Azure Firewall Rule Collection Modified or Deleted

Description

Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.

Query · sigma

selection:
  operationName:
  - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/WRITE
  - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/DELETE
  - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/WRITE
  - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/DELETE
  - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/WRITE
  - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/DELETE
condition: selection

Known false positives

  • Rule Collections (Application, NAT, and Network) 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.
  • Rule Collections (Application, NAT, and Network) modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
Raw source Azure Firewall Rule Collection Modified or Deleted · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Azure Firewall Rule Collection Modified or Deleted
id: 025c9fe7-db72-49f9-af0d-31341dd7dd57
status: test
description: Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.
references:
    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
author: Austin Songer @austinsonger
date: 2021-08-08
modified: 2022-08-23
tags:
    - attack.impact
    - attack.defense-impairment
    - attack.t1686.001
logsource:
    product: azure
    service: activitylogs
detection:
    selection:
        operationName:
            - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/WRITE
            - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/DELETE
            - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/WRITE
            - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/DELETE
            - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/WRITE
            - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/DELETE
    condition: selection
falsepositives:
    - Rule Collections (Application, NAT, and Network) 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.
    - Rule Collections (Application, NAT, and Network) modified or deleted 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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