Detection rules › Sigma
Indirect Inline Command Execution Via Bash.EXE
Detects execution of Microsoft bash launcher with the "-c" flag. This can be used to potentially bypass defenses and execute Linux or Windows-based binaries directly via bash.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1202 Indirect Command Execution |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Indirect Inline Command Execution Via Bash.EXE
id: 5edc2273-c26f-406c-83f3-f4d948e740dd
related:
- id: 2d22a514-e024-4428-9dba-41505bd63a5b
type: similar
status: test
description: |
Detects execution of Microsoft bash launcher with the "-c" flag.
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/
author: frack113
date: 2021-11-24
modified: 2023-08-15
tags:
- attack.stealth
- attack.t1202
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith:
- ':\Windows\System32\bash.exe'
- ':\Windows\SysWOW64\bash.exe'
- OriginalFileName: 'Bash.exe'
selection_cli:
CommandLine|contains: ' -c '
condition: all of selection_*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith:
- ':\Windows\System32\bash.exe'
- ':\Windows\SysWOW64\bash.exe'
- OriginalFileName: 'Bash.exe'
Stage 2: selection_cli
selection_cli:
CommandLine|contains: ' -c '
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|