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Port 9996 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
9996 tcp trojans W32.Sasser.Worm - remote access trojan, 05.2004. Affects all current Windows versions, attemts to exploit a vulnerability addressed in Microsoft Security Bulletin [MS04-011]. There are some issues associated with using the [MS04-011] update discussed here: MS KB 835732.

Trojan runs a FTP server on port 5554 on infected systems and attempts to connect to random IPs on TCP port 445. If a connection is established, the worm sends shellcode to that computer which may cause it to run a remote shell on TCP port 9996. The worm then uses the shell to cause the computer to connect back to the FTP server on port 5554 and retrieve a copy of the worm.

W32.dabber.a trojan also uses this port.

Football Manager Live also uses port 9996 (TCP/UDP).
9996 tcp,udp threat W32.Sasser Bekkoame
9996 tcp,udp palace-5 Palace-5 IANA
9990-9999 tcp applications DOT.TUNES Portforward
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Related ports: 445  5554  9920  9995  9997  9998  9999  

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External Resources
SANS Internet Storm Center: port 9996

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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