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A trojan horse is a malicious program, usually disguised as something useful or desirable. When activated, they can cause loss, damage or even theft of data. Unlike viruses and worms, Trojans do not reproduce by infecting other files nor do they self-replicate.
Trojan horses spread when people are lured into opening a program because they think it comes from a legitimate source. Trojan horses can also be included in software that you download for free. Never download software from a source that you don’t trust.
A Trojan Horse is full...
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A wormis a program that is designed to replicate and spread throughout a computer system automatically , it has the capability to travel without any help from a person. It will usually hide within files and distribute those files through any available network connections.
The biggest danger with a worm is its capability to replicate itself on your system, so rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. For example, a worm could send out copies of...
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All computer viruses need to be run in order to be activated. Once activated, a virus may replicate into only one program at a time, it may infect some randomly-chosen set of programs, or it may infect every program on the system. Sometimes a virus will replicate based on some random event or on the current value of the clock.
In general a virus performs four actions.
1. Replication: The virus inserts copies of itself into other program files. Then each time the host program is run the virus infects more files.
2. Camouflage:...
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After you open and run an infected program or attachment on your computer, you might not realize that you’ve introduced a virus until you notice something isn’t quite right. Some computer viruses alert you to their presence by putting an unexpected message on your screen.
Here are a few primary indicators that your computer might be infected:
• A sudden decline in PC or network performance. Your computer runs more slowly than normal.
• Applications on your computer don’t work correctly. Programs taking longer to start or running more...
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Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation without your knowledge and runs against your wishes. A computer virus that can make a copy of itself over and over again is relatively easy to produce. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk.
A computer virus exhibits two characteristics:
1. They are self executing....
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