Information Week has an article up about the latest virus attack. You can read it here.
In the article they refer to the worm as Kelvir.a and Kelvir.b:
The new worms, tagged as Kelvir.a and Kelvir.b, appeared over the weekend and on Monday, respectively, anti-virus vendors said. Both use the same mechanism to attract users and infect Windows-based PCs: they include a link in the instant message. That link, in turn, downloads a malicious file — the actual worm, a variant of the long-running Spybot — which opens a backdoor to the compromised machine.
Kelvir spreads by sending itself to all the MSN/Windows Messenger contacts on the infected PC, and poses as cryptic messages such as "lol! see it! u’ll like it!" and "omg this is funny!" The link opens a .pif-formatted file.
See my previous comments about PIF files here.
Posted by Jeff Wilkes.