System security Describe the potential impact of four different threats - Virus, Trojans,Worms and Phishing.

Trojans

The Trojan has to get to your computer and it’s usually done by an infected email or downloads and sometimes by CD or DVD. Often emails look like a typical joke or news email that a friend would send. But when you click on the link in the newsletter, it will take you to an infected website and install a Trojan once you viewed the webpage.

Trojans work by carrying programs in the files you downloaded from the email or a device. These programs allow someone (a hacker) to have a complete access to your computer. Trojan often destroys your computer functionality and that way it allows the hacker to use your computer and you don’t know what he is doing. Hackers use Trojans to open backdoors to your computer and that way they have access to all your files on your computer and even they can access your network.

Very complexes Trojans can install a dialler and that way they can use your modem which could end up with a big phone bill.

Worms

Worm is like a virus but it doesn’t need to attach itself to a different program. There are two types of worms active and passive. Active worms transport them self without any help from human action were as a passive worm needs a human to transport themselves from one place to another.

Worms use a code called payload which is designed to spread and delete files on the computer. They can also install backdoor in the infected computer order to allow it to be used to attack other computers or websites.

Phishing

Phishing is a way to stealing identity information by using your trust. Usually you receive a fake email from a bank or something similar asking you to fill in a form were you give your details. These details may then be used to steal your money from your bank account or to access your computer or personal information. This can cause you to bankrupt if you give your details to the wrong person.