Azure Network Firewall Policy Modified or Deleted

Identifies when a Firewall Policy is Modified or Deleted.

Sigma rule (View on GitHub)

 1title: Azure Network Firewall Policy Modified or Deleted
 2id: 83c17918-746e-4bd9-920b-8e098bf88c23
 3status: test
 4description: Identifies when a Firewall Policy is Modified or Deleted.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
 7author: Austin Songer @austinsonger
 8date: 2021/09/02
 9modified: 2022/08/23
10tags:
11    - attack.impact
12    - attack.defense_evasion
13    - attack.t1562.007
14logsource:
15    product: azure
16    service: activitylogs
17detection:
18    selection:
19        operationName:
20            - MICROSOFT.NETWORK/FIREWALLPOLICIES/WRITE
21            - MICROSOFT.NETWORK/FIREWALLPOLICIES/JOIN/ACTION
22            - MICROSOFT.NETWORK/FIREWALLPOLICIES/CERTIFICATES/ACTION
23            - MICROSOFT.NETWORK/FIREWALLPOLICIES/DELETE
24    condition: selection
25falsepositives:
26    - Firewall Policy 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.
27    - Firewall Policy modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
28level: medium

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