What are Malicious Code?

Sometimes, we have heard about trouble of virus, computer virus are not like bacteria in the real life. It’s different. Virus is codes that are made by program language (example. C++, Java, VB). This program code is malicious code. Malicious code are always called all kind of program, macro or script that can be opened and made with purpose to broke computer system. Bug which are expressly by programmer, not enter to this category. But bug which are disturb very much, it’s enter to malicious code. Malcode(malicious code) is indeed made because of want to broke the operation system. By learning a method of an operation system, programmer can make a virus. Virus for operation system linux can’t be used in Microsoft operation system. According to Symantec, who are made Norton antivirus, as far as now, there are approximately 60000 virus, worm or the other malcodes.

Varian of virus is very fast to spread in the world. This malcodes can be classified in third group. They are virus, worm, and Trojan horse.

1. Virus

Virus have wicked ability to replicate themselves and these are code horde which can modify target code are running. Or these can modify internal target code, so that before target code run, it is forced to run virus. Viruses always show unlike massage, broke display, delete CMOS memory, broke information system in the hard disk. Example of virus: Tati my love, brain, one half, welchia, die hard, etc.

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2. worm

worm just replicate themselves in the computer memory like hard disk, floppy disk or flash disk, difference virus and worm is “are they infected target or not”. Viruses are infected target code, while worms are not. Worm just stays in the computer memory. Worms can be quickly to replicate themselves and they are usually used on LAN or Internet, network which are infected will be used up, and it will be slow-moving to transfer data. Example of worm: SoBig, Code Red, Sircam, Brontok, I-worm/Explorerzip, etc. worm usually have extensions like .com, .exe, or .scr.

3. Trojan Horse

Trojan horses are made with a wicked purpose. Different with virus or worm, Trojan horse can not replicate themselves. Generally, they are brought by the other utility program. Example of Trojan horse: Win-Trojan/back orifice, Win-Trojan/Subseven, Trojan Horse Backdoor. Delf.AQQ. Trojan Horse Generic7.FJN.