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Microsoft Entra ID Health Service Agents Registry Keys Access

This detection uses Windows security events to detect suspicious access attempts to the registry key values and sub-keys of Microsoft Entra ID Health service agents (e.g AD FS). Information from AD Health service…

Description

This detection uses Windows security events to detect suspicious access attempts to the registry key values and sub-keys of Microsoft Entra ID Health service agents (e.g AD FS). Information from AD Health service agents can be used to potentially abuse some of the features provided by those services in the cloud (e.g. Federation). This detection requires an access control entry (ACE) on the system access control list (SACL) of the following securable object: HKLM:\SOFTWARE\Microsoft\ADHealthAgent. Make sure you set the SACL to propagate to its sub-keys. You can find more information in here https://github.com/OTRF/Set-AuditRule/blob/master/rules/registry/aad_connect_health_service_agent.yml

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
securityeventswindowsforwardedeventswindowssecurityevents
Log source service
securityeventsecurityeventswindowsevent

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