Azure Kubernetes Network Policy Change

Identifies when a Azure Kubernetes network policy is modified or deleted.

Sigma rule (View on GitHub)

 1title: Azure Kubernetes Network Policy Change
 2id: 08d6ac24-c927-4469-b3b7-2e422d6e3c43
 3status: test
 4description: Identifies when a Azure Kubernetes network policy is modified or deleted.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes
 7    - https://www.microsoft.com/security/blog/2021/03/23/secure-containerized-environments-with-updated-threat-matrix-for-kubernetes/
 8    - https://www.microsoft.com/security/blog/2020/04/02/attack-matrix-kubernetes/
 9    - https://medium.com/mitre-engenuity/att-ck-for-containers-now-available-4c2359654bf1
10    - https://attack.mitre.org/matrices/enterprise/cloud/
11author: Austin Songer @austinsonger
12date: 2021/08/07
13modified: 2022/08/23
14tags:
15    - attack.impact
16    - attack.credential_access
17logsource:
18    product: azure
19    service: activitylogs
20detection:
21    selection:
22        operationName:
23            - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/NETWORKING.K8S.IO/NETWORKPOLICIES/WRITE
24            - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/NETWORKING.K8S.IO/NETWORKPOLICIES/DELETE
25            - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EXTENSIONS/NETWORKPOLICIES/WRITE
26            - MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EXTENSIONS/NETWORKPOLICIES/DELETE
27    condition: selection
28falsepositives:
29    - Network Policy being modified and 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.
30    - Network Policy being modified and deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
31level: medium

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