A report disclosed by Wired suggests that the FBI is using a malware to identify Tor users by infecting machines on a large scale. FBI used a malicious code able to exploit a Firefox Zero-day for Firefox 17 version that allowed it to track Tor users. The malware implants a tracking cookie which fingerprinted suspects through a specific external server. The exploit is based on a Javascript that is a tiny Windows executable hidden in a variable dubbed Magneto Magneto code looks up the victims Windows hostname and MAC address and sends the information back to the FBI Virginia server exposing the victims real IP address.”]