Estimates of the number of infected computers were difficult because the virus changed its propagation and update strategy from version to version.[5] In January 2009, the estimated number of infected computers ranged from almost 9 million[6][7][8] to 15 million.[9] Microsoft has reported the total number of infected computers detected by its antimalware products has remained steady at around 1.7 million from mid-2010 to mid-2011.[10][11] By mid-2015, the total number of infections had dropped to about 400,000,[12] and it was estimated to be 500,000 in 2019.[13]
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).[14] Microsoft analyst Joshua Phillips gives an alternative interpretation of the name, describing it as a rearrangement of portions of the domain name trafficconverter.biz[15] (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.
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Intramar, the French Navy computer network, was infected with Conficker on 15 January 2009. The network was subsequently quarantined, forcing aircraft at several airbases to be grounded because their flight plans could not be downloaded.[20]
Working group members stated at the 2009 Black Hat Briefings that Ukraine is the probable origin of the virus, but declined to reveal further technical discoveries about the virus's internals to avoid tipping off its authors.[66] An initial variant of Conficker did not infect systems with Ukrainian IP addresses or with Ukrainian keyboard layouts.[3] The payload of Conficker.E was downloaded from a host in Ukraine.[51]
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