Top ten viruses reported to Sophos in August 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 August 2001, the chart is as follows, with the most frequently occurring virus at number one:

Position Last
Malware Percentage of reports

"The Sircam worm has now topped the charts for two months. The Magistr worm, which has dominated the charts for half a year, is continuing to make its presence felt in second place," said Graham Cluley, senior technology consultant for Sophos Anti-Virus. "Both worms play a similar trick - neither of the viruses use a standard filename or subject line so it is harder for users to know what to look out for. Careless clicking can lead to catastrophe - keep your anti-virus software up to date and do not open unsolicited attachments."

1051 new viruses were discovered and protected against by Sophos Anti-Virus during August 2001.

The total number of viruses Sophos now detects and protects against is 67221.

More information about safe computing.

Graphics of the above Top Ten chart are available here.

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.

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