a feature of a remote access tool used in post-compromise operations

Rule ID

powershell_scriptblock_101

Query

{'selection': {'ScriptBlockText|contains': '.CopyFromScreen'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,d4a11f63-2390-411c-9adf-d791fd152830

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1113

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2021/12/28 medium

  • Unknown

Clear PowerShell History - PowerShell

Detects keywords that could indicate clearing PowerShell history

Rule ID

powershell_scriptblock_102

Query

{'selection1a': {'ScriptBlockText|contains': ['del', 'Remove-Item', 'rm']}, 'selection1b': {'ScriptBlockText|contains': '(Get-PSReadlineOption).HistorySavePath'}, 'selection_2': {'ScriptBlockText|contains|all': ['Set-PSReadlineOption', '–HistorySaveStyle', 'SaveNothing']}, 'selection_3': {'ScriptBlockText|contains|all': ['Set-PSReadlineOption', '-HistorySaveStyle', 'SaveNothing']}, 'condition': '1 of selection_* or all of selection1*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,26b692dc-1722-49b2-b496-a8258aa6371d

Author: Ilyas Ochkov, Jonhnathan Ribeiro, Daniil Yugoslavskiy, oscd.community

Tactics, Techniques, and Procedures

T1059.001, T1070.003

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/01/25 medium

  • Legitimate PowerShell scripts

PowerShell Share Enumeration Script

Detects scripts that contain PowerShell functions, structures, or Windows API functions related to windows share enumeration activities. Attackers, mainly ransomware groups, commonly identify and inspect network shares, looking for critical information for encryption and/or exfiltration.

Rule ID

powershell_scriptblock_103

Query

{'selection1': {'ScriptBlockText|contains': ['Invoke-ShareFinder', 'Invoke-ShareFinderThreaded']}, 'selection2': {'ScriptBlockText|contains': 'shi1_netname'}, 'selection3': {'ScriptBlockText|contains': 'shi1_remark'}, 'selection4': {'ScriptBlockText|contains': 'NetShareEnum'}, 'selection5': {'ScriptBlockText|contains': 'NetApiBufferFree'}, 'selection6': {'UserId': 'S-1-5-18'}, 'condition': '(selection1 or (selection2 and selection3) or (selection4 and selection5)) and (not selection6)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0007, T1059, T1059.001, T1106, T1135

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2022/08/17 medium N/A

DirectorySearcher Powershell Exploitation

Enumerates Active Directory to determine computers that are joined to the domain

Rule ID

powershell_scriptblock_104

Query

{'selection': {'ScriptBlockText|contains|all': ['New-Object ', 'System.DirectoryServices.DirectorySearcher', '.PropertiesToLoad.Add', '.findall()', 'Properties.name']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,1f6399cf-2c80-4924-ace1-6fcff3393480

Author: frack113

Tactics, Techniques, and Procedures

T1018, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/02/12 medium

  • Unknown

Invoke-Obfuscation STDIN+ Launcher - Powershell

Detects Obfuscated use of stdin to execute PowerShell

Rule ID

powershell_scriptblock_105

Query

{'selection_4104': {'ScriptBlockText|re': '.*cmd.{0,5}(?:/c|/r).+powershell.+(?:\\$?\\{?input\\}?|noexit).+"'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,779c8c12-0eb1-11eb-adc1-0242ac120002

Author: Jonathan Cheong, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/15 high

  • Unknown

Powershell Install a DLL in System Directory

Uses PowerShell to install/copy a a file into a system directory such as "System32" or "SysWOW64"

Rule ID

powershell_scriptblock_106

Query

{'selection_copy': {'ScriptBlockText|contains|all': ['Copy-Item ', '-Destination ']}, 'selection_paths': {'ScriptBlockText|contains': ['\\Windows\\System32', '\\Windows\\SysWOW64']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,63bf8794-9917-45bc-88dd-e1b5abc0ecfd

Author: frack113, Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1556.002

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2021/12/27 high

  • Unknown

Deletion of Volume Shadow Copies via WMI with PowerShell - PS Script

Detects deletion of Windows Volume Shadow Copies with PowerShell code and Get-WMIObject. This technique is used by numerous ransomware families such as Sodinokibi/REvil

Rule ID

powershell_scriptblock_107

Query

{'selection_get': {'ScriptBlockText|contains': ['Get-WmiObject', 'gwmi', 'Get-CimInstance', 'gcim']}, 'selection_shadowcopy': {'ScriptBlockText|contains': 'Win32_Shadowcopy'}, 'selection_delete': {'ScriptBlockText|contains': ['.Delete()', 'Remove-WmiObject', 'rwmi', 'Remove-CimInstance', 'rcim']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

SigmaHQ,c1337eb8-921a-4b59-855b-4ba188ddcc42

Author: Tim Rauch

Tactics, Techniques, and Procedures

T1059.001, T1490

References

Severity

80

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/20 high

  • Unknown

Code Executed Via Office Add-in XLL File

Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system. Office add-ins can be used to add functionality to Office programs

Rule ID

powershell_scriptblock_108

Query

{'selection': {'ScriptBlockText|contains|all': ['new-object ', '-ComObject ', '.application', '.RegisterXLL']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,36fbec91-fa1b-4d5d-8df1-8d8edcb632ad

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1137.006

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/28 high

  • Unknown

PSAsyncShell - Asynchronous TCP Reverse Shell

Detects the use of PSAsyncShell an Asynchronous TCP Reverse Shell written in powershell

Rule ID

powershell_scriptblock_109

Query

{'selection': {'ScriptBlockText|contains': 'PSAsyncShell'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,afd3df04-948d-46f6-ae44-25966c44b97f

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/10/04 high

  • Unlikely

Recon Information for Export with PowerShell

Once established within a system or network, an adversary may use automated techniques for collecting internal data

Rule ID

powershell_scriptblock_110

Query

{'selection_action': {'ScriptBlockText|contains': ['Get-Service ', 'Get-ChildItem ', 'Get-Process ']}, 'selection_redirect': {'ScriptBlockText|contains': '> $env:TEMP\\'}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,a9723fcc-881c-424c-8709-fd61442ab3c3

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1119

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/07/30 medium

  • Unknown

Enable Windows Remote Management

Adversaries may use Valid Accounts to interact with remote systems using Windows Remote Management (WinRM). The adversary may then perform actions as the logged-on user.

Rule ID

powershell_scriptblock_111

Query

{'selection_cmdlet': {'ScriptBlockText|contains': 'Enable-PSRemoting '}, 'condition': 'selection_cmdlet'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,991a9744-f2f0-44f2-bd33-9092eba17dc3

Author: frack113

Tactics, Techniques, and Procedures

T1021.006, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/07 medium

  • Legitimate script

Enumerate Credentials from Windows Credential Manager With PowerShell

Adversaries may search for common password storage locations to obtain user credentials. Passwords are stored in several places on a system, depending on the operating system or application holding the credentials.

Rule ID

powershell_scriptblock_112

Query

{'selection_cmd': {'ScriptBlockText|contains|all': ['vaultcmd', '/listcreds:']}, 'selection_option': {'ScriptBlockText|contains': ['Windows Credentials', 'Web Credentials']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,603c6630-5225-49c1-8047-26c964553e0e

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1555

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/20 medium

  • Unknown

Potential Persistence Via Security Descriptors - ScriptBlock

Detects usage of certain functions and keywords that are used to manipulate security descriptors in order to potentially set a backdoor. As seen used in the DAMP project.

Rule ID

powershell_scriptblock_114

Query

{'selection': {'ScriptBlockText|contains|all': ['win32_Trustee', 'win32_Ace', '.AccessMask', '.AceType', '.SetSecurityDescriptor'], 'ScriptBlockText|contains': ['\\Lsa\\JD', '\\Lsa\\Skew1', '\\Lsa\\Data', '\\Lsa\\GBG']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,2f77047c-e6e9-4c11-b088-a3de399524cd

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/05 high

  • Unknown

PowerShell Script with Encryption/Decryption Capabilities

Identifies the use of Cmdlets and methods related to encryption/decryption of files in PowerShell scripts, which malware and offensive security tools can abuse to encrypt data or decrypt payloads to bypass security solutions.

Rule ID

powershell_scriptblock_115

Query

{'selection1': {'ScriptBlockText|contains': 'Cryptography.AESManaged'}, 'selection2': {'ScriptBlockText|contains': 'Cryptography.RijndaelManaged'}, 'selection3': {'ScriptBlockText|contains': 'Cryptography.SHA1Managed'}, 'selection4': {'ScriptBlockText|contains': 'Cryptography.SHA256Managed'}, 'selection5': {'ScriptBlockText|contains': 'Cryptography.SHA384Managed'}, 'selection6': {'ScriptBlockText|contains': 'Cryptography.SHA512Managed'}, 'selection7': {'ScriptBlockText|contains': 'Cryptography.SymmetricAlgorithm'}, 'selection8': {'ScriptBlockText|contains': 'PasswordDeriveBytes'}, 'selection9': {'ScriptBlockText|contains': 'Rfc2898DeriveBytes'}, 'selection10': {'ScriptBlockText|contains': 'CipherMode'}, 'selection11': {'ScriptBlockText|contains': 'PaddingMode'}, 'selection12': {'ScriptBlockText|contains': '.CreateEncryptor'}, 'selection13': {'ScriptBlockText|contains': '.CreateDecryptor'}, 'selection14': {'UserId': 'S-1-5-18'}, 'condition': '(selection1 or selection2 or selection3 or selection4 or selection5 or selection6 or selection7 or selection8 or selection9) and selection10 and selection11 and (selection12 or selection13) and (not selection14)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0005, T1027, T1059.001, T1140

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2023/01/23 medium

  • Legitimate PowerShell Scripts which makes use of encryption.

Suspicious SSL Connection

Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol.

Rule ID

powershell_scriptblock_116

Query

{'selection': {'ScriptBlockText|contains|all': ['System.Net.Security.SslStream', 'Net.Security.RemoteCertificateValidationCallback', '.AuthenticateAsClient']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,195626f3-5f1b-4403-93b7-e6cfd4d6a078

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1573

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/23 low

  • Legitimate administrative script

Potential Keylogger Activity

Detects PowerShell scripts that contains reference to keystroke capturing functions

Rule ID

powershell_scriptblock_117

Query

{'selection': {'ScriptBlockText|contains': '[Windows.Input.Keyboard]::IsKeyDown([System.Windows.Input.Key]::'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,965e2db9-eddb-4cf6-a986-7a967df651e4

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1056.001, T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/04 medium

  • Unknown

Invoke-Obfuscation Via Use Clip - Powershell

Detects Obfuscated Powershell via use Clip.exe in Scripts

Rule ID

powershell_scriptblock_118

Query

{'selection_4104': {'ScriptBlockText|re': '(?i).*?echo.*clip.*&&.*(Clipboard|i`?n`?v`?o`?k`?e`?).*'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,db92dd33-a3ad-49cf-8c2c-608c3e30ace0

Author: Nikita Nazarov, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/09 high

  • Unknown

Execution via CL_Mutexverifiers.ps1

Detects Execution via runAfterCancelProcess in CL_Mutexverifiers.ps1 module

Rule ID

powershell_scriptblock_119

Query

{'selection': {'ScriptBlockText|contains|all': ['CL_Mutexverifiers.ps1', 'runAfterCancelProcess']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,39776c99-1c7b-4ba0-b5aa-641525eee1a4

Author: oscd.community, Natalia Shornikova

Tactics, Techniques, and Procedures

T1059.001, T1216

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2020/10/14 high

  • Unknown

Bloodhound Hack Tool Usage via PowerShell

Detects the usage of PowerShell to execute Bloodhound hacktool on endpoint

Rule ID

powershell_scriptblock_120

Query

{'selection': {'ScriptBlockText|contains': ['Invoke-BloodHound', 'Invoke-AzureHound', 'Get-BloodHoundData']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1482

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2023/03/30 high

  • Unknown

Suspicious X509Enrollment - Ps Script

Detect use of X509Enrollment

Rule ID

powershell_scriptblock_121

Query

{'selection': {'ScriptBlockText|contains': ['X509Enrollment.CBinaryConverter', '884e2002-217d-11da-b2a4-000e7bbb2b09']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,504d63cb-0dba-4d02-8531-e72981aace2c

Author: frack113

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/12/23 medium

  • Legitimate administrative script

Add New Windows Capability - ScriptBlock

Detects usage of the "Add-WindowsCapability" cmdlet to add new windows capabilities. Notable capabilities could be "OpenSSH" and others.

Rule ID

powershell_scriptblock_122

Query

{'selection_cmdlet': {'ScriptBlockText|contains': 'Add-WindowsCapability '}, 'selection_capa': {'ScriptBlockText|contains': 'OpenSSH.'}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,155c7fd5-47b4-49b2-bbeb-eb4fab335429

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2023/01/22 medium

  • Legitimate usage of the capabilities by administartors or users. Filter accordingly

Invoke-Obfuscation Via Use Rundll32 - PowerShell

Detects Obfuscated Powershell via use Rundll32 in Scripts

Rule ID

powershell_scriptblock_123

Query

{'selection_4104': {'ScriptBlockText|contains|all': ['&&', 'rundll32', 'shell32.dll', 'shellexec_rundll'], 'ScriptBlockText|contains': ['value', 'invoke', 'comspec', 'iex']}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,a5a30a6e-75ca-4233-8b8c-42e0f2037d3b

Author: Nikita Nazarov, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2019/10/08 high

  • Unknown

Anti-VM check with WMI Query

WMI Queries allow to inspect Windows properties like the BIOS features. This technique is used by malware to identify virtual and sandboxed host machines, in order to evade security analysis.

Rule ID

powershell_scriptblock_124

Query

{'selection1': {'ScriptBlockText|contains': '-query'}, 'selection2': {'ScriptBlockText|re': '.*(Get-WMIObject|gwmi) .*?-query .*? win32_(BIOS|SystemBIOS).*?(bochs|qemu|VBOX|VirtualBox|VM).*'}, 'condition': 'selection1 and selection2'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/05/01 medium N/A

Suspicious Connection to Remote Account

Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts. Without knowledge of the password for an account, an adversary may opt to systematically guess the password using a repetitive or iterative mechanism

Rule ID

powershell_scriptblock_125

Query

{'selection': {'ScriptBlockText|contains': ['System.DirectoryServices.Protocols.LdapDirectoryIdentifier', 'System.Net.NetworkCredential', 'System.DirectoryServices.Protocols.LdapConnection']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,1883444f-084b-419b-ac62-e0d0c5b3693f

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1110.001

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/27 low

  • Unknown

Suspicious Export-PfxCertificate

Detects Commandlet that is used to export certificates from the local certificate store and sometimes used by threat actors to steal private keys from compromised machines

Rule ID

powershell_scriptblock_126

Query

{'selection': {'ScriptBlockText|contains': 'Export-PfxCertificate'}, 'filter_moduleexport': {'ScriptBlockText|contains': 'CmdletsToExport = @('}, 'condition': 'selection and not 1 of filter*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,aa7a3fce-bef5-4311-9cc1-5f04bb8c308c

Author: Florian Roth (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1552.004

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/04/23 high

  • Legitimate certificate exports invoked by administrators or users (depends on processes in the environment - filter if unusable)

Powershell Sensitive File Discovery

Detect adversaries enumerate sensitive files

Rule ID

powershell_scriptblock_127

Query

{'selection_action': {'ScriptBlockText|contains': ['ls', 'get-childitem', 'gci']}, 'selection_recurse': {'ScriptBlockText|contains': '-recurse'}, 'selection_file': {'ScriptBlockText|contains': ['.pass', '.kdbx', '.kdb']}, 'condition': 'all of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,7d416556-6502-45b2-9bad-9d2f05f38997

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1083

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/09/16 medium

  • Unknown

Invoke-Obfuscation VAR++ LAUNCHER OBFUSCATION - PowerShell

Detects Obfuscated Powershell via VAR++ LAUNCHER

Rule ID

powershell_scriptblock_128

Query

{'selection_4104': {'ScriptBlockText|re': '(?i).*&&set.*(\\{\\d\\}){2,}\\\\"\\s+?-f.*&&.*cmd.*/c'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,e54f5149-6ba3-49cf-b153-070d24679126

Author: Timur Zinniatullin, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/13 high

  • Unknown

Testing Usage of Uncommonly Used Port

Adversaries may communicate using a protocol and port paring that are typically not associated. For example, HTTPS over port 8088(Citation: Symantec Elfin Mar 2019) or port 587(Citation: Fortinet Agent Tesla April 2018) as opposed to the traditional port 443.

Rule ID

powershell_scriptblock_129

Query

{'selection': {'ScriptBlockText|contains|all': ['Test-NetConnection', '-ComputerName ', '-port ']}, 'filter': {'ScriptBlockText|contains': [' 443 ', ' 80 ']}, 'condition': 'selection and not filter'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,adf876b3-f1f8-4aa9-a4e4-a64106feec06

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1571

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/01/23 medium

  • Legitimate administrative script

Troubleshooting Pack Cmdlet Execution

Detects execution of "TroubleshootingPack" cmdlets to leverage CVE-2022-30190 or action similar to "msdt" lolbin (as described in LOLBAS)

Rule ID

powershell_scriptblock_130

Query

{'selection': {'ScriptBlockText|contains|all': ['Invoke-TroubleshootingPack', 'C:\\Windows\\Diagnostics\\System\\PCW', '-AnswerFile', '-Unattended']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,03409c93-a7c7-49ba-9a4c-a00badf2a153

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001, T1202

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/06/21 medium

  • Legitimate usage of "TroubleshootingPack" cmdlet for troubleshooting purposes

Invoke-Obfuscation Via Stdin - Powershell

Detects Obfuscated Powershell via Stdin in Scripts

Rule ID

powershell_scriptblock_131

Query

{'selection_4104': {'ScriptBlockText|re': '(?i).*(set).*&&\\s?set.*(environment|invoke|\\$\\{?input).*&&.*"'}, 'condition': 'selection_4104'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,86b896ba-ffa1-4fea-83e3-ee28a4c915c7

Author: Nikita Nazarov, oscd.community

Tactics, Techniques, and Procedures

T1027, T1059.001, T1059.001

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2020/10/12 high

  • Unknown

Suspicious Mount-DiskImage

Adversaries may abuse container files such as disk image (.iso, .vhd) file formats to deliver malicious payloads that may not be tagged with MOTW.

Rule ID

powershell_scriptblock_132

Query

{'selection': {'ScriptBlockText|contains|all': ['Mount-DiskImage ', '-ImagePath ']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,29e1c216-6408-489d-8a06-ee9d151ef819

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1553.005

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/02/01 low

  • Legitimate PowerShell scripts

Suspicious PowerShell Mailbox Export to Share - PS

Detects usage of the powerShell New-MailboxExportRequest Cmdlet to exports a mailbox to a remote or local share, as used in ProxyShell exploitations

Rule ID

powershell_scriptblock_133

Query

{'selection': {'ScriptBlockText|contains|all': ['New-MailboxExportRequest', ' -Mailbox ', ' -FilePath \\\\']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,4a241dea-235b-4a7e-8d76-50d817b146c4

Author: Nasreddine Bencherchali (Nextron Systems)

Tactics, Techniques, and Procedures

T1059.001

References

Severity

95

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2022/10/26 critical

  • Unknown

Data Compressed - PowerShell

An adversary may compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network.

Rule ID

powershell_scriptblock_134

Query

{'selection': {'ScriptBlockText|contains|all': ['-Recurse', '|', 'Compress-Archive']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,6dc5d284-69ea-42cf-9311-fb1c3932a69a

Author: Timur Zinniatullin, oscd.community

Tactics, Techniques, and Procedures

T1059.001, T1560

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2019/10/21 low

  • Highly likely if archive operations are done via PowerShell.

PowerShell Create Local User

Detects creation of a local user via PowerShell

Rule ID

powershell_scriptblock_135

Query

{'selection': {'ScriptBlockText|contains': 'New-LocalUser'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,243de76f-4725-4f2e-8225-a8a69b15ad61

Author: @ROxPinTeddy

Tactics, Techniques, and Procedures

T1059.001, T1059.001, T1136.001

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2020/04/11 medium

  • Legitimate user creation

WMI lateral movement using MSI package

Windows Management Instrumentation (WMI) is able to install MSI packages in remote computers. An attacker can use it to performa lateral movement and execute malicious code.

Rule ID

powershell_scriptblock_136

Query

{'selection1': {'ScriptBlockText|contains': 'win32_product'}, 'selection2': {'ScriptBlockText|contains': 'install'}, 'selection3': {'ScriptBlockText|contains': '-ComputerName'}, 'selection4': {'ScriptBlockText|contains': '-Credential'}, 'condition': 'selection1 and selection2 and selection3 and selection4'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1059.001

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2022/05/01 medium N/A

Replace Desktop Wallpaper by Powershell

An adversary may deface systems internal to an organization in an attempt to intimidate or mislead users. This may take the form of modifications to internal websites, or directly to user systems with the replacement of the desktop wallpaper

Rule ID

powershell_scriptblock_137

Query

{'selection_1': {'ScriptBlockText|contains|all': ['Get-ItemProperty', 'Registry::', 'HKEY_CURRENT_USER\\Control Panel\\Desktop\\', 'WallPaper']}, 'selection_2': {'ScriptBlockText|contains': 'SystemParametersInfo(20,0,*,3)'}, 'condition': '1 of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,c5ac6a1e-9407-45f5-a0ce-ca9a0806a287

Author: frack113

Tactics, Techniques, and Procedures

T1059.001, T1491.001

References

Severity

24

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/12/26 low

  • Unknown

PowerShell MiniDump Script

This rule detects PowerShell scripts capable of dumping process memory using WindowsErrorReporting or Dbghelp.dll MiniDumpWriteDump. Attackers can use this tooling to dump LSASS and get access to credentials.

Rule ID

powershell_scriptblock_138

Query

{'selection1': {'ScriptBlockText|contains': ['MiniDumpWriteDump', 'MiniDumpWithFullMemory', 'pmuDetirWpmuDiniM']}, 'selection2': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (not selection2)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, TA0006, T1003, T1059, T1059.001

References

N/A

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/05 high

  • PowerShell scripts that use this capability for troubleshooting.

PowerShell PSReflect Script

Detects the use of PSReflect in PowerShell scripts. Attackers leverage PSReflect as a library that enables PowerShell to access win32 API functions.

Rule ID

powershell_scriptblock_139

Query

{'selection1': {'ScriptBlockText|contains': ['New-InMemoryModule', 'Add-Win32Type', 'psenum', 'DefineDynamicAssembly', 'DefineDynamicModule', 'Reflection.TypeAttributes', 'Reflection.Emit.OpCodes', 'Reflection.Emit.CustomAttributeBuilder', 'Runtime.InteropServices.DllImportAttribute']}, 'selection2': {'UserId': 'S-1-5-18'}, 'condition': 'selection1 and (not selection2)'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0002, T1059, T1059.001, T1106

References

N/A

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2021/10/15 medium

  • Legitimate PowerShell scripts that make use of PSReflect to access the win32 API

Winlogon Helper DLL

Winlogon.exe is a Windows component responsible for actions at logon/logoff as well as the secure attention sequence (SAS) triggered by Ctrl-Alt-Delete. Registry entries in HKLM\Software[Wow6432Node]Microsoft\Windows NT\CurrentVersion\Winlogon\ and HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\ are used to manage additional helper programs and functionalities that support Winlogon. Malicious modifications to these Registry keys may cause Winlogon to load and execute malicious DLLs and/or executables.

Rule ID

powershell_scriptblock_140

Query

{'selection': {'ScriptBlockText|contains': 'CurrentVersion\\Winlogon'}, 'selection2': {'ScriptBlockText|contains': ['Set-ItemProperty', 'New-Item']}, 'condition': 'all of selection*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

SigmaHQ,851c506b-6b7c-4ce2-8802-c703009d03c0

Author: Timur Zinniatullin, oscd.community

Tactics, Techniques, and Procedures

T1059.001, T1547.004

References

Severity

49

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
experimental 2019/10/21 medium

  • Unknown

Code Executed Via Office Add-in

Adversaries may abuse Microsoft Office add-ins to obtain persistence on a compromised system. Office add-ins can be used to add functionality to Office programs.

Rule ID

powershell_scriptblock_147

Query

{'selection_xll': {'ScriptBlockText|contains|all': ['Copy', '\\Microsoft\\AddIns\\', '.xll']}, 'selection_wll': {'ScriptBlockText|contains|all': ['Copy', '\\Microsoft\\Word\\Startup\\', '.wll']}, 'selection_xlam': {'ScriptBlockText|contains|all': ['Copy', '\\Microsoft\\Excel\\XLSTART\\', '.xlam']}, 'selection_ppam': {'ScriptBlockText|contains|all': ['Copy', '\\Microsoft\\Addins\\', '.ppam']}, 'condition': '1 of selection_*'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Monitoring PowerShell scripts

  • Requirements: Script Block Logging must be enabled

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

T1059.001, T1137.006

References

Severity

74

Suppression Logic Based On

  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2024/01/26 high

  • Unknown