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Once loaded, the Trojan can steal files stored on the hard disk, and it can then transmit them back to the hacker. If hackers can't physically access a targeted computer, they can sometimes trick a victim into loading the Trojan under the guise of a game or utility program. The hacker can then retrieve the saved passwords and use them to access other people's accounts.

When an unsuspecting victim comes along and types a password, the Trojan stores the password and displays a message like 'Computer down' to convince this person to go away or try another machine. For example, if a school computer requires a password before anyone can use it, a hacker can install a program that looks like the log-in screen, asking the user to type in a password. Hackers often build custom Trojans to gain unauthorized access to a computer. One of the most common uses for a Trojan horse is to steal passwords. Trojans that steal passwords and other sensitive information Once executed, the Trojan wipes out every file from your hard drive and then displays 'Bad Command or file name' along with an obscene message. Attached to the email message was the archive file named AOL4FREE.COM, which claimed to provide the original AOL4FREE program for allowing access to America Online for free. Inevitably, someone actually wrote a Trojan horse, called it AOL4FREE, and on March 1997, began distributing it to America Online users by email. He immediately shut down his computer, but it was too late. Within seconds of opening it, a window appeared and began to display all his files that were being deleted.

A few hours ago, someone opened an Email that had the subject heading of 'AOL4FREE.COM'. It is essential that this problem be reconciled as soon as possible. Immediately following news of the AOL4FREE program, someone started a hoax, warning that the AOL4FREE program was actually a Trojan horse:Īnyone who receives this must send it to as many people as you can. In 1995, a Yale student named Nicholas Ryan wrote a program called AOL4FREE, which allowed users access to America Online without having to pay the normal subscriber fee.

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