Latest smart phone Trojan spotted

A Trojan horse has been created that causes smart phones to crash, security software maker F-Secure has warned. However, while this is further evidence of a growing concentration of attention on the mobile phone by virus writers there is little sign of any infection in wild.

The Finnish company posted details of the Trojan horse, which they've named Fontal.A, on Wednesday. Fontal.A affects Nokia Series 60 handsets running the Symbian operating system.

Other Trojan horses, or applications that appear to be legitimate but perform illicit activity when they are run, have found their way into smart phones. But unlike the CommWarrior Trojan, Fontal.A does not propagate over Bluetooth wireless networking connections or MMS. Instead, it is distributed via file-sharing or IRC.

Fontal.A tries to install a corrupted file, called "Kill Saddam By OID500.sis," into the infected device, causing it to fail at the next reboot, F-Secure said. If the handset is rebooted, it gets stuck and can't be used until it is disinfected.

The Trojan also damages the application manager, preventing new programs from being installed and stopping the Trojan itself from being uninstalled. The only fix is to reformat the phone. However, doing this causes all data on the handset to be lost, F-Secure said.

The company suggested that the way to avoid Fontal.A and other Trojans is to download files only from known or trusted sources.

Richard Shim writes for News.com