Yes, that's right! The Kelihos botnet, taken down my Microsoft and Kaspersky labs last year, resumed it's spam spewing actions, apparently, just shortly after it was taken down. Thus highlighting the need to have this malware removed from infected devices and decapitation just isn't effective enough.
Story @ The Register
Analaysis @ Kaspersky
The spam-spewing Kelihos botnet has returned from the dead.
Microsoft collaborated with Kaspersky Lab to run a successful takedown operation last September. The takedown decapitated the botnet by shutting down command-and-control server nodes, directing the bots on infected computers to contact a server under the control of security researchers, rather than one controlled by the attackers.
Story @ The Register
Analaysis @ Kaspersky