.. /UtilityFunctions.ps1

Star

Paths:

• C:\Windows\diagnostics\system\Networking\UtilityFunctions.ps1

Resources:

• https://twitter.com/nickvangilder/status/1441003666274668546

Acknowledgements:

• Nick VanGilder (@nickvangilder)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/0.21-688-gd172b136b/rules/windows/process_creation/proc_creation_win_lolbas_utilityfunctions.yml

Execute

1. Proxy execute Managed DLL with PowerShell

   powershell.exe -ep bypass -command "set-location -path c:\windows\diagnostics\system\networking; import-module .\UtilityFunctions.ps1; RegSnapin ..\..\..\..\temp\unsigned.dll;[Program.Class]::Main()"

   Use case

   Execute proxied payload with Microsoft signed binary

   Privileges required

   User

   Operating systems

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

   ATT&CK® technique

   T1216

   Tags

   Execute: DLL

   This LOLBAS executes Dynamic-Link Libraries (DLLs).