Gameover is based on the code from Zeus Trojan. it is from the the trojan family and is used in the countless online banking hiests.
Further, Zeus was sold as a botnet creation who had few thousand virtual money. Right now it is being controlled and maintained by a group of hackers from Russia and Ukraine.
Those are believed to have used botnet in high dollar corporate account takeovers that frequently were punctuated by massive distributed denial of service attacks.