Systemd Service Creation — Sigma Rule

Rule metadata and linked tags

Author: Pawel Mazur. Source status: test; severity: medium. Source dates: 2022-02-03 / 2022-02-06.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f32bb99c4cc1ea87528d0769cc3e74de7ebe9349c949883bfc6df5d25d0a2dab

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: Systemd Service Creation
id: 1bac86ba-41aa-4f62-9d6b-405eac99b485
status: test
description: Detects a creation of systemd services which could be used by adversaries to execute malicious code.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1543.002/T1543.002.md
author: 'Pawel Mazur'
date: 2022-02-03
modified: 2022-02-06
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.t1543.002
logsource:
    product: linux
    service: auditd
detection:
    path:
        type: 'PATH'
        nametype: 'CREATE'
    name_1:
        name|startswith:
            - '/usr/lib/systemd/system/'
            - '/etc/systemd/system/'
    name_2:
        name|contains: '/.config/systemd/user/'
    condition: path and 1 of name_*
falsepositives:
    - Admin work like legit service installs.
level: medium

Original YAML and metadata in JSON

False positives

• Admin work like legit service installs.

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1543.002/T1543.002.md