Firewalls: What am I seeing? is an excellent must-read FAQ on what kind of probes you may be seeing on different ports.

Trojan Port Lists

• Trojan list database with many different sorting options
• Jerry Latham's Trojan Ports List
• Denial of Service Help: Trojan Ports to Block hyperlinked port list
• ONCTek List of possible Trojan/Backdoor port activity
• Commonly Probed Ports
• Threats to your Security on the Internet in particular the Current list of Trojans provides an excellent description of various trojan programs
• Andrew Daviel's Internet ports, services and trojans has lots of good links
• advICE:Exploits:Ports a nice hyperlinked port list
• PestPatrol - About Ports and Trojans - A Port List

Additional Resources

• Trojan Horses: Back Orifice & Netbus
• Anti-trojan.org

Although not specific to trojan ports, you may find the port search resources from my TCP/IP Ports page to be useful.

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