Security threats Toolkit

After two years, Netsky-P is still worst virus

Dawn Kawamoto CNET News.com

Published: 04 Sep 2006 09:20 BST

Netsky-P led the top 10 chart for malicious software threats in August, retaining its rank despite the availability of fixes for more than two years.

During August, Netsky-P accounted for 19.9 percent of all malicious software incidents reported, according to a report released on Friday by security researcher Sophos. Netsky-P, which remains the most widely spread of the email worms, was ranked the worst virus of 2004.

Just one in 278 emails was infected during the month, a significant decrease compared with August 2005 when one in every 50 emails circulating was viral, according to Sophos.

Sophos identified a total of 1,998 new threats in August 2006, with Trojan horses accounting for 71.8 percent of those threats.

Netsky-P was followed by Mytob-AS, which accounted for 15.8 percent of malicious software reports, while Bagle-Zip accounted for 8 percent of reports, according to Sophos.

"It is certainly frustrating that such easily beaten threats are still plaguing our email highways," Carole Theriault, a Sophos senior security consultant, said in a statement. "If you use the Internet and don't have proper security measures in place, you are not only endangering your data, you are keeping nasty old timers like Mytob and Netsky worms alive and kicking."

But some industry observers question the usefulness of keeping tabs on how widespread a virus roams, versus other metrics such as the degree in which it affects users' wallets when sensitive data is stolen. Malicious attackers over the years have switched their agenda from seeking fame to obtaining profits.