There doesn't appear to be any evidence of that being the case. Rustock (http://en.wikipedia.org/wiki/Rustock_botnet http://en.wikipedia.org/wiki/Rustock_botnet

There doesn't appear to be any evidence of that being the case. Rustock (http://en.wikipedia.org/wiki/Rustock_botnet http://en.wikipedia.org/wiki/Rustock_botnet) appears to be responsible for the bulk of the drop in volume, but several others smaller botnets have fallen silent too. There haven't been any reports of it being used for anything other than spam and isolated ddos attacks (http://www.joestewart.org/rustock-ddos.html http://www.joestewart.org/rustock-ddos.html) in it's 4 year history. It is a bit of a mystery as to what is going on, but my bet would be it'll resume with a new approach or upgrade, rather than a complete re-purposing.