I'd say fuck it and report it to the ISP in question. Send a log file showing the IP in question and the activity they tried to do. However, if it was just an isolated incident with a trojan horse or something stupid like that, let it go... it's prob. a dumb kid who will get himself into deeper trouble one day. As a side note, before you try to hack anybody else, you should scan your own system's vunerability... it will secure your 'puter and also give you a better understanding of network security and backdoors.