Setuid and Setgid — Sigma Rule

Rule metadata and linked tags

Author: Ömer Günal. Source status: test; severity: low. Source dates: 2020-06-16 / 2022-10-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 35a84705cc67f7a1c545d9d1880030934e49cbb6a8b8ecc58722b443efa12c9f

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: Setuid and Setgid
id: c21c4eaa-ba2e-419a-92b2-8371703cbe21
status: test
description: Detects suspicious change of file privileges with chown and chmod commands
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.001/T1548.001.md
author: Ömer Günal
date: 2020-06-16
modified: 2022-10-05
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1548.001
logsource:
    product: linux
    category: process_creation
detection:
    selection_root:
        CommandLine|contains: 'chown root'
    selection_perm:
        CommandLine|contains:
            - ' chmod u+s'
            - ' chmod g+s'
    condition: all of selection_*
falsepositives:
    - Legitimate administration activities
level: low

Original YAML and metadata in JSON

False positives

• Legitimate administration activities

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.001/T1548.001.md