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Phone Worm Source Code Out, Expect More Threats: Page 2 of 3

How it got there is less important than the fact it is there, said Sophos' senior technology consultant Graham Cluley in a statement.

"Publishing virus source code on the Web is dangerous because it encourages others to create malware. Although viruses for mobile phones have been creating more hype than havoc, it's possible that more malicious people will now be investigating ways to infect cellphones," he said.

Currently, Cabir's effects are limited to blocking normal Bluetooth connectivity and draining the infected phone's battery (since the worm repeatedly tries to connect to other Bluetooth devices to spread itself).

Helsinki-based security firm F-Secure noted in an online advisory that the new copies of Cabir -- Cabir.h and Cabir.i -- are more efficient than their ancestors at spreading.

"Cabir originally would only spread to one new phone per reboot, which explains why it so far has only managed to spread to eight countries despite being in the wild for months," F-Secure said in a statement issued Tuesday.