Computer virus refers to the use of a special software program that can destroy the normal work of the computer. Computer viruses can tamper with normal computer programs, destroy the effective functions of these programs, and continue to invade other computers and destroy the programs of those computers.
Reproduction
A computer virus can reproduce like a biological virus. When a normal program runs, it also replicates itself. Whether it has the characteristics of reproduction and infection is the primary condition for judging that a certain program is a computer virus.
Destructive
After the computer is poisoned, the normal program may not run, and the files in the computer may be deleted or damaged to varying degrees. Usually: add, delete, change and move.
infectivity
Computer virus is not only destructive, but also infectious. Once the virus is copied or mutated, its speed is difficult to prevent.
Latent
Some viruses are like time bombs. When they attack is pre-designed. For example, the Black Friday virus can't be detected before the scheduled time. When the conditions are met, it will explode and destroy the system.
Concealment
Computer viruses have strong concealment. Some can be detected by virus software, some can't be found at all, and some are hidden and changeable. It is usually difficult to deal with such viruses. Trigger ability
The characteristic of a virus that induces the virus to infect or attack due to the occurrence of an event or value is called triggering. In order to hide themselves, the virus must lurk and do less action.
Because computer virus is also a kind of program, it also has some characteristics of computer software: it is designed and written by software programmers; It will appear in the way of computer operation according to the requirements of software specifications; It can also be stored in computer floppy disk and hard disk, and can also be transmitted through computer system or network. Using computer virus to fight is to put computer virus into the enemy's target computer through some means or ways, so that it can't work normally. The weapon systems that computer viruses can easily invade and destroy include various military information systems and various computer-controlled weapon systems.
The use of computer viruses in combat has a wide range of functions and great destructive effect. Moreover, the cost of computer virus is low and can be delivered in a variety of ways.