Tor network offers users browse the Internet anonymously and is mostly used by activists, journalists to conceal their online activities from prying eyes. Cyber criminals are hosting malware’s Command-and-control server on an anonymous Tor network to evade detection. Kaspersky security researcher reported that Tor network is currently being used to hide 900 botnet and other illegal hidden services, through its 5,500 plus nodes i.e. Server relays and 1,000 exit nodes. Illegal use of the Tor network boosted up after the launch of the most popular underground Drug Market – that also offered arms and malware to their users against Bitcoin.
Source: https://thehackernews.com/2014/03/tor-network-used-to-host-900-botnets.html