Compromised U.S. computers: 230,000

Main crime use: Also know as Gamina, Gamania, Frethog, Vaklik and Krap, this crimeware focuses on stealing online game logins, passwords and account information. It uses rootkit techniques to load into the address space of other common processes, such as Explorer.exe, and will spread through removable media such as USB keys. It's also known to be the worm that got into the International Space Station in the summer of 2008.