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Port 3127 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
3127 tcp worm W32.Novarg.A@mm - mass-mailing worm with remote access trojan, 01.2004. Affects all current Windows versions. A.K.A W32/Mydoom@MM.
When a computer is infected, the worm will set up a backdoor into the system by opening TCP ports 3127 through 3198, compromissing the entire system.

W32.HLLW.Deadhat (2004.02.06) - a worm with backdoor capabilities. It attempts to uninstall the W32.Mydoom.A@mm and W32.Mydoom.B@mm worms, and then it spreads to other systems infected with Mydoom. Also, it spreads through the Soulseek file-sharing program.

Some other trojans using this port: W32.HLLW.DoomJuice, W32.MockBot.A, Moody.Worm, W32.DoomHunter, W32.SoLame.A, W32.Welchia.D
3127 tcp,udp ctx-bridge CTX Bridge Port IANA
3127 tcp mydoom W32/MyDoom, W32.Novarg.A backdoor SANS
3127 tcp,udp threat W32.Mockbot Bekkoame
3127 tcp,udp threat W32.Solame Bekkoame
3127 tcp,udp threat Novarg(Mydoom) Bekkoame
3127 tcp,udp threat W32.HLLW.Deadhat Bekkoame
3074-3174 udp applications Rainbow Six Vegas Portforward
8 records found
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Related ports: 1080  2766  3128  

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External Resources
SANS Internet Storm Center: port 3127

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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