Creation Of A Local User Account — Sigma Rule

Rule metadata and linked tags

Author: Alejandro Ortuno, oscd.community. Source status: test; severity: low. Source dates: 2020-10-06 / 2023-02-18.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: dead2ec096d7681f144d8c25839f743dbe3b4622466debc978b92791378fb693

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: Creation Of A Local User Account
id: 51719bf5-e4fd-4e44-8ba8-b830e7ac0731
status: test
description: Detects the creation of a new user account. Such accounts may be used for persistence that do not require persistent remote access tools to be deployed on the system.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1136.001/T1136.001.md
    - https://ss64.com/osx/sysadminctl.html
author: Alejandro Ortuno, oscd.community
date: 2020-10-06
modified: 2023-02-18
tags:
    - attack.t1136.001
    - attack.persistence
logsource:
    category: process_creation
    product: macos
detection:
    selection_dscl:
        Image|endswith: '/dscl'
        CommandLine|contains: 'create'
    selection_sysadminctl:
        Image|endswith: '/sysadminctl'
        CommandLine|contains: 'addUser'
    condition: 1 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/T1136.001/T1136.001.md
• https://ss64.com/osx/sysadminctl.html