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Azure Frontdoor WAF Blocked a Request

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Goal

Detect when an Azure Frontdoor Web Application Firewall (WAF) blocks a request from an IP address.

Strategy

This rule monitors Azure Activity logs for Frontdoor Web Application Firewall logs and detects when the @evt.name has a value of Microsoft.Network/FrontDoor/WebApplicationFirewallLog/Write and @properties.action has a value of Block.

Triage and response

  1. Inspect whether this request should have been blocked or not.
  2. Navigate to the IP dashboard and inspect other requests this IP address has made.