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However, the most common way that users are infected with a Trojan program is through the spreading of it through emails. The sender will send it to the recipient within an e-mail attachment that might say something like "nudegirls.jpg" or something along those lines that will make you curious and open the file.

The computer virus variety of the Trojan Horse was first discovered in 2002 within sendmail and OpenSSH packages both included the Trojan Horse. It was done by a hijacker that broke in to the distribution sites and replaced the software along with his own damaged and infected ones. that is one way that your process can be given a Trojan, through software downloads and installation.

Another increasingly popular way that Trojan Horses have been spread to users is through the ever increasing instant messenger programs such as Yahoo Messenger, aim, ICQ, MSN messenger, and IRC. The one key to keep in mind about Trojans is that they have to be triggered by some mechanism and won't spread themselves. For example, you can have one in your e-mail but you do not open the link then it won't mess along with your process.

A Trojan Horse, five times on your process can do several things. First, it's the ability to take over your process and not give you access to any of your files. Next, it could possibly search your computer and monitor your usernames and passwords to various sites and even has the chances of getting your credit card numbers and sending all this information back to the creator.

The best way to keep your process from receiving any type of Trojan Horse is that of prevention. never open files sent you by people you have no idea because chances are that not only are these messages SPAM e-mail but will contain some kind of link or file that will generate a Trojan on your machine. it is fine to run anti-virus program on a every day basis but the fact is that Trojans are created so often that your definitions for viruses might not recognize the newest Trojans that have been created.