An MSN Messenger Trojan is growing a botnet by hundreds of infected PCs per hour, adding VMs to the mix as well.
The malware is being introduced by MSN Messenger files posing as pictures, mostly seeming to come from known acquaintances
http://www.eweek.com/article2/0,1759,22 ... X1K0000594
Suggest keeping updated with your MSN client. 8.5 final has been released recently.