W97M/Steak is a Word 97 macro virus.
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 closed, W97M/Steak.A infects the global template. While infecting, it creates two temporary files to the root of the "C:" drive.First file, "A1.sys", is used to infect the active document while the another, "A1.inf", is used to infect the global template.After the global template has been infected, the virus infects all opened documents.
Technical Details: Sami Rautiainen, F-Secure