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

Position Last
Malware Percentage of reports

"Sircam, the virus which has hit the headlines by forwarding personal documents to addresses found on the infected user's computer, has affected thousands of businesses this month - even the FBI's NIPC division were hit," said Graham Cluley, senior technology consultant at Sophos. "The fact that such a high profile virus is continuing to trick users is particularly worrying - anti-virus software is available to stop this worm, yet it is still spreading. Users who do not want to risk their confidential documents being leaked to all of their contacts should update their software and follow safe computing guidelines."

1276 new viruses were discovered and protected against by Sophos Anti-Virus during July 2001.

The total number of viruses Sophos now detects and protects against is 66170.

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