W97M/JB is a quite simple Word 97 macro virus.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
W97M/JB is executed when an infected document is opened. At this time the virus adds the following text to the end of the document:
Jim The Great
The virus also adds the following footnote:
Then it infects the global template. After that all opened, closed or created documents will be infected.
Technical Details: Sami Rautiainen, F-Secure