W97M/JB is a quite simple Word 97 macro virus.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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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.