WM/Swlabs is a very simple Word macro virus.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
When an infected document is opened, the virus infects the global template. After that it infects all opened documents.
Beside replication, the virus will remove "File/Templates" and "Tools/Macros" menu selections.
This variant changes the subject of the document to:
Green Bay Packers -- Super Bowl XXXI Champions
Additionally it infects all documents that are created and saved documents as well.
This variant doesn't do anything beside replicate.
Technical Details: Sami Rautiainen, F-Secure