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Port 6666 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
6666 tcp,udp irc IRC (Internet Relay Chat)

Some TechniColor routers allow for SSH connections on this port using root/root as login.

Many trojans/backdoors also use this port: Dark Connection Inside, Dark FTP, Host Control, NetBus worm , ScheduleAgent, SubSeven, Trinity, WinSatan, Vampire, TCPshell.c.
Backdoor.IRC.Flood [Symantec-2001-080313-3306-99]
Backdoor.Hacarmy.E [Symantec-2004-101417-2331-99]
W32.Spybot.EAS [Symantec-2004-093016-3632-99] - DDoS and backdoor capabilities, also attempts to steal confidential info. Uses port 6667/tcp.
Backdoor.Sdbot.AC [Symantec-2004-100415-4933-99] - backdoor trojan, uses port 6667/tcp.
Backdoor.Sdbot.AF [Symantec-2004-111811-0117-99] - backdoor trojan, uses port 6667/tcp.
Backdoor.Alnica [Symantec-2004-110315-5443-99] - backdoor trojan, uses port 6667/tcp to connect to IRC, also sends ICQ messages.
Backdoor.Maxload [Symantec-2004-110420-4659-99] - backdoor trojan, affects Linux and Unix computers ! Attempts to connect to IRC servers on port 6667/tcp.
Backdoor.Hacarmy.E [Symantec-2004-101417-2331-99] - backdoor trojan, uses port 6667/tcp.
Backdoor.Hacarmy.F [Symantec-2004-110511-0258-99] - backdoor trojan, connects to IRC servers on port 6667/tcp.
W32.Bofra.A@mm [Symantec-2004-110916-0038-99] - uses ports 1639 and 6667/tcp.
W32.Bofra.E@mm [Symantec-2004-111213-5143-99] - 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 [Symantec-2005-012811-2022-99] - IRC bot worm with backdoor capabilities. Uses port 6667, propagates through network shares.
Backdoor.Lateda.B [Symantec-2005-011714-4950-99] - backdoor trojan with remote access capabilities. Connects to an IRC server on port 6667, opens a backdoor on port 9999/tcp.
W32.Linkbot.M [Symantec-2005-052109-2651-99] - opens a backdoor on port 6667/tcp. Also listens on port 113/tcp.
W32.Zotob.D [Symantec-2005-081609-4733-99] - 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 [Symantec-2005-081717-2017-99] - 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.

Verint 5620PTZ Verint_FW_0_42 and Verint 4320 V4320_FW_0_23, and V4320_FW_0_31 units feature an autodiscovery service implemented in the binary executable '/usr/sbin/DM' that listens on port TCP 6666. The service is vulnerable to a stack buffer overflow. It is worth noting that this service does not require any authentication.
References: [CVE-2020-24055]

Backdoor.Win32.FTP.Lana.01.d / Weak Hardcoded Password - The malware listens on TCP port 6666. The credentials "user" and "pass" are weak and stored in plaintext with the executable.
References: [MVID-2022-0468]

Backdoor.Win32.FTP.Lana.01.d / Port Bounce Scan (MITM) - the malware listens on TCP port 6666. Third-party intruders who successfully logon can abuse the backdoor FTP server as a man-in-the-middle machine allowing PORT Command bounce scan attacks using Nmap. This vulnerability allows remote attackers to abuse your system and discreetly conduct network port scanning. Victims will then think these scans are originating from the infected system running the afflicted malware FTP Server and not you.
References: [MVID-2022-0469]

Backdoor.Win32.Kilo.016 / Denial of Service (UDP Datagram) - the malware listens on TCP ports 6712, 6713, 6714, 6715, 7722, 15206, 15207, 16712 and UDP 6666. Attackers who can reach an infected host can send a large payload to UDP port 6666 causing a disruption in service.
References: [MVID-2022-0546]
6666 tcp trojan AL-Bareki, KiLo, SpArTa Trojans
6666 udp trojan KiLo Trojans
6666 tcp DarkConnectionInside [trojan] Dark Connection Inside SANS
6666 tcp DarkConnection [trojan] Dark Connection SANS
6666 tcp irc-serv internet relay chat server SANS
6666 tcp ircu IRCU SANS
6666 tcp NetBusworm [trojan] NetBus worm SANS
6666 tcp TCPShell.c [trojan] TCPShell.c SANS
6666,20013 tcp,udp applications Dark and Light Portforward
2213,6666 tcp,udp applications KALI Portforward
6666 tcp irc internet relay chat server Nmap
6666 tcp threat AltaVista Tunnel server also uses this port. Bekkoame
6666 tcp threat BAT.Boohoo.Worm Bekkoame
6666 tcp threat Foobot Bekkoame
6666 tcp threat Many sites running "napster" may use this port. Bekkoame
6666 tcp threat Script kiddies trying to compromise Real Server servers might mistakenly use this port. Bekkoame
6666 tcp threat W32.HLLW.Warpigs Bekkoame
6666 udp threat Kali uses UDP 6666. Bekkoame
6665-6669 tcp Internet Relay Chat (official) Wikipedia
6665-6669 tcp ircu IRCU IANA
6665-6669 udp Reserved IANA
22 records found
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Related ports: 3783  6500  6515  6660  6661  6662  6663  6664  6665  6667  6668  6669  23023  

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External Resources
SANS Internet Storm Center: port 6666

Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates 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 and realtime gaming, 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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