What is a computer virus?

Computer viruses emerge one after another, and the original computer viruses are complicated enough, not to mention variants, and even less clear. In fact, as long as we master the naming rules of some viruses, we can judge some characteristics of viruses by the virus names appearing in the anti-virus software reports. Let me tell you something about it.

Classification of computer viruses

1, system virus

The prefixes of system viruses are: Win32, PE, Win95, W32, W95, etc. The general feature of these viruses is that they can infect *. Exe and *. Dll files of windows operating system and spread through these files. Such as CIH virus.

2. Worm virus

Bug beginning: bug. This virus is characterized by spreading through network or system vulnerabilities, and most worms have the characteristics of sending toxic emails to the outside and blocking the network. For example, the shock wave * * * blocked the network * * *, and the small postman * * * sent toxic mail * * * and so on.

3. Trojan virus and hacker virus

The prefix of Trojan virus is Trojan, and the prefix of hacker virus is generally hack. Trojan horse virus has the characteristics of entering the user's system through network or system vulnerabilities and hiding, and then revealing the user's information to the outside world, while hacker virus has a visual interface and can remotely control the user's computer. Trojan horse and hacker virus often appear in pairs, that is, Trojan virus is responsible for invading users' computers, and hacker virus will be controlled by Trojan virus. Now these two types are more and more integrated. General Trojan, such as QQ message tail Trojan. QQ3344, you may encounter more online game Trojan virus, such as Trojan. LMIR。 PSW.60. I would like to add here that virus names with PSW or PWD generally indicate that the virus has the function of stealing passwords * * * These letters are generally the abbreviation of "password" in English * * * Some hacker programs such as * * * hack. Nether. Client * * * * and so on.

4. Script virus

The prefix of script virus is: script. The * * * feature of script viruses is that they are written in script language and spread through web pages, such as red code scripts. Redlof***。 Script viruses also have the following prefixes: VBS, and JS*** indicates what kind of script is written * * *, such as Happy Hour ***VBS. Happytime***， 14th * * JS。 Two weeks. C.s * * * and so on.

5. Big virus

In fact, macro virus is also a kind of instruction code virus. Because of its particularity, it is listed as a separate category here. The prefix of macro virus is: macro, and the second prefix is: Word, Word97, Excel, Excel97*** and maybe one of other * * *. Any virus that only infects WORD97 and previous versions of WORD files takes Word97 as the second prefix, and the format is: macro. WORD97 All viruses that only infect WORD files after WORD97 adopt Word as the second prefix, and the format is: macro. Word Any virus that only infects EXCEL97 and EXCEL files before, takes Excel97 as the second prefix, and the format is: macro. EXCEL97 Any virus that only infects EXCEL files after EXCEL97 takes Excel as the second prefix and the format is macro. Excel and so on. The * * * feature of this kind of virus is that it can infect a series of OFFICE files, and then spread through common templates of OFFICE, such as the famous Melissa * * * macro. Melissa ** *.

6. Backdoor virus

The prefix of backdoor virus is: backdoor. This kind of virus is characterized by spreading through the network, opening the back door to the system and bringing security risks to users' computers.

7, virus planting program virus

This kind of virus is characterized by releasing one or several new viruses from the body into the system directory when it is executed, and the released new viruses will cause damage. Such as: glacier sower * * dripper.binghe2.2c * * *, MSN shooter * * dripper.worm.smibag * * * and so on.

8, destructive program virus

The prefix of destructive program virus is: harm. This kind of virus is characterized by beautiful icons to lure users to click. When a user clicks on this kind of virus, it will directly damage the user's computer. Such as: formatted disk C * * harm.formatc.f * * *, killer command * * harm.mand.killer * * *, and so on.

9, joke virus

The prefix of joke virus is: joke. Also known as prank virus. The * * * feature of this kind of virus is that there are beautiful icons to lure users to click. When a user clicks on this virus,