"The number of malicious programs found online has reached an unprecedented high, say security firms. Reports vary but some estimates suggest there were five times as many variants of malicious programs in circulation in 2007 compared to 2006. Security company Panda Software said it was getting more than 3,000 novel samples of so called malware every day.
Criminals pump out variants to fool anti-virus programs that work, in part, by spotting common characteristics." – Content courtesy of BBC NEWS | Technology | Malicious programs hit new high