Mumblehard was a unique botnet sending spam email messages, as it used packed quite a punch once it managed to get installed on a Linux machine. Not only did the malware hide the source code from security solutions, but it also install backdoor access on infected computers, and a mail daemon used to get the spam messages sent to other computer users. In total, over 4,000 Linux computers were part of this botnet at its peak.
http://bitcoinist.net/mumblehard-linux-botnet-will-no-longer-send-spam-messages/
