<Quote>
Around six million systems remain infected with either the A or B
variants of Conficker. The C variant, which used a P2P method of
distribution, affects a lower number of around 120,000, as illustrated
by an infection tracker maintained by the Conficker Working Group
here.

Windows PCs infected with the C variant of Conficker were programmed
to download Spyware Protect 2009 (a scareware package) and the Waledac
botnet client, a strain of malware associated with spamming....

Utilities such as Microsoft's Malicious Software Removal Tool,
effective in cleaning up other infections, have proved ineffective
against Conficker because software security updates get disabled on
compromised machines.

"Conficker has created a stable pool of around six million infected
machines," Joffe warned. "These machines are running without updates
or anti-virus defences which creates a wide open backdoor." ...

"We can't take over the botnet and we don't know what it's doing -
it's uncrackable,"
</Quote>

http://www.theregister.co.uk/2010/08/05/conficker_analysis/