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07 Jan 2004

Top ten viruses and hoaxes reported to Sophos in December 2003

Sober worm takes top spot again, with new variant

Sophos, a world leader in protecting businesses against spam and viruses, has revealed the top ten viruses and hoaxes causing problems for businesses around the world.

The report, which examines virus and hoax reports in the month of December 2003, shows new worm variants Mimail-K and Sober-C are the most commonly reported, while the Hotmail hoax takes the top spot for a fifth month running.

The top ten viruses in December 2003 were as follows:

Position Last
month
Malware Percentage of reports
1NewW32/Sober-C
   23.3%
2NewW32/Mimail-K
   21.3%
34W32/Dumaru-A
   13.8%
48W32/Mimail-J
   2.7%
52W32/Mimail-C
   2.2%
6=6W32/Gibe-F
   1.9%
6=NewW32/Mimail-I
   1.9%
89W32/Klez-H
   1.8%
9=NewW32/Torvil-A
   1.6%
9=2=W32/Mimail-F
   1.6%
Others27.9%

"The Sober-C worm, which spread by email and peer-to-peer networks, was first seen on 21 December, yet it still managed to be the most reported worm of the month," said Carole Theriault, security consultant at Sophos. "Despite Sober-C's top position on the chart, the different Mimail variants accounted for nearly a third of all reports at 29.7%."

Sophos analysed and protected against 730 new viruses in December. The total number of viruses Sophos now protects against is 86,811.

"With more than 700 new viruses arriving in our lab during December, it's fair to say that virus writers were not interested in taking a break over the festive period," continued Theriault.

The top ten hoaxes reported to Sophos during December are as follows:

"The seasonal hoax, Elf Bowling, re-entered the chart in December, just in time for Christmas. The hoax claims that a bowling game with elves as pins is a virus which will activate on Christmas day," said Theriault.

Sophos has made available a free, constantly updated information feed for intranets and websites which means users can always find out about the latest viruses and hoaxes.

Graphics of the virus top ten chart are available here.

More information about safe computing, including anti-hoax policies.

Position Hoax Percentage of reports
1Hotmail hoax

 21.7%
2Meninas da Playboy

 15.2%
3A virtual card for you

 5.9%
4Bonsai kitten

 5.3%
5Press 9

 5.2%
6Budweiser frogs screensaver

 4.9%
7JDBGMGR

 4.0%
8Elf Bowling

 3.4%
9Bill Gates fortune

 3.2%
10Frog in a blender/Fish in a bowl

 3.0%
Others28.2%

About Sophos

More than 100 million users in 150 countries rely on Sophos as the best protection against complex threats and data loss. Sophos is committed to providing complete security solutions that are simple to deploy, manage, and use and that deliver the industry's lowest total cost of ownership. Sophos offers award-winning encryption, endpoint security, web, email, mobile and network security solutions backed by SophosLabs - a global network of threat intelligence centers.

Sophos is headquartered in Boston, US and Oxford, UK. More information is available at www.sophos.com.