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Port 31337 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
31337 tcp,udp Back Orifice This port number means "elite" in hacker/cracker spelling (3=E, 1=L, 7=T) and because of the special meaning is often used for interesting stuff... Many backdoors/trojans run on this port, the most notable being Back Orifice.

Here are some others that run on the same port: Back Fire, Baron Night, Beeone, BO client, BO Facil, BO spy, BO2, cron / crontab, Freak88, Freak2k, icmp_pipe.c, Sockdmini, ADMworm, bindshell, Elite, Gummo.

Buffer overflow in the Private Communications Transport (PCT) protocol implementation in the Microsoft SSL library, as used in Microsoft Windows NT 4.0 SP6a, 2000 SP2 through SP4, XP SP1, Server 2003, NetMeeting, Windows 98, and Windows ME, allows remote attackers to execute arbitrary code via PCT 1.0 handshake packets.
References: [CVE-2003-0719]

aMSN (aka Alvaro's Messenger) 0.96 and earlier allows remote attackers to cause a denial of service (application crash) by sending invalid data to TCP port 31337.
References: [CVE-2007-2195] [BID-23583] [OSVDB-39116]

Stack-based buffer overflow in the pr_ctrls_recv_request function in ctrls.c in the mod_ctrls module in ProFTPD before 1.3.1rc1 allows local users to execute arbitrary code via a large reqarglen length value.
References: [CVE-2006-6563], [EDB-3333], [EDB-3330], [BID-21587]

Backdoor.Win32.Small.vjt / Unauthenticated Remote Command Execution - the malware listens on TCP port 31337. Third-party attackers who can reach the system can execute OS commands or programs further compromising the already infected machine.
References: [MVID-2021-0337]

.Net Remoting, Terraria, ncat, a netcat alternative

Eldim is a secure file upload proxy (IANA official)
31337 tcp Back Orifice - remote administration tool (often Trojan horse) (unofficial) Wikipedia
31337 tcp trojan ADM worm, Back Fire, Back Orifice (Lm), Back Orifice russian, BlitzNet, BO client, BO Facil, BO2, Freak88, Freak2k, NoBackO Trojans
31337 udp trojan Back Orifice, Deep BO Trojans
31337 tcp ADMworm [trojan] ADM worm SANS
31337 tcp BackFire [trojan] Back Fire SANS
31337 tcp BackOrifice1.20patches [trojan] Back Orifice 1.20 patches SANS
31337 tcp BackOrifice(Lm) [trojan] Back Orifice (Lm) SANS
31337 tcp BackOrificerussian [trojan] Back Orifice russian SANS
31337 tcp BaronNight [trojan] Baron Night SANS
31337 tcp Beeone [trojan] Beeone SANS
31337 tcp bindshell [trojan] bindshell SANS
31337 tcp BO2 [trojan] BO2 SANS
31337 tcp BOclient [trojan] BO client SANS
31337 tcp BOFacil [trojan] BO Facil SANS
31337 tcp BOspy [trojan] BO spy SANS
31337 tcp cron/crontab [trojan] cron / crontab SANS
31337 tcp DeepBO [trojan] Deep BO SANS
31337 tcp Elite Sometimes interesting stuff can be found here here SANS
31337 tcp Freak2k [trojan] Freak2k SANS
31337 tcp Freak88 [trojan] Freak88 SANS
31337 tcp Gummo [trojan] Gummo SANS
31337 tcp icmp_pipe.c [trojan] icmp_pipe.c SANS
31337 tcp LinuxRootkitIV [trojan] Linux Rootkit IV SANS
31337 udp BackOrifice cDc Back Orifice remote admin tool SANS
31337 udp BackOrifice [trojan] Back Orifice SANS
31337 tcp Elite Sometimes interesting stuff can be found here Nmap
31337 udp BackOrifice cDc Back Orifice remote admin tool Nmap
31337 udp BackOrifice [trojan] cDc Back Orifice remote admin tool Neophasis
31337 tcp psybnc [trojan] psybnc Neophasis
31337 tcp threat Back Orifice Bekkoame
31337 tcp threat Emcommander Bekkoame
31337 tcp threat Sockdmini Bekkoame
31337 tcp threat W32.HLLW.Gool Bekkoame
31337 udp threat Back Orifice Back Orifice is a backdoor program that commonly runs at this port. Scans on this port are usually looking for Back Orifice. Bekkoame
31337 udp threat Deep BO Bekkoame
31030-31399 tcp,udp Unassigned IANA
37 records found
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Related ports: 1337  

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External Resources
SANS Internet Storm Center: port 31337

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.

Please use the "Add Comment" button below to provide additional information or comments about port 31337.
  User Reviews/Comments:
by anonymous - 2015-07-13 19:51
RedPhone is using TCP port 31337 for call initiation.
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