The source code to the infamous Zeus crimeware kit, which has been sold on underground forums for years, has been leaked and is now available for anyone to see if they know where to look. Security researchers over the weekend noticed that files appearing to contain the source code for the Zeus crimeware kit were starting to pop up on various forums frequented by attackers and cyber-criminals. The Zeus exploit kit is perhaps the most well-known kit of its kind right now, and has been used by a variety of attackers for numerous malware campaigns and targeted attacks.