CONFICKER

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Conficker, also known as Downup, Downadup and Kido, is a computer worm targeting the Microsoft Windows operating systemthat was first detected in November 2008. It uses flaws in Windows OS software and dictionary attacks on administrator passwords to propagate while forming a botnet, and has been unusually difficult to counter because of its combined use of many advanced malware techniques. The Conficker worm infected millions of computers including government, business and home computers in over 190 countries, making it the largest known computer worm infection since the 2003 Welchia.
The origin of the name Conficker is thought to be a combination of the English term "configure" and the German pejorative term Ficker (engl. fucker). Microsoft analyst Joshua Phillips gives an alternate interpretation of the name, describing it as a rearrangement of portions of the domain name trafficconverter.biz (with the letter k, not found in the domain name, added as in "trafficker", to avoid a "soft" c sound) which was used by early versions of Conficker to download updates.
                                          SOURCE:https://en.wikipedia.org/wiki/Conficker