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Computer
Virus
All About PC Viruses.
Web Tech Support
Remember the
only good virus is a dead virus.
Part 2
Computer
Virus - all about: Web Tech Support.
By: WebTechGeek.com
Part 2
What
is a PC Virus? A computer Virus, self-replicating
computer program that interferes with a computer's hardware
or operating system (the basic software that runs your
computer). Most Viruses are designed to replicate and
to elude detection. Like any other computer program, a
virus must be executed to function that is, it must be
loaded from the computer's memory, and the virus's instructions
must then be followed by the computer. These instructions
are called the payload of the virus. The payload may disrupt
or change data files, display a message, or cause the
operating system to malfunction.
Some viruses have the ability to attach
themselves to other programs. The virus attachment may
occur when the legitimate program is created, opened,
or modified. When that program is run, so is the virus.
Viruses can also hide on a portions of your hard disk
or floppy disk that load and run the operating system
when the computer is started, and such viruses thereby
are run automatically.
There are about six categories of viruses:
parasitic, bootstrap sector, multi-partite, companion,
link, and data file. Parasitic viruses infect executable
files or programs in the computer. They leave the contents
of the host program unchanged but append to the host in
such a way that the virus code is run first. These viruses
can be either direct-action or resident. A direct-action
virus selects one or more programs to infect each time
it is executed. A resident virus hides in the computer's
memory and infects a particular program when that program
is executed.
Bootstrap-sector viruses reside on the first portion of
the hard disk or floppy disk, known as the boot sector,
and replace either the programs that store information
about the disk's contents or the programs that start the
computer. Typically, these viruses spread by means of
the physical exchange of floppy disks. Multi-partite viruses
combine the abilities of the parasitic and the bootstrap-sector
viruses, infecting either files or boot sectors.
Part 2 - What is a PC Virus, more about virus.
Part 3 - Protecting yourself from viruses, software list.
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Part 4 - What is a Trojan horse.
Part 5 - Virus hoax.
Trojan horse virus: Part 1
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