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Remote access Trojans

These are probably the most publicized Trojans, because they provide the attacker with total control of the victim's machine.

Examples are the Back Orifice and Netbus Trojans.

The idea behind them is to give the attacker COMPLETE access to someone's machine, and therefore full access to files, private conversations, accounting data, etc.

The Bugbear virus that hit the Internet in September 2002, for instance, installed a Trojan horse on the victims'machines that could give the remote attacker access to sensitive data.

The remote access Trojan acts as a server and usually listens on a port that is not available to Internet attackers.

Therefore, on a computer network behind a firewall, it is unlikely that a remote (off-site) hacker would be able connect to the Trojan (assuming that you have blocked these ports, of course).

HOWEVER, an internal hacker (located behind the firewall) can connect to this kind of Trojan without any problems.

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