The Trojan.Kirvo.B (Symantec) or W32/Kelvir.worm.ea (McAfee) was discovered on July 19/20 and spreads itself via Microsoft's Messenger Service (MSN). This is kind of like those emails you receive from a friend where they really didn't send it. But your friend did allow their computer to get infected and now they're trying to give it to you.

An infected computer will send an MSN instant message to anyone that is on the user's MSN buddy list. If you get it, you'll see an MSN message similar to this:
thats life day for you and the rest of days on you hehe [http://]KillingTime.dynu.net/[REMOVED]Images.php?pic=0017&sec=badluck

or

thats something you want to see everyday hehe http://[blocked].dynu.net/Images.php?pic=7458&sec=jokes

Like most viruses and trojans, there will be variants where the message is different. If the idiots that write this stuff ever figure out how to use good grammar and spelling, this type of attack could spell real trouble. If I got a message like this, I'd have to assume my friend was either drunk or stoned. Your response should not be to click on the link and see what they think is so funny. Send them a reply and say "WHAT?" If they don't reply, they're probably not there and their computer is doing it's own thing. Do your friend a favor and tell them they may be infected and demand they get their act together and get a good anti-virus/anti-spyware package (and keep it up to date).

These trojans install a backdoor spyware program called Spybot, but please do not mistake this one for the real SpyBot program that's an excellent anti-spyware program.

To read more about this virus and how to remove it visit these sites:

Symantec - Kirvo B McAfee - Kelvir