MsMittens is right, Spoofing would hide the atackers ip and thus the ip you are atacking is the inosent victim. Often a victims computer is comprimized by a worm or trojan which is then useing the victims computer to atack others. Two wrongs dont make a right, if you suspect malicious activity by somone conecting to your computer the best thing to do is contact their isp by sending an email to [email protected] whatever their abuse email is, and inform them of the incodents.

Being sure to provide them with the unmodified logs with valid time stamps. And note your timezone, they can then compare their logs with the logs you present and determine the best cource of action. Furthermore launching an atack back may raise flags on your acount and may result in your isp terminateing your acount without any notice.



Hacking related tools such as keyloggers, viruses, trojans.. have a corosponding set of software determined to defeat these, such as anti-keyloggers, anti-trojan, antivirus, IDS systems...