WM/Alien is a Word macro virus.
When an infected document is opened, the virus infects the global template. After that it infects all documents that are either opened or closed. It removes the "Tools/Customize..." and "Tools/Macro..." menu selections as well.
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.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
At random times while the virus infects the global template or the active document, it displays a random message boxes. These message boxes have the following title:
Alien
and the message text is one of the following:
Another Year of Survival ... It's Sunday & I intend to relax ! Now You See Me - Now You Don't ! Never Open Others Files ! Never Trust An Alien ! Don't Believe All Tips ! Always Back Up Your Data. Don't Believe The Hype ! Three Cheers For The Alien. Hip Hip Hooray ! I'll Be Back ! Hi Beautiful ! You Facinate Me. Look No Further ... The 'Alien' Virus Has Arrived ! The Alien Lives ... Longer File Names Should Be Used.
It also sometimes attempts to hide the Windows Program Manager or Word, exit from Windows completely or close the active document.