WM/Muck is a simple Word macro virus.
It activates when an infected document is opened. Then it infects the global template. After Word has been restated it infects every saved document after that.
Beside replication, it will show a message box from time to time with the following text:
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
Find the latest advice in our Community Knowledge Base.
See the manual for your F-Secure product on the Help Center.
Submit a file or URL for further analysis.