Security firm Sophos warned on Thursday that e-mails being circulated on the Web that purport to offer a free iPhone game instead are carrying a Trojan horse that can take control of infected Windows machines.
The e-mails have subject lines like "Virtual iPhone games!" and "Apple: The most popular game!" The attachment is called "Penguin.Panic.zip," which refers to the iPhone game of the same name.
The Trojan has been identified as Troj/Agent-HNY, Sophos said.
Sophos has not yet seen versions that run on Mac OS X, the Apple iPhone, or other mobile devices.