Shell Execution via Nice - Linux — Sigma Rule

Rule metadata and linked tags

Author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.). Source status: test; severity: high. Source dates: 2024-09-02 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6beba1bc8053aa5b9f62f981944a3736ca590111e62b080244f0dd9a0a7a0254

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: Shell Execution via Nice - Linux
id: 093d68c7-762a-42f4-9f46-95e79142571a
status: test
description: |
    Detects the use of the "nice" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
references:
    - https://gtfobins.github.io/gtfobins/nice/#shell
    - https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
date: 2024-09-02
tags:
    - attack.discovery
    - attack.t1083
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/nice'
        CommandLine|endswith:
            - '/bin/bash'
            - '/bin/dash'
            - '/bin/fish'
            - '/bin/sh'
            - '/bin/zsh'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://gtfobins.github.io/gtfobins/nice/#shell
• https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html