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Conficker has become the boogeyman of the security industry over the last year. The latest variant of the worm, Conficker.C, is programmed to do something on April 1. But what exactly will happen? The scary thing is, no one can say for sure.
The "A" and especially "B" variants of this worm (also known as Downadup) have built a botnet estimated at several million PCs, almost exclusively through exploitation of the MS08-067 vulnerability in Windows. Conficker added some innovative techniques to update itself though a large number of domains, the names of which were algorithmically generated by the program. Because the names were deterministic, it was possible for the DNS authorities (VeriSign, et al) to block the names. With few exceptions, the worm has been unable to spread since that point several weeks ago.
Then the "C" variant came along. It adds a number of defensive measures designed to protect itself from detection and removal and it ratchets up the number of domains it can check for updates. As this very large and thorough analysis of Conficker.C from SRI International says, "...Conficker C increases the number of daily domain names generated, from 250 to 50,000 potential Internet rendezvous points. Of these 50,000 domains, only 500 are queried, and unlike previous versions, they are queried only once per day." Thus "C" should generate less traffic than the earlier versions, especially in as much as it filters the IP addresses for these domains to make them work better and avoid detection.