Sophos: Top Ten Viruses In July 2001

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:

1. W32/Sircam-A (Sircam) 65.2%

2. W32/Magistr-A (Magistr) 10.4%

3. W32/Hybris-B (Hybris variant) 4.1%

4. W32/Badtrans-A (BadTrans) 2.8%

5. W32/Apology-B (Apology variant) 1.9%

6. VBS/Kakworm (Kakworm) 1.4%

7. Troj/Keylog-C (Keylog variant) 1.0%

8. Joke/Hhold (Hhold) 0.8%

= 9. W32/Flcss (Funlove) 0.7%

= 9. W32/Qaz (Qaz) 0.7%

Others 11%

“Sircam, the virus which has hit the headlines by forwarding personal documents to everyone in the infected user’s inbox, 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.”

794 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 64894.

For more information about Sircam visit:

Graphics of the above Top Ten chart are available at:

For more information about safe computing visit:

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

About Sophos

Sophos is one of the world’s largest specialist developers of anti-virus software. The products are sold and supported through a global network of subsidiaries and partners in more than 120 countries. Sophos Anti-Virus is widely used by large corporations, banks and governments.

For further information, please visit

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