“Necurs, a nearly two-year-old rootkit, has been spreading quickly recently and was found on 83,427 unique machines during the month of November, according to researchers at Microsoft.
Necurs is distributed through drive-by download and and may occur anytime a user visits an infected website, says Tim Liu, a researcher at Microsoft’s Malware Protection Center, in a blog.”
Source: Necurs Rootkit Spreading Quickly, Microsoft Warns – Dark Reading