Azure Suppression Rule Created

Description

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

Query · sigma

selection:
  operationName: MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE
condition: selection

Known false positives

  • 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.
Raw source Azure Suppression Rule Created · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Azure Suppression Rule Created
id: 92cc3e5d-eb57-419d-8c16-5c63f325a401
status: test
description: Identifies when a suppression rule is created in Azure. Adversary's could attempt this to evade detection.
references:
    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
author: Austin Songer
date: 2021-08-16
modified: 2022-08-23
tags:
    - attack.impact
logsource:
    product: azure
    service: activitylogs
detection:
    selection:
        operationName: MICROSOFT.SECURITY/ALERTSSUPPRESSIONRULES/WRITE
    condition: selection
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.
level: medium

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