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 move the file to the quarantine where it cannot spread or cause harm, or remove it.
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