Azure Suppression Rule Created

Identifies when a suppression rule is created in Azure. Adversary's could attempt this to evade detection.

Sigma rule (View on GitHub)

 1title: Azure Suppression Rule Created
 2id: 92cc3e5d-eb57-419d-8c16-5c63f325a401
 3status: test
 4description: Identifies when a suppression rule is created in Azure. Adversary's could attempt this to evade detection.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
 7author: Austin Songer
 8date: 2021/08/16
 9modified: 2022/08/23
10tags:
11    - attack.impact
12logsource:
13    product: azure
14    service: activitylogs
15detection:
16    selection:
17        operationName: MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE
18    condition: selection
19falsepositives:
20    - Suppression Rule being created may be performed by a system administrator.
21    - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
22    - Suppression Rule created from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
23level: medium

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