File or Folder Permissions Change — Sigma Rule

Rule metadata and linked tags

Author: Jakob Weinzettl, oscd.community. Source status: test; severity: low. Source dates: 2019-09-23 / 2021-11-27.

{
  "product": "linux",
  "service": "auditd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9a1b88e8d1bd9d264a063056d614ff50c337a7cf80ab7bd594d89e865fc85dfe

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: File or Folder Permissions Change
id: 74c01ace-0152-4094-8ae2-6fd776dd43e5
status: test
description: Detects file and folder permission changes.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md
author: Jakob Weinzettl, oscd.community
date: 2019-09-23
modified: 2021-11-27
tags:
    - attack.defense-impairment
    - attack.t1222.002
logsource:
    product: linux
    service: auditd
detection:
    selection:
        type: 'EXECVE'
        a0|contains:
            - 'chmod'
            - 'chown'
    condition: selection
falsepositives:
    - User interacting with files permissions (normal/daily behaviour).
level: low

Original YAML and metadata in JSON

False positives

• User interacting with files permissions (normal/daily behaviour).

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1222.002/T1222.002.md