Trojan.Win32.BlackBird is another fake warning alerts which is comes through trojan zlob. It promotes the rogue anti-spyware program. Trojan.Zlob is a back door Trojan that allows the remote attacker to perform various malicious actions on the compromised computer. If you are getting “Trojan.Win32.BlackBird” alerts, it means you are infected by Trojan.Zlob. (via)