IMDDOS Botnet

http://www.damballa.com/downloads/r_pubs/Damballa_Report_IMDDOS.pdf

IMDDOS botnet provides a well organized commercial DDoS service.
Damballa says that it was found because the botnet activity is so noisy.
The communication between C&C servers and clients, the client binaries, and the domain names are not encrypted.