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Port 6789 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
6789 tcp trojans W32.Netsky.T@mm (06.27.2004) - a Netsky variant that uses its own SMTP engine to email itself. It has backdoor and DoS (Denial of Service) capabilities. Listens on port 6789/tcp to receive and execute a file from an attacker.

The W32.Netsky.S@mm variant opens this port as well.

Doly Trojan also uses port 6789 (TCP).

Multiple buffer overflows in the DB2 JDBC Applet Server (DB2JDS) service in IBM DB2 9.x and earlier allow remote attackers to execute arbitrary code via a crafted packet to the DB2JDS service on tcp/6789 and cause a denial of service via an invalid LANG parameter or a long packet that generates a "MemTree overflow."
References: [CVE-2007-2582], [BID-26010]
6789 tcp Datalogger Support Software Campbell Scientific Loggernet Software (unofficial) Wikipedia
6789 tcp,udp smc-https SMC-HTTPS IANA
6789 tcp ibm-db2-admin dB2 Web Control Center SANS
6789 tcp ibm-db2-admin IBM DB2 Nmap
6789 tcp threat W32.Netsky Bekkoame
6 records found
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Related ports: 6786  6787  6788  

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External Resources
SANS Internet Storm Center: port 6789

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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