Threat description




W97M/FF is a simple Word class infector.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details


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


line to


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.

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