Security researchers have identified a botnet controlled by its creators over the Tor anonymity network. It’s likely that other botnet operators will adopt this approach, according to the team from vulnerability assessment and penetration testing firm Rapid7.

via Tor network used to command Skynet botnet – online safety, security, Rapid7, encryption, spyware, malware, privacy, bitdefender, kaspersky lab – Computerworld.

“One countermeasure that companies or ISPs could eventually enforce in their firewall is to drop all packets that originate from known TOR nodes, in order to minimize the amount of potentially malicious traffic they receive,” Botezatu said. “Of course, they might also end up blacklisting a number of legit Tor users looking for anonymity.”