Mimikatz DC Sync — Sigma Rule

Rule metadata and linked tags

Author: Benjamin Delpy, Florian Roth (Nextron Systems), Scott Dermott, Sorina Ionescu. Source status: test; severity: high. Source dates: 2018-06-03 / 2022-04-26.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6fbd088349d033ced12675320c6f84bd36d7caba741a9fb19a6bea3390ddf175

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: Mimikatz DC Sync
id: 611eab06-a145-4dfa-a295-3ccc5c20f59a
status: test
description: Detects Mimikatz DC sync security events
references:
    - https://twitter.com/gentilkiwi/status/1003236624925413376
    - https://gist.github.com/gentilkiwi/dcc132457408cf11ad2061340dcb53c2
    - https://blog.blacklanternsecurity.com/p/detecting-dcsync?s=r
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4662
author: Benjamin Delpy, Florian Roth (Nextron Systems), Scott Dermott, Sorina Ionescu
date: 2018-06-03
modified: 2022-04-26
tags:
    - attack.credential-access
    - attack.s0002
    - attack.t1003.006
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4662
        Properties|contains:
            - 'Replicating Directory Changes All'
            - '1131f6ad-9c07-11d1-f79f-00c04fc2dcd2'
            - '1131f6aa-9c07-11d1-f79f-00c04fc2dcd2'
            - '9923a32a-3607-11d2-b9be-0000f87a36b2'
            - '89e95b76-444d-4c62-991a-0facbeda640c'
        AccessMask: '0x100'
    filter1:
        SubjectDomainName: 'Window Manager'
    filter2:
        SubjectUserName|startswith:
            - 'NT AUT'
            - 'MSOL_'
    filter3:
        SubjectUserName|endswith: '$'
    condition: selection and not 1 of filter*
falsepositives:
    - Valid DC Sync that is not covered by the filters; please report
    - Local Domain Admin account used for Azure AD Connect
level: high

Original YAML and metadata in JSON

False positives

• Valid DC Sync that is not covered by the filters; please report
• Local Domain Admin account used for Azure AD Connect

Source references

• https://twitter.com/gentilkiwi/status/1003236624925413376
• https://gist.github.com/gentilkiwi/dcc132457408cf11ad2061340dcb53c2
• https://blog.blacklanternsecurity.com/p/detecting-dcsync?s=r
• https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4662