This particular email message is a hoax. The file that is mentioned in the hoax, however, Sulfnbk.exe, is a Microsoft Windows 95/98/Me utility that is used to restore long file names, and like any .exe file, it can be infected by a virus that targets .exe files.
Symantec Security Response encourages you to ignore any messages regarding this hoax. It is harmless and is intended only to cause unwarranted concern.
