How Viruses work in Computer-3

         Virus is the worst enemy of a system that can cause multiple damages to it and sometime may prove fatal for the entire system. If you don’t take care of the issue properly it is quite possible that you have to spend a lot of money to get a new one, which seems impossible sometime. If a system acquire virus, there is huge possibility that you loss all your necessary information as drive or software can often crash due to virus attack. This is a very common issue that you often face; however there are other facts as well that you should know in detail to decide how important it is to make use of anti-virus devices in a system.

Damages:

Computer virus can do something more than what you think. Every single document that has been stored in the hard drive will lost forever if you don’t free your system of virus. Losing personal information is a nightmare and it can ruin a project or your entire effort in just a few a minute. You can buy a new computer, but it is quite impossible to get back all those important documents once they are lost from the system.

A few people believe that using antivirus is not a mandatory task when you are using a PC. However, they must remember that total system failure is another issue and most of the time virus seems responsible for this incident. It can happen to both PCs and several desktops as well.

Virus also gets access to e-mails and often interrupts the process of net surfing in many ways. All your personal contacts and related information get exposed to public due to virus attack. If a system gets victim of virus it can affect other systems as well and this scenario is quite common in the offices as a huge number of systems are in use their.

As computer viruses are of different type, individual virus affects a system in individual ways:

• As these viruses go the server, it works very slowly.
•  This type of virus generates IP address randomly and sends those IP address automatically
• If that particular IP address is computer running and is copy of SQL server, the system will fire that virus off to different other haphazard IP addresses. This kind of virus can affect your system in only 10 minutes.

Buffer Overflow:

Buffer overflow is also a result of virus attack that affects a system very badly. The virus take advantage of an overflow susceptibility in an IIS servers and can self- replicate it by exploiting the same susceptibility in different other MS IIS machines. When a virus affected system receive excessive information it can’t handle them and become a victim of buffer overflow. Due to buffer overflow, a system often shuts down, which is not only embarrassing, but also an irritating situation as well.

"However, if you make use of proper anti-virus system you can keep all these issues at bay"

How Viruses work in Computer-2

Virus Origins

Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person.

Unlike a cell, a virus has no way to reproduce by itself. Instead, a biological virus must inject its DNA into a cell. The viral DNA then uses the cell's existing machinery to reproduce itself. In some cases, the cell fills with new viral particles until it bursts, releasing the virus. In other cases, the new virus particles bud off the cell one at a time, and the cell remains alive.

Similar to the way a biological virus must hitch a ride on a cell, a computer virus must piggyback on top of some other program or document in order to launch. Once a computer virus is running, it can infect other programs or documents. Obviously, the analogy between computer and biological viruses stretches things a bit, but there are enough similarities that the name sticks.

People write computer viruses- A person has to write the code, test it to make sure it spreads properly and then release it. A person also designs the virus's attack phase, whether it's a silly message or the destruction of a hard disk. Why do they do it?

There are at least four reasons. 

The first is the same psychology that drives vandals and arsonists. Why would someone want to break a window on someone's car, paint signs on buildings or burn down a beautiful forest? For some people, that seems to be a thrill. If that sort of person knows computer programming, then he or she may funnel energy into the creation of destructive viruses.

The second reason has to do with the thrill of watching things blow up. Some people have a fascination with things like explosions and car wrecks. When you were growing up, there might have been a kid in your neighborhood who learned how to make gunpowder. And that kid probably built bigger and bigger bombs until he either got bored or did some serious damage to himself. Creating a virus is a little like that -- it creates a virtual bomb inside a computer, and the more computers that get infected, the more "fun" the explosion.

              

The third reason involves bragging rights. Sort of like Mount Everest -- the mountain is there, so someone is compelled to climb it. If you are a certain type of programmer who sees a security hole that could be exploited, you might simply be compelled to exploit the hole yourself before someone else beats you to it.

And then there's cold, hard cash. Viruses can trick you into buying fake software, steal your personal information and use it to get to your money, or be sold on the digital equivalent of the black market. Powerful viruses are valuable -- and potentially lucrative -- tools.

Of course, most virus creators seem to miss the point that they cause real damage to real people with their creations. Destroying everything on a person's hard disk is real damage. Forcing a large company to waste thousands of hours cleaning up after a virus attack is real damage. Even a silly message is real damage because someone has to waste time getting rid of it. For this reason, the legal system continues to develop more rigorous penalties for people who create viruses.

" Let's talk more about this in next article"