Detectionmediumtest

Azure Active Directory Hybrid Health AD FS New Server

This detection uses azureactivity logs (Administrative category) to identify the creation or update of a server instance in an Azure AD Hybrid health AD FS service. A threat actor can create a new AD Health ADFS service and create a fake server instance to spoof AD FS signing logs. There is no need to compromise an on-prem AD FS server. This can be done programmatically via HTTP requests to Azure.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTICCreated Thu Aug 26Updated Wed Oct 11288a39fc-4914-4831-9ada-270e9dc12cb4cloud

Log Source

Azureactivitylogs

ProductAzure← raw: azure

Serviceactivitylogs← raw: activitylogs

Detection Logic

detection:
    selection:
        CategoryValue: 'Administrative'
        ResourceProviderValue: 'Microsoft.ADHybridHealthService'
        ResourceId|contains: 'AdFederationService'
        OperationNameValue: 'Microsoft.ADHybridHealthService/services/servicemembers/action'
    condition: selection