The virus is stored in a hidden sheet and spreads by replicating itself in your personal macro workbook (personal.xls). Once the virus makes its way to the personal.xls file, it spreads to all other Excel files that you open. Another strain of the virus writes a file named pldt.xls in your \xlstart directory.

If you find a pldt.xls file on your system, or notice other strange goings-on ù for example, extra sheets or unknown macros listed in the Macros dialogue box ù there's a good chance your system is infected. Your first line of defense is to get the latest update of your favourite antivirus program and eradicate the virus. All the major antivirus software programs (such as Symantec's Norton AntiVirus and McAfee's VirusScan) can detect and remove the Laroux virus. Performing a virus scan on a regular basis will help you stamp out the virus at an early stage.