There is a widely reported, but not clearly virulent IM worm infecting ICQ, called Bizex. The supposition is that the work is burrowing for financial information. Kaspersky Labs issued a warning, saying as many as 50,000 PCs had been infected. Symantec stated that far fewer infected PCs had been reported: 5.

The simple solution is to not click on any unknown or unfamiliar links sent to you in ICQ, especially anything to do with "jokeworld," a webist that was shut down only a few hours after the worm was discovered.