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Detectionmediumtest

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.

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Launch
Austin SongerCreated Mon Nov 22Updated Sun Dec 181c71e254-6655-42c1-b2d6-5e4718d7fc0acloud
Log Source
Azureactivitylogs
ProductAzure← raw: azure
Serviceactivitylogs← raw: activitylogs
Detection Logic
Detection Logic1 selector
detection:
    selection:
        operationName|startswith:
            - 'MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/BATCH'
            - 'MICROSOFT.CONTAINERSERVICE/MANAGEDCLUSTERS/BATCH'
        operationName|endswith:
            - '/CRONJOBS/WRITE'
            - '/JOBS/WRITE'
    condition: selection
False Positives

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.

References
1
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learn.microsoft.com
2
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kubernetes.io
3
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kubernetes.io
4
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microsoft.com
MITRE ATT&CK

Sub-techniques

T1053.003 · Cron
Rule Metadata
Rule ID
1c71e254-6655-42c1-b2d6-5e4718d7fc0a
Status
test
Level
medium
Type
Detection
Created
Mon Nov 22
Modified
Sun Dec 18
Author
Austin Songer
Path
rules/cloud/azure/activity_logs/azure_kubernetes_cronjob.yml
Raw Tags
attack.persistenceattack.t1053.003attack.privilege-escalationattack.execution
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