Actually the answer just came right now: http://www.sophos.com/virusinfo/analyses/w32mimaili.html
W32/Mimail-I is a worm which spreads via email using addresses harvested from the hard drive of your computer. All email addresses found on your PC are saved in a file named el388.tmp in the Windows folder. In order to run itself automatically when Windows starts up the worm copies itself to the file svchost32.exe in the Windows folder and adds the following registry entry:
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