Nohup Execution — Sigma Rule

Rule metadata and linked tags

Author: Christopher Peacock @SecurePeacock, SCYTHE @scythe_io. Source status: test; severity: medium. Source dates: 2022-06-06 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f08acf3990807f669a89cce6992c5d05845fa2e47e5556465846412ca3eaea2c

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: Nohup Execution
id: e4ffe466-6ff8-48d4-94bd-e32d1a6061e2
status: test
description: Detects usage of nohup which could be leveraged by an attacker to keep a process running or break out from restricted environments
references:
    - https://gtfobins.github.io/gtfobins/nohup/
    - https://en.wikipedia.org/wiki/Nohup
    - https://www.computerhope.com/unix/unohup.htm
author: 'Christopher Peacock @SecurePeacock, SCYTHE @scythe_io'
date: 2022-06-06
tags:
    - attack.execution
    - attack.t1059.004
logsource:
    product: linux
    category: process_creation
detection:
    selection:
        Image|endswith: '/nohup'
    condition: selection
falsepositives:
    - Administrators or installed processes that leverage nohup
level: medium

Original YAML and metadata in JSON

False positives

• Administrators or installed processes that leverage nohup

Source references

• https://gtfobins.github.io/gtfobins/nohup/
• https://en.wikipedia.org/wiki/Nohup
• https://www.computerhope.com/unix/unohup.htm