In a blog post on Wednesday, F-Secure put the total number of infected machines at an estimated 3,521,230 — a rise of more than a million machines over the previous day's tally. The security firm bases its estimates on information it has gleaned by tapping into infected machines.
Downadup, which also goes by the name of Conficker, exploits a vulnerability outlined in MS08-067, a Windows Server service flaw that was patched in October. It executes a dictionary attack in order to try cracking user passwords, in the process locking user accounts out of the Active Directory domain. It emerged a week ago that Downadup can also infect USB sticks, thereby propagating on the client side.
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