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Port 6668 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
6668 tcp,udp irc IRC (Internet Relay Chat)

Many trojans/backdoors also use this port: Dark Connection Inside, Dark FTP, Host Control, NetBus worm , ScheduleAgent, SubSeven, Trinity, WinSatan, Vampire.
Backdoor.Hacarmy.E (10.14.2004) - remote access trojan.
W32.Spybot.EAS (10.01.2004) - DDoS and backdoor capabilities, also attempts to steal confidential info. Uses port 6667/tcp.
Backdoor.Sdbot.AC (10.01.2004) - backdoor trojan, uses port 6667/tcp.
Backdoor.Hacarmy.E (10.14.2004) - backdoor trojan, uses port 6667/tcp.
Backdoor.Alnica (11.03.2004) - backdoor trojan, uses port 6667/tcp to connect to IRC, also sends ICQ messages.
Backdoor.Maxload (11.04.2004) - backdoor trojan, affects Linux and Unix computers ! Attempts to connect to IRC servers on port 6667/tcp.
Backdoor.Hacarmy.F (11.04.2004) - backdoor trojan, connects to IRC servers on port 6667/tcp.
W32.Bofra.A@mm (11.08.2004) - uses ports 1639 and 6667/tcp.
Backdoor.Sdbot.AF (11.18.2004) - backdoor trojan, uses port 6667/tcp.
W32.Bofra.E@mm (11.12.2004) - a mass-mailing worm, runs a HTTP server on port 1639/tcp, attempts to connect to IRC servers on port 6667/tcp.
W32.Cissi.W (01.28.2005) - IRC bot worm with backdoor capabilities. Uses port 6667, propagates through network shares.
Backdoor.Lateda.B (01.17.2005) - backdoor trojan with remote access capabilities. Connects to an IRC server on port 6667, opens a backdoor on port 9999/tcp.
W32.Linkbot.M (05.24.2005) - opens a backdoor on port 6667/tcp. Also listens on port 113/tcp.
W32.Zotob.D (08.16.2005) - a worm that opens a backdoor and exploits the MS Plug and Play Buffer Overflow vulnerability (MS Security Bulletin [MS05-039]) on port 445/tcp. Conects to IRC servers to listen for remote commands on port 6667/tcp. Also opens an FTP server on port 1117/tcp.
W32.Zotob.H (08.19.2005) - a worm that opens a backdoor and exploits the MS Plug and Play Buffer Overflow vulnerability ([MS05-039]) on port 445/tcp. It runs and spreads using all current Windows versions, but only infects Windows 2000. The worm connects to IRC servers and listens for remote commands on port 6667/tcp. It opens port 69/udp to initiate TFTP transfers. It also opens a backdoor on remote compromised computers on port 8563/tcp.
6668 tcp irc Internet Relay Chat SANS
6668 tcp ircu IRCU SANS
6668,40000-42999 tcp applications Heroes of Might and Magic 5 Portforward
80, 2346-2348, 6668, 40000-42999 tcp applications Rainbow Six Lockdown with Portforward
6668,9102,40000-43000 tcp applications Spliter Cell Chaos Theory Portforward
6668, 9102, 27243-27245, 40000-43000 tcp applications Spliter Cell Chaos Theory w AllSeeingEye Portforward
6668,7073,40000-42999 tcp applications The Settlers V Heritage of Kings Portforward
6668 tcp irc Internet Relay Chat Nmap
6665-6669 tcp Internet Relay Chat (official) Wikipedia
6665-6669 tcp ircu IRCU IANA
6665-6669 udp Reserved IANA
12 records found
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Related ports: 3783  6500  6515  6660  6661  6662  6663  6664  6665  6666  6667  6669  27900  28900  29900  29901  

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External Resources
SANS Internet Storm Center: port 6668

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.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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