Worms made up more than 70 per cent of malware in February, according to antivirus specialists.
MyDoom.A and Sober C topped the infections charts for the month, with most of the Bagel and Netsky variants arriving too late in the day to register in the top 10.
"Once again, worms remain the main threat we are facing," said David Kopp, head of TrendLabs in Europe, the Middle East and Africa.
"There is still a significant lack of awareness regarding current internet security threats.
"Companies can significantly reduce the risk of becoming infected by putting into place some kind of aggressive security awareness campaign."
While Sober C and MyDoom.A dominate the charts, Lovegate and its variants are also still widespread. All these viruses arrive in infected attachments and must be activated by the target.
"You cannot excuse virus writers, but we could do more ourselves," said Professor Neil Barrett, technical director at Information Risk Management.
"All of the current big name viruses rely on the target being curious enough to open the attachment. If in doubt, don't."
These days companies are using increasingly intrusive techniques to get hold of your details and snoop on your surfing habits. We show you how to hit back. 27 May 2004
Project Manager - £ Competitive - London About BP Our business is the exploration, production, refining, trading and distribution of energy. This is what we do, and we do it on a truly global scale. ... more >
Business Consultant - £35,000 - £40,000 - Solihull We are in need of a Business Consultant with strong analytical skills and a penchant for learning the domain knowledge of the Utilities sector (Gas industry in ... more >
IT Leader -£ Competitive - London About BP Our business is the exploration, production, refining, trading and distribution of energy. This is what we do, and we do it on a truly global scale. With ... more >
Solution Architect Lead Hertfordshire Who's behind the world's most successful online retailer?Just over 10 years ago we started Tesco.com (aka Dotcom). Today, we've an incredible 750,000 active customers and sales at just under £1 billion. We ... more >More job opportunities