History

Lata in the 1970s precursor of viruses before the Internet, 4 [found on ARPANET] was. Bob Thomas in 1971 an experimental vine itself, BBN Technologies, written by 5 [program was copied]. Lata on December ARPANET computer infected PDP -10 TENEX operating system used to run. Lata through ARPANET and the remote system where the message arrived "I Bell, I'll catch if you can copy!" Is shown.

A program called "Rother J" appear in the first computer virus "was the wild" - that is, a computer or lab where it was made out. written in 1981 by Richard Skrenta, the Apple DOS 3.3 operating system and spread connected by the same floppy disk. this virus as a joke while still in high school built Skrenta, was injected in a game on a floppy. Elk Cloner virus for use in its 50 years will be activated, computer infection and is a short poem that begins "Elk Cloner: show program with a personality."

The first PC virus in the wild was a boot sector virus called brain, Farooq Alvi Brothers, Lahore, Pakistan, created in 1986 by software that was written probably to prevent theft . However, analysts have claimed that the Ashar virus, a type of brain, based on code within the virus probably before that.

Before computer networks became widespread, most viruses disks, removable media including floppy, but it spread. In the early days of PCs, many users and programs regularly exchanged information on floppies. Some of these infections spread by the virus program stored on disk, while others went into disk boot sector, ensuring that when the user disk drives, the computer starts normally unknown. Time you tried to boot from PC floppies if you had stayed in unit. Fell into disuse until floppies, boot sector virus infection and the most successful strategy for many years was most common in nature.

Traditional computer viruses emerged in the 1980s, the spread of personal computers and BBS, modem use, and the resulting increase in share driven by software. Classifieds for spreading viruses and trojans driven software sharing contributed directly to the infected software was written popular bags. Shareware and equally for viruses on BBS software bootleg vectors were common. "was a recent target applications easier for virus software for retailers in early trade, the illegal copies of fans" pirate scene.

Macro viruses have become common since the 1990s. Most of these viruses and spread like Microsoft Word and Excel programs for Microsoft Office documents and spreadsheets infection in languages written in the script. Since Word and Excel were also available for Mac OS, including the Macintosh computer. Although most of these virus infected email the virus that took advantage of Microsoft Outlook COM interface is not capable of sending.

Some older versions of Microsoft Word yourself extra blank lines with Makroj permitted to copy. If one document with two macro viruses infected one, a combination of two, then copy itself, one two "" and the father of "likely to be identified as a virus" can appear as coupling is .

All links on a virus infected computer as an instant message link can send a Web address. If the recipient, thinking that links a friend (a trusted source) is added, the website, the virus will be held at the venue for playback can infect this new computer.

Virus spread through the cross-site scripting the first time in the 2002 report and was academically demonstrated in 2005. several examples of a cross - site scripting viruses in nature is, operation of websites like MySpace and Yahoo .