Rules Contributing to Suspicious Windows Active Directory Operation Alerts

The following rules are used to identify suspicious activity with Windows Active Directory operation. Any one or more of these will trigger Suspicious Windows Active Directory Operation Alert. Details for each rule can be viewed by clicking the More Details link in the description.

Title

Description

DPAPI Domain Backup Key Extraction

Detects tools extracting LSA secret DPAPI domain backup key from Domain Controllers

Rule ID

windows_security_37

Query

{'selection': {'EventID': 4662, 'ObjectType': 'SecretObject', 'AccessMask': '0x2', 'ObjectName|contains': 'BCKUPKEY'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Collecting Windows security events

Rule Source

SigmaHQ,4ac1f50b-3bd0-4968-902d-868b4647937e

Author: Roberto Rodriguez @Cyb3rWard0g

Tactics, Techniques, and Procedures

T1003.004

References

Severity

75

Suppression Logic Based On

  • event_id
  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2019/06/20 high

  • Unknown

WMI Persistence - Security

Detects suspicious WMI event filter and command line event consumer based on WMI and Security Logs.

Rule ID

windows_security_60

Query

{'selection': {'EventID': 4662, 'ObjectType': 'WMI Namespace', 'ObjectName|contains': 'subscription'}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Collecting Windows security events

Rule Source

SigmaHQ,f033f3f3-fd24-4995-97d8-a3bb17550a88

Author: Florian Roth (Nextron Systems), Gleb Sukhodolskiy, Timur Zinniatullin oscd.community

Tactics, Techniques, and Procedures

T1546.003

References

Severity

50

Suppression Logic Based On

  • event_id
  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2017/08/22 medium

  • Unknown (data set is too small; further testing needed)

AD Object WriteDAC Access

Detects WRITE_DAC access to a domain object

Rule ID

windows_security_77

Query

{'selection': {'EventID': 4662, 'ObjectServer': 'DS', 'AccessMask': '0x40000', 'ObjectType': ['19195a5b-6da0-11d0-afd3-00c04fd930c9', 'domainDNS']}, 'condition': 'selection'}

Log Source

Stellar Cyber Windows Server Sensor configured for:

  • Collecting Windows security events

Rule Source

SigmaHQ,028c7842-4243-41cd-be6f-12f3cf1a26c7

Author: Roberto Rodriguez @Cyb3rWard0g

Tactics, Techniques, and Procedures

T1222.001

References

Severity

90

Suppression Logic Based On

  • event_id
  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2019/09/12 critical

  • Unknown

Access to a Sensitive LDAP Attribute

Identify access to sensitive Active Directory object attributes that contains credentials and decryption keys such as unixUserPassword, ms-PKI-AccountCredentials and msPKI-CredentialRoamingTokens.

Rule ID

windows_security_81

Query

{'selection1': {'EventID': 4662}, 'selection2': {'SubjectUserSid': 'S-1-5-18'}, 'selection3': {'Properties': ['*612cb747-c0e8-4f92-9221-fdd5f15b550d*', '*b8dfa744-31dc-4ef1-ac7c-84baf7ef9da7*', '*b3f93023-9239-4f7c-b99c-6745d87adbc2*', '*b7ff5a38-0818-42b0-8110-d3d154c97f24*']}, 'selection4': {'AccessMask': ['0x0', '0x100']}, 'condition': 'selection1 and (not selection2) and selection3 and (not selection4)'}

Log Source

Stellar Cyber Windows Server Sensor configured.

Rule Source

Developed internally by Stellar Cyber

Tactics, Techniques, and Procedures

TA0006, T1003

References

N/A

Severity

50

Suppression Logic Based On

  • event_id
  • computer_name
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
production 2022/11/09 medium N/A