The first Trojan program has reached iPhone, the most popular and innovative gadget for year 2007 from Apple. According to the US Computer Emergency Response Team (US-CERT), software called "iPhone firmware 1.1.3 prep" is available online for iPhone users. The software update is projecting itself as an important update before Apple's much awaited 1.1.3 update is officially released.

When the user downloads the software and installs it, the Trojan displays the word "shoes". If the user tries to uninstall the Trojan, a number of applications such as Doom, OpenSSH, Launcher and Erica's Utilities are removed, meaning that the user will have to reinstall those applications.

The US-CERT has issued a warning that a fraudulent iPhone upgrade is making its way around the Internet and users should not be fooled into installing it.

The security firms Symantec and F-Secure have also confirmed the news of first Trojan for Apple iPhone.
Orla Cox, an Antivirus Expert at Symantec said, “This is technically the first Trojan horse seen for the iPhone, however it does appear to be more of a prank than an actual threat."

The impact of uninstalling the 'Trojan' would appear to be an unintended side effect. The risk to users is minimal as they would have to choose to install the bogus package and the site which was hosting it has now been taken offline. Nevertheless, iPhone users should exercise caution regarding the packages they choose to install on their phones," he added.

One website has reportedly claimed that 11-year old child had developed this Trojan accidentally, while he was playing with XML files. The Apple iPhone was released in the United States on June 29 and in select European countries during November last year.