December 30, 2004 11:09 AM PST

Cabir worm code wriggles onto Web

The source code for more versions of the Cabir cell phone virus is now available online, a security company has warned.

Sophos said on Wednesday that a 32-year-old Brazilian programmer has published the source code for the Cabir-H and Cabir-I viruses online and said it could be used by virus writers to create their own variants.

This follows reports on Tuesday that a number of variants of the Cabir worm have been detected and that these offshoots have evolved beyond their comparatively benign predecessors. The worm affects phones running the Symbian operating system that use Bluetooth wireless technology.

"Publishing virus source code on the Web is dangerous because it encourages others to create malware," Graham Cluley, senior technology consultant at Sophos, said in a statement.

The Brazilian programmer claims to have written the worms from scratch because so many people had contacted him asking if he had the source code for the original Cabir worm, according to Sophos.

Cluley said people should be cautious about installing applications on their cell phone, as more viruses may be written, now the code is freely available.

"Although viruses for mobile phones have to date been creating more hype than havoc, it's possible that more malicious people will now be investigating ways to infect cell phones. All users should be very careful about what applications they allow to install and run on their mobile device."

Symbian phone users can protect themselves by turning off the phone's "discoverable" mode, Sophos said. It said it has not yet received a report from a member of the public with a cell phone infected by a virus.

The malicious software affects only Symbian OS-based phones running Nokia's Series 60 user interface, according to Symbian.

Ingrid Marson of ZDNet UK reported from London.

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The Symbian OS Operating System
The Symbian OS is a mini Operating System, and so will serve
the same fait as, say, Windows. As the understanding of
programming for the Symbion OS become clearer to some, it will
post havoc for others, and this in return will produce:<br>
*Antivirus Software...for your cell phone<br>
*Spam Software.....for your cell phone<br>
*And Security Issues for your Cell Phone<br>
I own a N-Gage QD and use EVERY part of it (<a class="jive-link-external" href="http://" target="_newWindow">http://</a>, so this news effects
my world alot more than most!
There is a serious need to Certify the Programs that are worthy
of installing on the Symbian OS because it is currently too easy
install malicious programs either through Email or Multi Media
Messaging (MMS).

With all that said, Symbian OS Rocks and you can check your
phone out here (<a class="jive-link-external" href="" target="_newWindow"></a>)
to see if you may be at risk for this Virus or any future problems
that may arise. Oh-By the way, turning off your Bluetooth or
Hidding your device does not necessarily make you any more
secure. Bluetooth has already been proven to have flaws in it
(thanks to a few good SuperGeeks). Enough Said
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