My firewall is BlackIce Defender. Whenever somebody attacks my computer, it reports all information it can about the attacker to me. Additionally, it will give me the option to click on an 'advice' button. This then opens a website which will inform me about how to report this intruder to the proper people (i.e. thier system administrator). I don't know if your firewall supports this feature, but this one does.
As for that Sub7 thing. I say, if you really have a bad feeling about having a Sub7 Trojan, backup all your files and reformat your HDrive and reinstall your OS. Its always a good thing to do every now and then anyway. ALSO, be sure to scan your backup with a newly updated Virus Scanner before copying them back to your newly installed OS.