With the rapid development of computer technology and the increasing popularity of computer applications, computer viruses are constantly inn
With the rapid development of computer technology and the increasing popularity of computer applications, computer viruses are constantly innovating. At present, virus has become an important problem that puzzles computer system security and network development. Management departments in all walks of life should enhance their awareness of computer virus prevention and minimize the harm caused by computer viruses. Below I will share with you the harm and prevention of computer viruses. Welcome to read:
First, the classification of computer viruses
In short, computer virus is a self-replicating computer program, which can affect the normal execution of computer software and hardware and destroy the correctness and integrity of data. There are many kinds of computer viruses, and different kinds of viruses have different characteristics. Some mainly infect files, and some mainly infect the system boot area. Most viruses are just a joke, but a few viruses are extremely harmful, which requires people to adopt appropriate methods to classify viruses to further meet the needs of daily operation.
1. Classification by infection mode. According to the infection mode, it can be divided into three types: boot virus, archive virus and mixed virus. Bootable virus mainly infects the boot area of the disk. When the disk containing the virus is started, the system spreads and generally does not infect the disk files. Generally, file virus only infects executable files and exe files on disk, which is characterized by attaching to normal program files and becoming the shell or part of program files. The mixed virus has the characteristics of the above two viruses, and infects the boot area and files at the same time, thus expanding the transmission route of this virus.
2. Classification by connection mode. The classification of connection methods can be divided into three types: original code virus, intrusion virus and operating system virus. Among them, the source code virus mainly attacks the source program written in high-level language, and it will insert itself into the system source program, compile it with the source program, and connect it into an executable file, thus causing the executable file just generated to be directly infected; Invasive viruses use themselves to replace some departmental functions of the operating system, which is harmful.
3. Classification by program execution platform. Viruses can be divided into DOS virus, Windows virus, WindowsNT virus and OS/2 virus according to the program execution platform. They are viruses that attack DOS, Windows9X, WindowsNT, OS/2 and other operating system platforms respectively.
Four new viruses. Because of its uniqueness, some new viruses can not be classified according to the previous types, such as macro viruses, viruses written in the macro programming language of an application, hacker software, e-mail viruses and so on.
Second, the harm of computer viruses
The normal office computer of our labor and social security department stores a large number of important data and information such as documents, business data, official documents and archives. If it is destroyed by virus, hacked or tampered with, data and information will be lost or even leaked, which will seriously affect the smooth progress of normal office. After the computer is infected with the virus, the execution speed obviously slows down and crashes frequently. In addition, files are deleted, the hard disk partition slot table is destroyed, and even the hard disk is illegally formatted. What's more, it will cause computer hardware damage, which is difficult to repair. Many webpages contain malicious code viruses, which attract people to visit their webpages with attractive webpage names, and then modify the home page of IE browser of visitors' computers and set it as their webpages. To make matters worse, Trojan horse will be placed in the system file of the guest computer and loaded together with the system startup, so it is difficult to modify the home page. To make matters worse, you can't modify the login file by modifying the operating system and logging out. In addition, the virus intelligence program is quite high. After infection, the anti-virus program was killed, which led to the failure of anti-virus software. The infection mode changed from early passive infection to active infection today.
Third, the protection of computer viruses.
How can we reduce and avoid the infection and harm of computer viruses in our normal work? As long as we pay attention to the following aspects in our daily computer use, the chances of being infected with the virus will be greatly reduced.
Establish good safety habits. For example, don't open some emails and attachments of unknown origin, and delete them as soon as possible. Don't go to websites you don't know much about, especially those with attractive names. Don't open them easily. Don't run the non-antivirus software downloaded from the Internet. These necessary habits will make your computer safer.