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Azure Frontdoor Web Application Firewall (WAF) Policy Deletededit

Identifies the deletion of a Frontdoor Web Application Firewall (WAF) Policy in Azure. An adversary may delete a Frontdoor Web Application Firewall (WAF) Policy in an attempt to evade defenses and/or to eliminate barriers in carrying out their initiative.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-azure*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-25m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Cloud
  • Azure
  • Continuous Monitoring
  • SecOps
  • Network Security

Version: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positivesedit

Azure Front Web Application Firewall (WAF) Policy deletions may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Azure Front Web Application Firewall (WAF) Policy deletions from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guideedit

## Config

The Azure Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule queryedit

event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:"MICROSOFT.NETWORK/FRONTDOORWEBAPPLICATIONFIREWALLPOLICIES/DELETE"
and event.outcome:(Success or success)

Threat mappingedit

Framework: MITRE ATT&CKTM

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