Source codes of infamous MPack, IcePack and Zeus and other botnet kits. (insom.org)

some mentions about those -

http://ddanchev.blogspot.com/2007/07/icepack-malware-kit-in-...

http://ddanchev.blogspot.com/2007/06/mpack-kit-attack-on-vid...

http://ddanchev.blogspot.com/2007/06/massive-embedded-web-at...

http://ddanchev.blogspot.com/2009/04/inside-zeus-crimeware-d...

http://ddanchev.blogspot.com/2008/12/zeus-crimeware-as-servi...