SysKey Registry Keys Access — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez @Cyb3rWard0g. Source status: test; severity: high. Source dates: 2019-08-12 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 5176345ccd04a0815caf347f9fd1583b91444ae940174404ddf46bc3d66b66a8

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: SysKey Registry Keys Access
id: 9a4ff3b8-6187-4fd2-8e8b-e0eae1129495
status: test
description: Detects handle requests and access operations to specific registry keys to calculate the SysKey
references:
    - https://threathunterplaybook.com/hunts/windows/190625-RegKeyAccessSyskey/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-08-12
modified: 2021-11-27
tags:
    - attack.discovery
    - attack.t1012
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 4656
            - 4663
        ObjectType: 'key'
        ObjectName|endswith:
            - 'lsa\JD'
            - 'lsa\GBG'
            - 'lsa\Skew1'
            - 'lsa\Data'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://threathunterplaybook.com/hunts/windows/190625-RegKeyAccessSyskey/notebook.html