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Port 666 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
666 tcp,udp doom Used by the game Doom (ID Software), however, because of the cool connotations, this port is also used by numerous trojan horses/backdoors.
Here is a list: Attack FTP, Back Construction, BLA trojan, Cain & Abel, NokNok, Satans Back Door - SBD, ServU, Shadow Phyre, th3r1pp3rz (the rippers), lpdw0rm.
Backdoor.FTP_Ana.C - backdoor trojan, 03.2003. Affects all current Windows versions.
Backdoor.Checkesp - backdoor trojan, 06.2003. Affects all current Windows versions.
Backdoor.Private - backdoor trojan, 05.2003. Affects all current Windows versions.
W32.Dreffort (04.05.2005) - Infects .exe and .scr files, deletes files on Dec. 29th. Also opens a backdoor on the 29th of each month on port 666/tcp.
Backdoor.Microkos (08.10.2005) - a trojan that opens a backdoor on the compromised computer. It listens for remote commands on port 65111/tcp, and can also open an additional backdoor on port 666/tcp.
Backdoor.Beasty - a backdoor Trojan horse that allows complete access to an infected computer. By default, the Trojan listens on port 666 and notifies the hacker through ICQ.

Dark and Light also uses this port.
666 udp Doom, first online first-person shooter (official) Wikipedia
666 tcp trojan Attack FTP, Back Construction, BLA trojan, NokNok, Reverse Trojan, Shadow Phyre, Unicorn, yoyo Trojans
666 tcp,udp mdqs IANA
666 tcp,udp doom doom Id Software IANA
666 tcp AttackFTP [trojan] Attack FTP SANS
666 tcp BackConstruction [trojan] Back Construction SANS
666 tcp BLAtrojan [trojan] BLA trojan SANS
666 tcp Cain&Abel [trojan] Cain & Abel SANS
666 tcp lpdw0rm [trojan] lpdw0rm SANS
666 tcp NokNok [trojan] NokNok SANS
666 tcp SatansBackDoor [trojan] Satans Back Door - SBD SANS
666 tcp ServU [trojan] ServU SANS
666 tcp ShadowPhyre [trojan] Shadow Phyre SANS
666 tcp th3r1pp3rz [trojan] th3r1pp3rz (= Therippers) SANS
666 tcp doom Id Software Doom Nmap
666 udp doom doom Id Software Nmap
666 tcp,udp mdqs mdqs Neophasis
666 tcp Cain&Abel [trojan] Cain & Abel Neophasis
666 tcp threat Beasty Bekkoame
666 tcp threat Cain & Abel Bekkoame
666 tcp threat Checkesp Bekkoame
666 tcp threat FTP_Ana Bekkoame
666 tcp threat Futro Bekkoame
666 tcp threat Microkos Bekkoame
666 tcp threat Private Bekkoame
666 tcp threat Sixca Bekkoame
666 tcp threat th3r1pp3rz Bekkoame
666 tcp threat W32.Dreffort Bekkoame
29 records found
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Related ports: 13  620  

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External Resources
SANS Internet Storm Center: port 666

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

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