Nowadays, computer system's security is becoming more and more significant in people's daily life. So, more and more attentions have been payed to computer viruses which will do great harm to the computer system. Understanding of the computer viruses well will help us greatly. The paper analysised all kinds of technologies in different viruses which existing in Windows system, and proposed the correlative scheme of detecting viruses.
The paper summarized the mechanisms of infection, propagation and how to control the host computer which existing in script virus, macro virus and mail virus. The paper also included the common methods to prevent script virus, macro virus, mail virus, and proposed a new scheme to prevent virus based on command codes.
Worm viruses have become the main form in current network environment. Characteristic of worm viruses have been summarized and gave the protective step in the paper. Computer viruses become wiser and wiser. The virus anti-detecting technology has been collected, such as hiding, anti-tracing, and polymorphism.The paper also presents concept, harm, principle, cleaning, prevention of trojan horse.
Today, network was the main source catching computer viruses; the paper give common computer's viruses detection technic and concept of firewall.
Keywords: Script virus, Worm virus, Trojan horse, Virus detection, Firewall