Azure Firewall Rule Collection Modified or Deleted

Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.

Sigma rule (View on GitHub)

 1title: Azure Firewall Rule Collection Modified or Deleted
 2id: 025c9fe7-db72-49f9-af0d-31341dd7dd57
 3status: test
 4description: Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
 7author: Austin Songer @austinsonger
 8date: 2021/08/08
 9modified: 2022/08/23
10tags:
11    - attack.impact
12    - attack.defense_evasion
13    - attack.t1562.004
14logsource:
15    product: azure
16    service: activitylogs
17detection:
18    selection:
19        operationName:
20            - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/WRITE
21            - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/DELETE
22            - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/WRITE
23            - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/DELETE
24            - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/WRITE
25            - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/DELETE
26    condition: selection
27falsepositives:
28    - Rule Collections (Application, NAT, and Network) 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.
29    - Rule Collections (Application, NAT, and Network) modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
30level: medium

References

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