Virus.Win32.Virut is the fastest-mutating virus known, with a new variant appearing as often as once a week. Virut.ce is one of the most widespread pieces of malware to be found on users computers. The virus propagates through infected files, both executable and HTML, or smaller programs designed to crack licensed software. Virus.c is the second most popular of all of the versions of Virus.win32.*.*.* detected on users’ computers.”]
Source: https://securelist.com/review-of-the-virus-win32-virut-ce-malware-sample/36305/