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  4. FF

FF

Summary

W97M/FF is a simple Word class infector.

VARIANT:FF.AMacro.Word97.Lys.i

Summary

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 

    BootGUI=1

line to 

    BootGUI=0

This causes Windows 95/98 to start in command line mode after boot, instead of graphical user interface (GUI).

VARIANT:FF.C

Summary

This variant is functionally identical with W97M/FF.A.

[Analysis: Sami Rautiainen, F-Secure]