Suspicious Azure Active Directory Hybrid Health AD FS Service Delete (via activitylogs)

title: Suspicious Azure Active Directory Hybrid Health AD FS Service Delete (via activitylogs)
id: 6e6ac07a-2a74-5fa7-8371-d3d09862e2cf
status: stable
description: This rule detects 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.
references:
    - https://attack.mitre.org/techniques/T1578/003/
    - https://o365blog.com/post/hybridhealthagent/
author: Huntrule Team
date: 2026-04-02
tags:
    - attack.defense-impairment
    - attack.t1578.003
logsource:
    product: azure
    service: activitylogs
detection:
    selection:
        CategoryValue: 'Administrative'
        ResourceProviderValue: 'Microsoft.ADHybridHealthService'
        ResourceId|contains: 'AdFederationService'
        OperationNameValue: 'Microsoft.ADHybridHealthService/services/delete'
    condition: selection
falsepositives:
    - Unknown
level: medium