Anti-virus companies are finding it hard to keep up with the new variant of malicious applications springing up over the Web.

An excerpt from Ars Technica:

The explosive growth in variant detection is another example of how the Storm worm and other copycat viruses wreaked havoc on IT infrastructure in 2007. As reported by SecurityFocus, F-Secure receives thousands of code samples a day which must be tested and analyzed by a relatively small staff.

The article reports that McAfee and F-Secure have a database of 360,000 and over 500,000 known malware variants so far.

Automating certain aspects of malware detection could go a long way in allaying the concern. As for now, throwing more resources at the detection process seems the only solution.