Part of the problem with browser hijacking is some of the more unscruplous sites implant a trojan or other spyware into thier code. Their site is encoded with these types of hijackers, making it nearly impossible to be detected while on the site. At times this doesn't show until the machine is restarted. Many firewalls do not detect this 'secret' install. Now that it has become a real problem, more firewalls and spyware/adware programs are adding this info and alerting one to the hijacking. As far as checking ports to make sure that they are all in 'stealth' mode, while a neccessity for security, isn't a deterent to being hijacked!
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