Top ten viruses reported to Sophos in January 2001

Sophos Press Release

This is the latest in a series of monthly charts counting down the ten most frequently occurring viruses as compiled by Sophos, a world leader in corporate anti-virus protection.

For January 2001, the chart is as follows, with the most frequently occurring virus at number one:

Position Last
Malware Percentage of reports

"The first top ten of the new year is dominated by relatively new viruses," said Graham Cluley, senior technology consultant at Sophos Anti-Virus. "Users cannot afford to be lax in updating their anti-virus software, even following the Christmas period. It would be dangerous for companies to let the holiday hangover put holes in their IT hard hats."

The major events in January included Ramen, an in-the-wild worm which attacks Linux servers, and Melissa-X which appeared in the Word 2001 file format for the first time.

1384 new viruses were discovered and protected against by Sophos during January 2001.

The total number of viruses Sophos detects and protects against is 60,151.

More information about W32/Navidad-B.

Compiled by Sophos's technical support team, the top ten chart is collated from calls to Sophos's 24 hour, 365 days a year technical support line.

Graphics of the above Top Ten chart are available here.

More than 100 million users in 150 countries rely on Sophos’ complete security solutions as the best protection against complex threats and data loss. Simple to deploy, manage, and use, Sophos’ award-winning encryption, endpoint security, web, email, mobile and network security solutions are backed by SophosLabs - a global network of threat intelligence centers. Sophos is headquartered in Oxford, U.K., and is publicly traded on the London Stock Exchange under the symbol “SOPH.” More information is available at