The FBI says more than 2.5 million systems infected with DNSChanger malware connected to DNS servers set up by authorities in the week following a crackdown on a global criminal network dubbed Ghost Click. The data is the best indication yet of the scope of the Ghost Click network, which was the target of a coordinated take down on November 8 by the FBI and a long list of government and law enforcement agencies and private corporations around the world. At the time of the bust, the FBI estimated the scheme affected some 4 million individuals worldwide, and 500,000 in the U.S.
Source: https://threatpost.com/two-million-requests-infected-systems-week-after-ghost-click-takedown-120111/75948/