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Trojans can be malware programs that install along with more attractive titles. For example, that great free software program you got from that dodgy website? It may well be the program you wanted. But someone (usually a 3rd party) may well have attached a Trojan to it. The Trojan will be installed as well as the software you wanted.

Trojans are not viruses, in the sense that they don’t replicate or send copies of themselves to others. They are just another software program that can be installed on your computer, albeit a nasty one!

SO what do trojans do? A Trojan can be very malicious indeed. Most of them are intent on controlling your PC. These are called Remote Access Trojans, or RATs for short. If someone has placed a Trojan on your computer, they’ll be able to see everything that you can. Some of them can even control your web cam. That means the attacker can see you! If you have speakers attached to the PC, they can even hear you!

If that weren’t bad enough, the attacker will have access to your computer, enabling him to upload nasty things to your PC. After all, why should he store these things on his computer when he has access to yours?

Most trojans nowadays are placed on your computer by hackers or criminals. If you type your credit card details in to a website, for example, then the attacker can record what you type. If a criminal has control of a lot of computer, he could also launch something called a Denial of Service attack. A DoS attack is when a lot of malicious computers attack a particular network or website. The network has so many request that it can’t cope, so has to shut down. The criminals then blackmail the owner (”We’ll let you have your site back if you give us money”.) Many gambling sites have been hit by this type of attack.A Trojan can also disable your security software, leaving you wide open on the internet.

So how do trojans get on my computer?
If you have an unpatched version of a Windows operating system (XP, ME, W98, etc) that is allowed on the internet then you have a very high chance of becoming infected. Install Service pack 2 as matter of urgency. And get all the other Windows updates. If you browse using Internet Explorer then be aware that it is notorious for being unsecured. (At one stage, it was known as the Swiss Cheese browser because it had so many holes in it!) even with all the latest patches, someone is always trying to find a new hole in Internet Explorer. If an attacker can guide you to a particular website, then your browser’s security holes can be a way for them to load programes onto your PC. A lot of people have switched to using a browser other than Internet Explorer, the most popular choice being Firefox. But Trojans can get on to your PC many other ways: email attachments, software/music downloads, unsafe Instant Message clients, IRC, Peer 2 peer downloads, open ports not protected by a firewall, etc.

Just because you have anti virus software does not mean you are necessarily protected from Trojans. The best thing to do is to constantly scan your computer with programs like MalewareBytes or ComboFix. You can get these software freebies by doing a google search or yahoo search.

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