Eset reports that a six year old Mumblehard botnet has been taken down by a joint effort of CyS Centrum LLC and the Cyber Police of Ukraine.

Shady criminals had been operating for six years by hacking into Linux servers and sending massive amounts of spam. Mumblehard operators started making changes to their malware's code, allowing the researchers to pinpoint the location of the true C&C server, which was found on a server with an IP in Ukraine.

Authorities were informed by Eset and they seized the IP transferred it to a security firm, who's now running a server that's sinkholing all the requests made by Mumblehard's bots.

The sinkholing operation took place on February 29, 2016. Since that time, ESET has detected over 4,000 bots trying to connect to their old server.

Source: SoftPedia