Suspicious Commands Linux — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: medium. Source dates: 2017-12-12 / 2022-10-05.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f46bcb8be7f5e0eb16478c51849a697a6a3e786b9dc1b4e1f1abd223b0889d77

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: Suspicious Commands Linux
id: 1543ae20-cbdf-4ec1-8d12-7664d667a825
status: test
description: Detects relevant commands often related to malware or hacking activity
references:
    - Internal Research - mostly derived from exploit code including code in MSF
author: Florian Roth (Nextron Systems)
date: 2017-12-12
modified: 2022-10-05
tags:
    - attack.execution
    - attack.t1059.004
logsource:
    product: linux
    service: auditd
detection:
    cmd1:
        type: 'EXECVE'
        a0: 'chmod'
        a1: 777
    cmd2:
        type: 'EXECVE'
        a0: 'chmod'
        a1: 'u+s'
    cmd3:
        type: 'EXECVE'
        a0: 'cp'
        a1: '/bin/ksh'
    cmd4:
        type: 'EXECVE'
        a0: 'cp'
        a1: '/bin/sh'
    condition: 1 of cmd*
falsepositives:
    - Admin activity
level: medium

Original YAML and metadata in JSON

False positives

• Admin activity

Source references

• Internal Research - mostly derived from exploit code including code in MSF (source note; no public URL supplied)