The Beebone botnet has been shut down in a joint operation between U.S. and European law enforcement and a number of private security firms. The operation was carried out by the FBI, the Department of Homeland Security, Europol and Dutch authorities. The network infected nearly 12,000 machines worldwide with a polymorphic downloader used to serve banking malware, ransomware, password stealers, rootkits and other malware. Once installed, it morphs every few hours and rapidly spreads across the network.”]
Source: http://securityaffairs.co/wordpress/35839/cyber-crime/beebone-botnet-take-down.html