...claimed to offer a free installation of the peer-to-peer filesharing program Limewire. However, the program was secretlyinfected by Milmont with the Nugache malware. He also took over infected computers to send AOL instant messages to victims...
http://www.sophos.com/pressoffice/news/articles/2008/06/milmont.html
...only generated by professional spammers, but also by “botnets”, where the PCs of unsuspecting customers are secretlyinfected with rogue software to form a network that generates vast quantities of unwanted spam. These infected machines can...
http://www.detica.com/index.php?option=com_articlemanager&task=view&artid=26