macro.excel.sof
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Description:
Details
Macro.Excel.Sofa
This virus infects Excel sheets. It contains only one module (macro). This module has the name containing 11 spaces and is invisible in system - menu Microsoft Excel Tools/Macros does not show any macros. The virus module has four functions: Auto_Open, Auto_Range, Current_Open, Auto_Close.
While opening an infected file the virus function Auto_Open takes control. This function "renames" Excel - the title "Microsoft Excel" is replaced with "Microsofa Excel". This function then infects the system. To do that it looks for BOOK.XLT file in Startup Path. If there is no such file (the system is not infected), the virus displays:
Microsoft Excel has detected a corrupted add-in file.
Click 'OK' to repair this file.
Not depending on user's reply, the virus creates there the BOOK.XLT file containing virus code. After infecting the virus displays:
File successfully repaired!
While loading into the system Excel loads all XLT files (including infected BOOK.XLT) from Startup Path, and as a result the virus takes control as far as Excel is loading. The virus then sets its function Auto_Range for system function OnSheetActivate. On any sheet activation this function takes control and infects the active file, if it is not infected yet.
The virus does not allow to unload itself from the system - while closing any file the virus sets the system function OnWindow to its function Auto_Range. As a result the virus re-installs itself while opening any file.
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