Azure Application Gateway Modified or Deleted via Activity Logs

title: Azure Application Gateway Modified or Deleted via Activity Logs
id: bd65ae05-3bf4-4be7-8046-84cf8b25b08f
status: test
description: This rule flags Azure Activity Log events where an Application Gateway is modified or deleted. Such changes can indicate malicious intent to disrupt traffic, alter configurations, or remove the gateway entirely. Detection relies on Activity Logs operation names for Application Gateway write and delete actions. Investigations should focus on the initiating identity and context around the change.
references:
  - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
  - https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/azure/activity_logs/azure_application_gateway_modified_or_deleted.yml
author: Austin Songer, Huntrule Team
date: 2021-08-16
modified: 2022-08-23
tags:
  - attack.impact
logsource:
  product: azure
  service: activitylogs
detection:
  selection:
    operationName:
      - MICROSOFT.NETWORK/APPLICATIONGATEWAYS/WRITE
      - MICROSOFT.NETWORK/APPLICATIONGATEWAYS/DELETE
  condition: selection
falsepositives:
  - Application gateway 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.
  - Application gateway 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
license: DRL-1.1
related:
  - id: ad87d14e-7599-4633-ba81-aeb60cfe8cd6
    type: derived