AD Object WriteDAC Access — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez @Cyb3rWard0g. Source status: test; severity: critical. Source dates: 2019-09-12 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: fa3177abffe702dd3f54db432f1679004599348b437df22ad9c1bfc96f709777

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: AD Object WriteDAC Access
id: 028c7842-4243-41cd-be6f-12f3cf1a26c7
status: test
description: Detects WRITE_DAC access to a domain object
references:
    - https://threathunterplaybook.com/hunts/windows/180815-ADObjectAccessReplication/notebook.html
    - https://threathunterplaybook.com/library/windows/active_directory_replication.html
    - https://threathunterplaybook.com/hunts/windows/190101-ADModDirectoryReplication/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-09-12
modified: 2021-11-27
tags:
    - attack.defense-impairment
    - attack.t1222.001
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4662
        ObjectServer: 'DS'
        AccessMask: '0x40000'
        ObjectType:
            - '19195a5b-6da0-11d0-afd3-00c04fd930c9'
            - 'domainDNS'
    condition: selection
falsepositives:
    - Unknown
level: critical

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://threathunterplaybook.com/hunts/windows/180815-ADObjectAccessReplication/notebook.html
• https://threathunterplaybook.com/library/windows/active_directory_replication.html
• https://threathunterplaybook.com/hunts/windows/190101-ADModDirectoryReplication/notebook.html