Shelly, this is the latest variant to the Redesi/32 worm.. There seems to be a discrepency in the naming for this virus, as I've seen it called a few different things now.
But yeah, as always, be careful with attachments to email, and never never never accept a DCC from someone in IRC that you do not know or were not expecting..
Also, it creates bots in some rooms which just sit there and wait for someone to say 'lol'. When thy do, it will PM you with the message: Check this out for me and get back to me' And it will DCC you a file, either karen.exe or more common, erica.exe.
Please everyone be careful & make sure your virus def's are up to date!!