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

Position Last
Malware Percentage of reports

"Whilst some viruses cause a fright then fade away, Sircam continues to haunt companies - four months after its release, it's still infecting a significant number of users," said Graham Cluley, senior technology consultant at Sophos Anti-Virus. "It's mind-boggling that people are still getting caught out by Sircam. Anti-virus software protects against this worm, and simple safe computing should negate the threat."

812 new viruses were discovered and protected against by Sophos Anti-Virus during October 2001.

The total number of viruses Sophos now detects and protects against is 68,923.

More information about Sircam</>.

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