Shell Execution via Git - Linux

Status: test
Severity: high
Log source: category process_creation, product linux
Author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
Source: github.com/SigmaHQ/sigma

Detects the use of the "git" utility to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

Telemetry coverage

Platform	Record / event type
Linux	Event ID 1: Process Create

Rule body

title: Shell Execution via Git - Linux
id: 47b3bbd4-1bf7-48cc-84ab-995362aaa75a
status: test
description: |
    Detects the use of the "git" 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/git/#shell
author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ParentImage|endswith: '/git'
    ParentCommandLine|contains|all:
        - ' -p '
        - 'help'
    CommandLine|contains:
        - 'bash 0<&1'
        - 'dash 0<&1'
        - 'sh 0<&1'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`bash 0<&1` `dash 0<&1` `sh 0<&1`	`field:"CommandLine" kind:match`
`ParentCommandLine`	match	`-p` `help`	`field:"ParentCommandLine" kind:match`
`ParentImage`	ends_with	`/git`	`field:"ParentImage" kind:ends_with value:"/git"`