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Newest: 1.3.3
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Active Rule
Indirect Command Execution From Script File Via Bash.EXE
Target Profile
Splunk
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Format Mode
Default
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Conversion Output
Indirect Command Execution From Script File Via Bash.EXE
Using Splunk · Default · pySigma 1.3.3
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion1.3.3
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.defense-evasion
- 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
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_bash_file_execution.yml