An anonymous reader writes: The U.S. Department of Justice has announced that Dimitry Belorossov, a.k.a. Rainerfox, an operator of the "Citadel" malware, has been sentenced to 4.5 years in prison following a guilty plea. Citadel was a banking trojan capable of stealing financial information. Belorossov and others distributed it through spam emails and malvertising schemes. He operated a 7,000-strong botnet with the malware, and also collaborated to improve it. The U.S. government estimates Citadel was responsible for $500 million in losses worldwide. Belorossov will have to pay over $320,000 in restitution.