Graybird is a Trojan horse that hides its presence on the compromised computer and downloads files from remote Web sites. There are many variations of this virus such as Backdoor.Graybird.P (the most recently discovered variation). It was discovered in September 3, 2003. It affects Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP, and Windows Vista.
References
Graybird Wikipedia(Text) CC BY-SA