Hackers have planted viruses in video games for smartphones running on Microsoft Corp’s Windows operating system, according to a firm that specializes in securing mobile devices.

The games — 3D Anti-Terrorist and PDA Poker Art — are available on sites that provide legitimate software for mobile devices, according to John Hering, CEO of San Francisco-based security firm Lookout.

Those games are bundled with malicious software that automatically dials premium-rate telephone services in Somalia, Italy and other countries, sometimes ringing up hundreds of dollars in charges in a single month.