Azure AD Health Monitoring Agent Registry Keys Access — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC. Source status: test; severity: medium. Source dates: 2021-08-26 / 2022-10-09.

{
  "product": "windows",
  "service": "security"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 62d903a8722813896742b39e5b81065be8638b2a2a189cb0e4847fe875fe6356

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Azure AD Health Monitoring Agent Registry Keys Access
id: ff151c33-45fa-475d-af4f-c2f93571f4fe
status: test
description: |
    This detection uses Windows security events to detect suspicious access attempts to the registry key of Azure AD Health monitoring agent.
    This detection requires an access control entry (ACE) on the system access control list (SACL) of the following securable object HKLM\SOFTWARE\Microsoft\Microsoft Online\Reporting\MonitoringAgent.
references:
    - https://o365blog.com/post/hybridhealthagent/
    - https://github.com/OTRF/Set-AuditRule/blob/c3dec5443414231714d850565d364ca73475ade5/rules/registry/aad_connect_health_monitoring_agent.yml
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research), MSTIC
date: 2021-08-26
modified: 2022-10-09
tags:
    - attack.discovery
    - attack.t1012
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 4656
            - 4663
        ObjectType: 'Key'
        ObjectName: '\REGISTRY\MACHINE\SOFTWARE\Microsoft\Microsoft Online\Reporting\MonitoringAgent'
    filter:
        ProcessName|contains:
            - 'Microsoft.Identity.Health.Adfs.DiagnosticsAgent.exe'
            - 'Microsoft.Identity.Health.Adfs.InsightsService.exe'
            - 'Microsoft.Identity.Health.Adfs.MonitoringAgent.Startup.exe'
            - 'Microsoft.Identity.Health.Adfs.PshSurrogate.exe'
            - 'Microsoft.Identity.Health.Common.Clients.ResourceMonitor.exe'
    condition: selection and not filter
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://o365blog.com/post/hybridhealthagent/
• https://github.com/OTRF/Set-AuditRule/blob/c3dec5443414231714d850565d364ca73475ade5/rules/registry/aad_connect_health_monitoring_agent.yml