← cd ..OSBinaries

wuauclt.exe

Windows Update Client

Full path

C:\Windows\System32\wuauclt.exeC:\Windows\UUS\amd64\wuauclt.exe

Commands

ExecuteUser T1218
Execute dll via attach/detach methods
```
wuauclt.exe /UpdateDeploymentProvider {PATH_ABSOLUTE:.dll} /RunHandlerComServer
```
Loads and executes DLL code on attach.
os: Windows 10
Execute: DLL

Detection

Sigma https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/network_connection/net_connection_win_wuauclt_network_connection.yml
Sigma https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_lolbin_wuauclt.yml
Sigma https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_wuauclt_execution.yml
IOCwuauclt run with a parameter of a DLL path
IOCSuspicious wuauclt Internet/network connections

Resources

https://dtm.uk/wuauclt/

acknowledgement: David Middlehurst @dtmsecurity