Bypassed software firewall?

Is it possible for a hostile thing such as a Trojan etc, to get onto a machine, define its own internet or network connection and bypass a software resident firewall ? Please exclude replies where the hostile content disables the firewall as this is common of many trojans etc . This is well know Also exclude replies where an inept user allows such thing through .

.. I mean only something that renders the firewall useless by bypassing it or renderubg it in-effective . If so, What can I do to prevent this ? What can be done to discover this ? short of a re-installation of the OS?

Thanks in advance

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Posted 5 years ago by johnny in Networking Firewalls

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