Windows Update Client
wuauclt.exe /UpdateDeploymentProvider Full_Path_To_DLL /RunHandlerComServer
Full_Path_To_DLL would be the abosolute path to .DLL file and would execute code on attach.
Execute dll via attach/detach methods
C:\Windows\System32\wuauclt.exe
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, IOC: wuauclt run with a parameter of a DLL path, IOC: Suspicious wuauclt Internet/network connections
David Middlehurst (@dtmsecurity)