With millions lost each year, cyber crime has evolved from a minor nuisance to a major concern involving well-organized actors and highly sophisticated organizations. Arguably one of the most important challenges of the 21st century, with millions lost each year, cyber crime has evolved from a minor nuisance to a major concern involving well-organized actors and highly sophisticated organizations. This volume explores the state of threats present in the cyber fraud underground. It discusses phishing/pharming, trojans/toolkits, direct threats, and pump-and-dump scams. By examining the operations of the cyber criminal, the book provides perspective into the general incentives, risks, and behavioral patterns of the fraudsters. Armed with this information, organizations and individuals are better able to develop countermeasures and crafting tactics to disrupt the fraud underground and secure their systems.