| A computer virus is a self-replicating
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| | Traditional computer viruses emerged in
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| computer program written to alter the way
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| | the 1980s, driven by the spread of
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| a computer operates, without the
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| | personal computers and the resultant
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| permission or knowledge of the user.
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| | increase in BBS and modem use, and
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| Elk Cloner is credited with being the
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| | software sharing. Bulletin board driven
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| first computer virus to appear "in the
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| | software sharing contributed directly to
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| wild" -- outside the single computer or
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| | the spread of Trojan horse programs, and
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| lab where it was created. Written in 1982
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| | viruses were written to infect popularly
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| by Rich Skrenta, it attached itself to
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| | traded software. Shareware and bootleg
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| the Apple DOS 3.3 operating system and
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| | software were equally common vectors for
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| spread by floppy disk. The first PC virus
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| | viruses on BBS's.
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| was a boot sector virus called (c)Brain,
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| | Since the mid-1990s, macro viruses have
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| created in 1986 by two brothers, Basit
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| | become common. Most of these viruses are
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| and Amjad Farooq Alvi, Pakistan. The
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| | written in the scripting languages for
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| brothers reportedly created the virus to
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| | Microsoft programs such as Word and
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| deter pirated copies of software they had
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| | Excel. These viruses spread in Microsoft
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| written.
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| | Office by infecting documents and
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| Before computer networks became
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| | spreadsheets. Since Word and Excel were
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| widespread, most viruses spread on
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| | also available for Mac OS, most of these
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| removable media, particularly floppy
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| | viruses were able to spread on Macintosh
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| disks. In the early days of the personal
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| | computers as well.
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| computer, many users regularly exchanged
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| | A computer virus may also be transmitted
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| information and programs on floppies.
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| | through instant messaging. A virus may
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| Some viruses spread by infecting programs
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| | send a web address link as an instant
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| stored on these disks, while others
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| | message to all the contacts on an
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| installed themselves into the disk boot
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| | infected machine. If the recipient,
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| sector.
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| | thinking the link is from a friend (a
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| Search Engine Marketing Specialist
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| | trusted source) and follows the link to
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| Since 1995 SEO/SEM tools, training, and
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| | the website, the virus hosted at the site
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| professional "full service" Search Engine
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| | may be able to infect this new computer
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| Marketing help at very affordable rates.
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| | and continue propagating.
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