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> Ports commonly used by trojan programs    
post Oct 23 2003, 10:36 AM

UA Admin + Auntie Virus
Posts: 2,671
Joined: 15-July 02
From: USA

Your firewall is telling you a certain port on your system is attempting to connect out or in. You've never seen this alert before and don't know why a connection is being attempted. Could it be a trojan program on your computer? Or is it a legitimate program requesting the connection?

If you're worried it might be a trojan program, you can check one of the following lists of common ports used by trojan programs. Of course, the first line of defense is an updated antivirus program, but antivirus programs don't catch all trojan programs all the time. These lists will help you in identifying potential problems not picked up by your antivirus software.

Neohapsis offers a list sorted by port number. Simovits also has additional lists that can help with trojan discovery.


These lists may not cover brand new or obscure trojan programs or trojan programs custom-written for a specific attack, but they do seem to cover most of the common ones.
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