German World Cup fans who use Windows are being warned of a Trojan horse, which is masquerading as a downloadable tournament game plan.

The Baden-Württemberg State Bureau of Criminal Investigation (LKA) warned on Wednesday of an email with a link to a self-extracting Excel file that claims to contain the game plan for the soccer tournament. The German-language email contains the message "Fussball Weltmeisterschaft 2006 in Deutschland" (2006 World Cup Soccer Tournament in Germany) and the link "googlebook.exe."

When clicked, the link will install a Trojan horse on users PCs, according to LKA.

The agency has informed Germany's Federal Office for Information Security (BSI) and, because the Trojan horse appears to have originated from a server in the US, the Federal Bureau of Investigation (FBI) as well.

LKA officials were unable to say whether an English-language version of the spam email with the googlebook.exe is making the rounds.

This isn't the first attempt to trick World Cup soccer fans, nor is it expected to be the last to take advantage of an event of global interest.

Last year, the world's governing soccer body, FIFA (Fédération Internationale de Football Association), warned fans and others that its name was being abused in a global phishing scam.

Several lottery companies had sent unsolicited emails announcing that recipients had won a lottery and requesting personal data, including bank account information, for them to claim the prize money. The lotteries claimed to be organized on behalf of, or in association with, FIFA.

Moreover, security experts including Mikko Hypp"nen, chief research officer for antivirus research at F-Secure, are concerned that the soccer tournament in Germany could also be fertile ground for mobile phone viruses if last year's World Athletics Championships in Finland, are any indication.

Visitors to the athletic event in Helsinki not only had to brave wind and rain, but also face the threat of catching the Cabir mobile phone worm, which first surfaced in June 2004.