What is the transmission route of computer virus?

Computer viruses are called viruses because they are contagious. Traditional channels usually have the following types:

(1) Through floppy disks: The most common way of infection is through the use of externally infected floppy disks, such as system disks from different channels, software of unknown origin, game disks, etc. Due to the use of floppy disks with viruses, the machine was infected with viruses and spread to uninfected "clean" floppy disks. A large number of floppy disk exchanges, legal or illegal program copies, and the uncontrolled use of various software on the machine have caused a hotbed of virus infection and spread.

(2) Through the hard disk: Infection through the hard disk is also an important channel. Because the machine with the virus is moved to other places for maintenance, the clean floppy disk will be infected and spread again.

(3) Through CD-ROM: Because CD-ROM has a large capacity and stores a large number of executable files, there may be a large number of viruses hidden in the CD-ROM. For a read-only CD, you can't write, so the virus on the CD can't be removed. In the process of making illegal pirated software for profit, it is impossible to be specifically responsible for virus protection, and there will never be truly reliable and feasible technical support to avoid the introduction, infection, epidemic and spread of viruses. At present, the proliferation of pirated CDs has brought great convenience to the spread of viruses.

(4) Through the Internet: This infection spreads very fast and can spread to machines on the Internet in a short time.

With the popularity of the Internet, it has added a new way to spread the virus. Its development makes the virus a disaster, the virus spreads more rapidly, and the anti-virus task is more arduous. Internet brings two different security threats. One threat comes from file downloading, and these browsed or downloaded files may contain viruses. Another threat comes from email. Most Internet mail systems provide the function of sending messages with formatted documents between networks, so documents or files infected by viruses may flood into enterprise networks through gateways and mail servers. The simplicity and openness of network use make this threat more and more serious.