Azure Kubernetes Service Account Modified or Deleted

Title: Azure Kubernetes Service Account Modified or Deleted
Status: test
Description:Identifies when a service account is modified or deleted.
References:
  -https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes
  -https://www.microsoft.com/security/blog/2021/03/23/secure-containerized-environments-with-updated-threat-matrix-for-kubernetes/
  -https://www.microsoft.com/security/blog/2020/04/02/attack-matrix-kubernetes/
  -https://medium.com/mitre-engenuity/att-ck-for-containers-now-available-4c2359654bf1
Author: Austin Songer @austinsonger
Date: 2021-08-07
modified:2022-08-23
Tags:

• -'attack.impact'
• -'attack.t1531'
• -'attack.t1485'
• -'attack.t1496'
• -'attack.t1489'

Logsource:

• product: azure
• service: activitylogs

Detection:
  selection:
    operationName:
      -'MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/SERVICEACCOUNTS/WRITE'
      -'MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/SERVICEACCOUNTS/DELETE'
      -'MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/SERVICEACCOUNTS/IMPERSONATE/ACTION'

  condition:selection
Falsepositives:
  -Service account being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
  -Service account modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
Level: medium