What is the main source of computer virus?

It is an artificial, destructive, infectious and latent program that destroys computer information or systems. It does not exist independently, but is hidden in other executable programs.

After the virus in the computer, it will affect the running speed of the machine, and then it will crash and destroy the system; Therefore, the virus has brought great losses to users. Usually, we call this destructive program a computer virus.

1. Common viruses: USB flash drives, email attachments, files, etc. , infectious after opening;

2. Worms: spread through network and system vulnerabilities;

3. Trojan virus: disguised games or commonly used software.

Extended data

Characteristics of computer viruses:

1, fertility rate

Computer viruses can replicate like biological viruses. When a normal program runs, it will also copy itself. Whether it has the characteristics of replication and infection is the first condition to judge whether a program is a computer virus.

2. harmful

After computer poisoning, normal programs may not run, and files in the computer may be deleted or damaged to varying degrees. Destroy the boot sector and BIOS, and destroy the hardware environment.

3. Infectious

Computer virus infectivity means that computer viruses infect their own copies or variants to other non-toxic objects by modifying other programs, which can be a program or a part of the system.

Step 4 lurk

Latency of computer virus refers to the ability of computer virus to attach to other media for parasitism. The invading virus will not attack until the conditions are ripe, which will slow down the computer.

5, concealment

Computer viruses have strong concealment, and a few of them can be detected by virus software. Hidden computer viruses are sometimes hidden and changeable, so it is very difficult to deal with them.

People who write computer viruses usually set some trigger conditions for virus programs, such as a certain time or date of the system clock, the system running some programs and so on. Once the conditions are met, computer viruses will "attack" and destroy the system.

Baidu Encyclopedia-Computer Virus