Threat Description

VCX

Details

Aliases:VCX, Xlscan
Category:Malware
Type:Virus
Platform:X97M

Summary



X97M/VCX is a Microsoft Excel 97 macro virus.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You also may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details




Variant:VCX.A

X97M/VCX.A activates when an infected workbook is closed or a worksheet is deactivated.

It creates a temporary file, "C:\Windows\System\Xlscan.386", and disables the macro virus protection via registry. Then the virus creates a new workbook, infects it and saves it to the Excel's startup directory with a name "Xlscan.xls". After that it infects every workbook using the temporary file.

It also creates eleven additional files to "C:\Windows\System" directory every time it gets control. Ten of these files will named after the current date and time, a number from 1 to 10 and the extension ".VCX"; while the last file will have a constant name "Xlscan.idx".


Variant:VCX.B

X97M/VCX.B is a slightly modified variant of X97M/VCX.A.


Variant:VCX.C

X97M/VCX.C is a modified variant of X97M/VCX.A. The file names are changed: Temporary file is "C:\Windows\System\MsOffice.386" and the file created to Excel's starup directory is "MsOffice.xls". Also the last file created to the Windows' System directory has a different name, "MsOffice.idx".





Description Created: Analysis: Sami Rautiainen, F-Secure


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