Linux: Git Process Used to Launch a Shell via Bash/Dash/Sh Input Redirection

Flags Linux command lines where git usage (with -p and help) triggers bash/dash/sh execution via stdin redirection.

FreeReviewedSigma · High · v3

Product: linux
Category: process_creation
Author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.) (SigmaHQ), DRL 1.1
Published: 2024-09-02
Updated: 2026-07-31

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059Command and Scripting Interpreter
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags process creation where a parent process ending in /git runs with arguments containing both ' -p ' and 'help', and the child command line includes shell launch patterns using input redirection: 'bash 0<&1', 'dash 0<&1', or 'sh 0<&1'. Attackers may use this to spawn or manipulate shells, potentially enabling unauthorized command execution or bypassing restrictions. Detection relies on Linux process creation telemetry with access to both parent process image/command line and the spawned command line content.

Reporting behind it

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Linux: Git Process Used to Launch a Shell via Bash/Dash/Sh Input Redirection

Pivot detection · T1059 · 9 related

Changelog

v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

linux-git-invoked-with-shell-execution-via-redirected-stdin-to-bash-dash-sh-47b3bbd4

title: "Linux: Git Process Used to Launch a Shell via Bash/Dash/Sh Input Redirection"
id: 95692309-c22a-49ef-bd0f-258b297654af
status: test
description: "This rule flags process creation where a parent process ending in /git runs with arguments containing both ' -p ' and 'help', and the child command line includes shell launch patterns using input redirection: 'bash 0<&1', 'dash 0<&1', or 'sh 0<&1'. Attackers may use this to spawn or manipulate shells, potentially enabling unauthorized command execution or bypassing restrictions. Detection relies on Linux process creation telemetry with access to both parent process image/command line and the spawned command line content."
references:
  - https://gtfobins.github.io/gtfobins/git/#shell
  - https://github.com/SigmaHQ/sigma/blob/master/rules/linux/process_creation/proc_creation_lnx_git_shell_execution.yml
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.), Huntrule Team
date: 2024-09-02
tags:
  - attack.execution
  - attack.t1059
logsource:
  category: process_creation
  product: linux
detection:
  selection:
    ParentImage|endswith: /git
    ParentCommandLine|contains|all:
      - " -p "
      - help
    CommandLine|contains:
      - bash 0<&1
      - dash 0<&1
      - sh 0<&1
  condition: selection
falsepositives:
  - Unknown
level: high
license: DRL-1.1
related:
  - id: 47b3bbd4-1bf7-48cc-84ab-995362aaa75a
    type: derived

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