Some computer viruses in history

Computer viruses usually turn hosts or other types of computers into reproducing copies of the invading organism. They spread from computer to computer via electronic bulletin boards, telecommunication systems and shared floppy disks. Virus programmers are created by man, for fun or malice, but to start as soon as they spread, they take their own life problems, creating confusion and paranoia in their wake.

If the virus into a PC, the PC must be immediately isolated, found. The virus can, as he will be an antidote for the study from viruses. The machine should be put into service only if the virus is eliminated.
Viruses

A virus is a program inserted into another program as defined. It features enabled by its hospitality program. It replicates itself and spreads to others through the transfer drive. A virus infects a program or data each time the user is infected, the program and the virus replicates and services.

There are two types of computer viruses “parasites” and “start” of the virus.

A parasitic virus lays with other programs and is activated when the host program is executed.

A boot virus is designed to fit in the boot sector of floppy disks. It works by replacing the first sector of the disk with a part of himself. It hides the rest elsewhere on the disc with a copy of the first sector. The virus is to start with the computer in the program if the machine is loaded embedded. The virus loads, installs itself, the rest is hidden, and then loads the original program. Virus on a hard drive can hold the DOS boot sector or master boot sector.
Some countries have reported virus

C-Brain: Amjad and Basit two Pakistani brothers, has developed this software in January 1986 in order to discourage people from buying illegal software at reasonable way. This virus was the most famous and never has a case of damage to millions of PCs found. This measure will remain in the boot sector of the disk or near zero. The virus enters the machine memory when the PC is booted with the infected floppy.

MacMag: This virus infects only the Apple Macintosh. Not much damage was reported due to this virus. This has not been noticed on IBM-compatible PCs. You will see a message of peace on the monitor and killed himself.

Cascade: This virus infects the computer and IBM-compatible. The letters on the screen you could see straight down fall of the screen when the virus will be presented in alphabetical order. It is a kind of parasitic virus. Putting it on other programs and activated when the host program is executed. It is with other PCs on which the programs are copied, copied.

Jerusalem: Found in 1987 at the Hebrew University, Jerusalem, the virus is designed to activate only on Friday, January 13, and delete all files on the same day executed. It infects EXE and COM files. This is comparable with the Cascade virus that is parasitic in nature. The virus binds to damage to data on COM and EXE files.

Daracrime / Columbus virus or 13 October: The virus is similar to Jerusalem and was programmed to 13 October 1989. Track zero computer hard disk is destroyed and the contents of the disk is not readable. This virus infects COM-and EXE files and damage to the hard drive. An antidote known as vcheck “was developed by the U.S. company computer. Fortunately, the virus was removed in March 1989 and was notified of the injury after October 13 minimal.

Bomb: This is also known as “Logic Bomb” and “Time Bomb”. An event triggered in a program, a program of the accident makes routine is defined as a “bomb”. In general, “bomb” is a program in a program from a person who is put into operation.