Nuances between virus worms and Trojans

Since the names are different, the meaning must be different.

Major threats to viruses, worms, and Trojans

With the increasing popularity of the Internet, various viruses and Trojans have become rampant. New viruses have been generated almost every day, causing great damage to Internet users, it's almost time for people to talk about changing the color of drugs.

A variety of viruses, worms, and Trojans are everywhere, making them difficult to defend against. So what are the differences between viruses, worms, and Trojans? I believe most people do not have a clear understanding of this issue. Here we will give a brief introduction.

Viruses, worms, and Trojan horses are malicious programs that can damage information on your computers and computers. They may slow down your network and operating system, seriously damage your system, and even completely damage your system, they may also use your computer to spread themselves to your friends, family members, colleagues, and other places on the Web, causing greater harm. These three types of malicious code are compiled by humans, which may cause harm to users. People often refer to them as viruses. But in fact, this naming method is not accurate. Although they share common characteristics, but there are also great differences.

What is a virus?

ComputerVirus: according to the computer information system security protection regulations of the People's Republic of China, viruses are clearly defined as "damages to computer functions or data inserted in computer programs, A group of computer commands or program codes that affect computer usage and are capable of self-replication ".

The virus must meet two conditions:

1. It must be self-executed. It usually places its own code in the execution path of another program.

2. It must be able to replicate itself. For example, it may replace other executable files with copies of files infected with viruses. Viruses can infect both desktop computers and network servers.

In addition, viruses are often highly infectious, latent, trigger, and destructive. Due to the similarities between these characteristics of computers and biological viruses, some people call this malicious program code "computer virus ". Some viruses are designed to corrupt computers by damaging programs, deleting files, or formatting hard disks. Some viruses do not damage computers, but just copy themselves, and display text, video, and audio messages to indicate their existence. Even these benign viruses can cause problems for computer users.

Usually they occupy the computer memory used by valid programs. As a result, Operation exceptions or even system crashes may occur. In addition, many viruses contain a large number of errors, which may cause system crashes and data loss. It is gratifying that, without human operations, general viruses do not spread themselves. They can only be moved together by sharing a file or sending an email. Typical viruses include Black Friday viruses.