ZeroAccess Rootkit was discovered in November 2011 and has been causing havoc ever since.
It works by using and infected file from a package with a trusted certificate and then imbeds itself into system files such as svchost and loads the mimicked dll file instead of the original.
It is a Trojan Horse that opens a backdoor to download its own files.
This is one of the nastiest viruses around to date and can be extremely difficult to remove.
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