DPAPI Domain Backup Key Extraction — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez @Cyb3rWard0g. Source status: test; severity: high. Source dates: 2019-06-20 / 2022-02-24.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 979fc24597ad145f7d96c64b446f6b1953979df2e4f9183c532936ff453132e5

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: DPAPI Domain Backup Key Extraction
id: 4ac1f50b-3bd0-4968-902d-868b4647937e
status: test
description: Detects tools extracting LSA secret DPAPI domain backup key from Domain Controllers
references:
    - https://threathunterplaybook.com/hunts/windows/190620-DomainDPAPIBackupKeyExtraction/notebook.html
author: Roberto Rodriguez @Cyb3rWard0g
date: 2019-06-20
modified: 2022-02-24
tags:
    - attack.credential-access
    - attack.t1003.004
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4662
        ObjectType: 'SecretObject'
        AccessMask: '0x2'
        ObjectName|contains: 'BCKUPKEY'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://threathunterplaybook.com/hunts/windows/190620-DomainDPAPIBackupKeyExtraction/notebook.html