Indirect Command Execution From Script File Via Bash.EXE — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-08-15 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 4f3d42a34cc5268abb329f42cbc4b85c3270d99558b071d9e107b54980c1628e

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: Indirect Command Execution From Script File Via Bash.EXE
id: 2d22a514-e024-4428-9dba-41505bd63a5b
related:
    - id: 5edc2273-c26f-406c-83f3-f4d948e740dd
      type: similar
status: test
description: |
    Detects execution of Microsoft bash launcher without any flags to execute the content of a bash script directly.
    This can be used to potentially bypass defenses and execute Linux or Windows-based binaries directly via bash.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Bash/
    - https://linux.die.net/man/1/bash
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-15
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith:
              - ':\Windows\System32\bash.exe'
              - ':\Windows\SysWOW64\bash.exe'
        - OriginalFileName: 'Bash.exe'
    filter_main_cli_flag:
        CommandLine|contains:
            # Note: we're not interested in flags being passed first
            - 'bash.exe -'
            - 'bash -'
    filter_main_no_cli:
        CommandLine: null
    filter_main_empty:
        CommandLine: ''
    filter_main_no_flag:
        CommandLine:
            - 'bash.exe'
            - 'bash'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://lolbas-project.github.io/lolbas/Binaries/Bash/
• https://linux.die.net/man/1/bash
• Internal Research (source note; no public URL supplied)