This chart counts down the 10 most frequently occurring viruses as compiled by Sophos, a world leader in corporate anti-virus protection. For April 2002, the virus chart is as follows, with the most frequently occurring virus at number one:
"The various manifestations of the Klez worm dominate April's virus chart with variants taking up the number one, two and six slots," said Graham Cluley, senior technology consultant at Sophos Anti-Virus. "Klez-H was the hard hitter; some commentators went so far as to call this the biggest worm in the world ever. In reality, the success of Klez-H is damning evidence that computer users are failing to keep their anti-virus software up-to-date. Sophos issued protection for variant G - which also protects against Klez-H - back in early February."
The top 10 hoaxes reported to Sophos during April 2002 are as follows:
"Virus hoaxes - e-mails warning of highly destructive but mythical viruses - spread and cause havoc because users are duped into thinking the warnings are real. In some instances, hoaxes can be as disruptive and costly as genuine viruses," said Cluley. "'A virtual card for you' was first reported in December 2000, but it is still catching users out. Introducing an anti-hoax policy will limit the harm done."