X97M/Button is an Excel 97 macro virus.
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.
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When an infected workbook is opened, X97M/Button.A infects all worbooks that are currently open in Excel.During the process, it creates a temporary file, "C:\cmdbutton.bas" and adds a button of a smiling face to the menu bar of Excel.
Technical Details: Sami Rautiainen, F-Secure