W97M/FF is a simple Word class infector.
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, W97M/FF.A deletes the "Tools/Macros" menu and disables the built-in macro virus protection first. Then the virus creates a temporary file, "C:\FF.sys", and infects the global template.
Afterwards every opened document is infected.
the virus activates its payload on the first day of every month. It alters the "c:\msdos.sys" file by changing the
This causes Windows 95/98 to start in command line mode after boot, instead of graphical user interface (GUI).
This variant is functionally identical with W97M/FF.A.
Technical Details: Sami Rautiainen, F-Secure