Rules Contributing to Suspicious Azure Kubernetes Activity: Persistence Alert

The following rules are used to identify suspicious Azure Kubernetes activity usually in the persistence stage. Any one or more of these will trigger the Suspicious Azure Kubernetes Activity: Persistence Alert. Details for each rule can be viewed by clicking the More Details link in the description.

Title

Description

Azure Kubernetes CronJob

Identifies when a Azure Kubernetes CronJob runs in Azure Cloud. Kubernetes Job is a controller that creates one or more pods and ensures that a specified number of them successfully terminate. Kubernetes Job can be used to run containers that perform finite tasks for batch jobs. Kubernetes CronJob is used to schedule Jobs. An Adversary may use Kubernetes CronJob for scheduling execution of malicious code that would run as a container in the cluster.

Rule ID

azure_62

Query

{'selection': {'operationName|startswith': ['MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/BATCH', 'MICROSOFT.CONTAINERSERVICE/MANAGEDCLUSTERS/BATCH'], 'operationName|endswith': ['/CRONJOBS/WRITE', '/JOBS/WRITE']}, 'condition': 'selection'}

Log Source

Stellar Cyber Microsoft Entra Events configured.

Rule Source

SigmaHQ,1c71e254-6655-42c1-b2d6-5e4718d7fc0a

Author: Austin Songer @austinsonger

Tactics, Techniques, and Procedures

PERSISTENCE, T1053.007

References

Severity

50

Suppression Logic Based On

  • azure_activity_log.resourceId
  • azure_activity_log.operationName
  • stellar.rule_id

Additional Information

Maturity Creation Date Risk Level False Positives
test 2021/11/22 medium

  • Azure Kubernetes CronJob/Job may be done by a system administrator.

  • If known behavior is causing false positives, it can be exempted from the rule.