12 February 2004
Sophos virus experts have warned computer users of a new variant of the Nachi worm (W32/Nachi-B) that attempts to remove infections of W32/MyDoom-A and W32/MyDoom-B, and download Microsoft security patches to unprotected computers.
Taking advantage of the same critical security hole in Microsoft Windows which was exploited by the Blaster worm, Nachi searches for unpatched computers. Once located, it infects the computer without asking the user's permission and hunts for traces of the MyDoom worms. If a MyDoom infection is found, the Nachi-B worm attempts to remove it and download patches to fix the Microsoft vulnerability.
More: http://www.sophos.com/virusinfo/articles/nachib.html

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