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wusa.exe

wusa.exe installs Windows Update Standalone packages (.msu). Common in enterprise workflows; can be demonstrated with benign, locally present .msu.

windows cli CLI

Install local MSU (demo)

Try Example
CLI

  1. Press Win-R

  2. Type: wusa C:\Windows\servicing\Packages\Microsoft-Windows-Anytime-Upgrade-Results-Client-Package~31bf3856ad364e35~amd64~~10.0.0.0.mum /quiet /norestart

  3. Press Enter

References:

Mitigations:

  • Restrict unsigned or unapproved MSU/installer sources; monitor wusa

Contributor: ClickGrab (2025-09-16)