Virus
The computer virus – is a specially written small program that can “attribute” itself to other programs (i.e. to “infect” them), and also to carry out various undesirable actions on the computer. The program that contains any virus is known as “infected” program. When such program begins work at first management receives a virus. The virus finds and “infects” other programs, and also carries out any harmful actions (for example, spoils files or the table of placing of files on a disk, “litters” operative memory etc.). To mask a virus action on infection of other programs and harm drawing can be carried out not always, and, can be told, only in some certain conditions. After the virus has executed the actions necessary to it, it transfers control to the program it lives in, and it works the same way as usually. That is why the work of the infected program looks the same as the work of not infected.
Many versions of viruses are arranged so that at the beginning of the infected program the virus remains not noticed, i.e. before operating system reboot, in memory of the computer and from time to time infects programs and carries out harmful actions on the computer.
All actions of a virus can be carried out quickly enough and without delivery of any messages, therefore it is very difficultly for user to notice that there is something unusual in the computer.
While few programs are infected on the computer, virus presence can be almost imperceptible. However after some time something strange begins to happen on the computer, for example:
• some programs cease to work or start to work incorrectly;
• extraneous messages, symbols etc. are deduced on the screen;
• work on the computer is essentially slowed down;
• some files appear to be spoiled etc.
By this moment, as a rule, it is already a lot of (or even the majority) those programs which you use, are infected with a virus, and some files and disks are spoiled. Moreover, the infected programs from your computer could be already transferred by means of external carriers or on a network on other computers.
Some versions of viruses behave even more artfully. They imperceptibly infect in the beginning a great number of programs or disks, and then cause very serious damages, for example, they format the whole hard disk on the computer. And there are viruses which try to behave as more as possible imperceptibly, but gradually and gradually spoil the data on the hard disk of the computer.
Thus, the computer can be very serious if not to undertake measures on protection against viruses. For example, in the beginning of 1989 the virus written by American student Morrisom, had been infected and put out of action thousand of computers, including belonging to the Ministry of USA Defence. The author of that virus has been sentenced by court to three months of prison and the fine of 270 thousand dollars. Punishment could be even stricter, but the court has considered that the virus did not spoil the data but only bred it.
It is necessary to notice that to write a virus is not a difficult task and can be made by a student studying programming. More and more new viruses appear every day in the world…
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