virus

virus

              

A computer virus is a piece of software that was written to mimic the virus that causes the disease. There is growing Expand and spread themselves. The camouflaged hiding in a computer system. Network And various storage media





4.2 symptoms of an infected computer.
          We can observe the operation of the computer. Suspected to be infected or not. The symptoms are observed.
    4.2.1 take longer than usual to run the program.
    4.2.2 When the size of the program files paradox.
    4.2.3 Date and time of programs or data files change. But not edit or run.
    4.2.4 The size of the secondary memory, such as disk drives, Flash Diffuser (Prims) remains noticeably less. Or inability to use, for example.
    4.2.5 Status of hard drive activity light is stuck on an unusually long. Or flashing all the time, and that is not running.
    4.2.6 keyboard or mouse malfunction or not work at all.
    4.2.7 slow down your computer without cause or boot itself, and we did not order.
    4.2.8 any loss of data or programs, without knowing why.






4.3 Types of Computer Viruses

        
4.3.1 boot sector virus Bootsector Virus is a virus that lie hidden in the boot disk to be used in the so-called boot sector (Boot Sector) to access the disk, it is to wake up to the virus. working
Boot sector virus example
AntiVir is checking and hunting the bootsector viruses.

          
4.3.2 Program Executable File Virus virus is a virus that is spread by contact with program files with the file extension. Com, .exe, .sys, .dll as observed by the size of the file is bigger than ever. When the program runs, the virus was spreading.

.exe virus detection example
Avast Antivirus Software protects a malware.

           
4.3.3 Macro viruses Macro Virus
A virus that harass the program office suite such as Word, Excel, Powerpoint and will create a so-called Macro (Macro) makes use of the problem.


          
4.3.4 script virus is a virus that is a scripting language (Script), such as VB Script, Javascript which these viruses are activated when a user opens a file with the extension. Vbs or. Js is a virus and is usually spread through the. Internet

Norton AntiVirus detects a script virus.

 4.3.5 Trojan Trojan (Trojan) is a virus, spyware (Spyware) that will elicit information from our return to the programmer as your username. (Username) Password (password), or credit card numbers. (Credit cards), etc.

Virus Trojan Spyware Signpost Shows Internet Or Computer Threats.
           

4.3.6 mutant viruses It is a virus that has the ability to change their own characteristics, and so on. To avoid detection The programs are worms (Worms) that lurk and widespread script file via email and on the Internet.




3. To prevent and remove computer viruses.
1. Every time you get software that does not know the source. Or get free Or download the user should make sure before re-use.
2. Copy exchange files between machines to check all the time. Not sure, despite the anti-virus program installed on it.
3. should back up important data regularly.
4. Do not allow others to use our machines. Without control closely. (In particular, the program Installed in the machine)
5. to be extra careful to exchange news or information on the Internet. In particular, data from the form of free advertising, inviting place.
6. Try to notice anything unusual that happens to your computer, such as the work is always slower. Size up Hard disk space is greatly reduced or abnormal. Display odd
The hard disk light is not lit or extinguished.
7. Should the anti-virus software (Antivirus) installed on your computer. And update the virus signature database regularly. To prevent viruses such as McAfee, Norton, PC-Cillin, Panda, NOD32, etc.

Antivirus is able to use it from the manufacturer's web site. Or download a reliable source such as Download.com, Tucows.com, Thaiware.com etc. Most shareware program is a 30-day trial.