The Department of Justice in a court filing Wednesday in New Haven District Court announced an unprecedented “reverse hack” to remove a password-stealing computer virus from more than 2.3 million infected computers worldwide.

The virus, known as Coreflood, exploits vulnerable, unpatched Windows systems. Once infected, the victim’s computer establishes a connection to a remote server and also attempts to infect other PC’s on its local area network.  The virus operates in the background and victims don’t know their computer is infected. This is what makes it so dangerous.

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