Findstr GPP Passwords — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2021-12-27 / 2023-11-11.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 918588cd1f98a01092dee6b4a0d5136cba6543a44fcf7c375e3ae1a64920c71c

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: Findstr GPP Passwords
id: 91a2c315-9ee6-4052-a853-6f6a8238f90d
status: test
description: Look for the encrypted cpassword value within Group Policy Preference files on the Domain Controller. This value can be decrypted with gpp-decrypt.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.006/T1552.006.md#atomic-test-1---gpp-passwords-findstr
author: frack113
date: 2021-12-27
modified: 2023-11-11
tags:
    - attack.credential-access
    - attack.t1552.006
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\find.exe'
              - '\findstr.exe'
        - OriginalFileName:
              - 'FIND.EXE'
              - 'FINDSTR.EXE'
    selection_cli:
        CommandLine|contains|all:
            - 'cpassword'
            - '\sysvol\'
            - '.xml'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_findstr_gpp_passwords/info.yml
simulation:
    - type: atomic-red-team
      name: GPP Passwords (findstr)
      technique: T1552.006
      atomic_guid: 870fe8fb-5e23-4f5f-b89d-dd7fe26f3b5f

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1552.006/T1552.006.md#atomic-test-1---gpp-passwords-findstr