Back door trojans are the most dangerous type of trojans for the simple reason that they allow a malicious hacker to gain remote access to your computer via the internet. These kind of trojan unfortunately is the most common. Infected PCs are open to external control in the same fashion as lega remote admin programs used by your companies IT administrators.

Thus, since they are legal, it makes them hard to detect.

Once backdoor trojans gain a foot hold access to your computer, your system and privacy are compromised and very often go undetected.user's knowledge; often the backdoor will not be visible in the log of active programs.

Once a remote administration utilitiy has been successfully installed and launched, the victim machine is wide open. Backdoor functions can include:

* Sending/ receiving files
* Launching/ deleting files
* Executing files
* Displaying notification
* Deleting data
* Rebooting the machine

With the ability to detect and download confidential information, execute malicious code, destroy data, include the machine in bot networks and so forth, backdoor trojans combine the functionality of most other types of Trojans in one package. More harmful trojans like keyloggers that detect passwords and credit card details can be also monitored.

Backdoors have one especially dangerous sub-class: variants that can propagate like worms. The only difference is that worms are programmed to propagate constantly, whereas these 'mobile' backdoors spread only after a specific command from the 'master'.

Trojan Prevention is always better then cure. Early prevention will prevent financial damage, identity theft and a host of other trojan related problems.

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