X97M/Extras is a macro virus written in Visual Basic for Applications
and is the first polymorphic macro virus to infect XLS files within
Microsoft Excel v.8.0.
Extras changes its appearance so it looks different in every infected
The virus also creates an infected Excel spreadsheet within the Excel
Extras activates on and after January 1st, 1999. At this time, the virus
will try to remove all menus from Excel interface.
X97M/Extras has nothing to do with the WM/Extra Word macro virus.