Detectionmediumtest

Azure Active Directory Hybrid Health AD FS Service Delete

This detection uses azureactivity logs (Administrative category) to identify the deletion of an Azure AD Hybrid health AD FS service instance in a tenant. A threat actor can create a new AD Health ADFS service and create a fake server to spoof AD FS signing logs. The health AD FS service can then be deleted after it is not longer needed via HTTP requests to Azure.

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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 1148739819-8230-4ee3-a8ea-e0289d1fb0ffcloud

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/delete'
    condition: selection