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.
Detection logic
selection
CategoryValue: Administrative
ResourceProviderValue: Microsoft.ADHybridHealthService
ResourceId|contains: AdFederationService
OperationNameValue: Microsoft.ADHybridHealthService/services/deleteCondition
selectionRaw YAML
title: Azure Active Directory Hybrid Health AD FS Service Delete
id: 48739819-8230-4ee3-a8ea-e0289d1fb0ff
status: test
description: |
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://o365blog.com/post/hybridhealthagent/
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC
date: 2021-08-26
modified: 2023-10-11
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:
- Legitimate AAD Health AD FS service instances being deleted in a tenant
level: mediumFalse positives
- Legitimate AAD Health AD FS service instances being deleted in a tenant