The U.S. Computer Emergency Readiness Team released an advisory warning to users about a Trojan that disables security applications on Microsoft Windows Mobile application installations.

The malware affects Windows Mobile PocketPC devices, security experts say. Researchers at McAfee Avert Labs found that the Trojan, now known as WinCE/InfoJack, sends the infected device's serial number, operating system and other sensitive information to the Trojan's creators.

"It's not (a virus) that you download from a pirated site and get an infection," said Jamz Yaneza, research manager at Trend Micro. "It uses legitimate applications and repackages it with this particular Trojan."

Microsoft recommended that customers contact their OEMs and providers for the latest guidance on security threats on their particular devices. A spokesperson from the company also said that customers should understand the risks involved with social engineering order to protect themselves against malware threats and have safer experience online.