W97M/Mmkv is a Word 97 macro virus with destructive payload.
The virus gets control when an infected document is opened, and then the virus infects the global template.
After that it infects all documents that are opened or saved.
The virus hooks "Tools/Macros/Macro" dialog and "Tools/Macros/Visual Basic Editor" rendering them unusable.
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.
Variant:Mmkv.A
The payload of W97M/Mmkv.A activates on any day of the year 2000. Then the virus deletes all files from both the current directory and the root of the "C:" drive. Finally the virus show a message box with a title:
MK-Words By MMK 1999
and with the text:
Welcome To Y2K
Variant:Mmkv.B
W97M/Mmkv.B has two different payloads. The first activates every 3rd day of each month and then the virus shows a message box with the following title:
MK-Words By MMK 1999
and with the following text:
Y2K is coming soon...
The second payload activates any day of the year 2000 and at this time the virus drops an executable binary file "c:\end.com", and executes it. This binary file attempts to format the 9th track of the first hard drive, in effect destroying the root directory and FAT of the first partition.
Then the virus shows a message box with the same title as before but with the text:
Welcome To Y2K
Variant:Mmkv.C
W97M/Mmkv.C is a slightly modified variant of the W97M/Mmkv.B. When the payload activates, this variant creates a file "c:\end.a", but it will be never executed.