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://docs.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
References
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