title: Azure Suppression Rule Created
id: 92cc3e5d-eb57-419d-8c16-5c63f325a401
description: Identifies when a suppression rule is created in Azure. Adversary's could attempt this to evade detection.
author: Austin Songer
status: experimental
date: 2021/08/16
references:
    - https://docs.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
logsource:
  product: azure
  service: activitylogs
detection:
    selection:
        properties.message: 
            - MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE
    condition: selection
level: medium
tags:
    - attack.impact
falsepositives:
 - Suppression Rule being created may be performed by a system administrator. 
 - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. 
 - Suppression Rule created from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
