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Virus Codes Actions

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Virus Code Actions
Clara Pirie & Eilidh Currie
Viruses
• A virus is a computer
program that can copy
itself and infect a computer
without the permission or
knowledge of the user.
• Viruses can increase their
chances of spreading to
other computers by
infecting files on a network
file system.
Replication
• In order to replicate itself, a
virus must be permitted to
execute code and write to
memory.
• A simple virus will normally
check if a file has been
infected, if it hasn’t it will infect
it then save the changes to the
executable file. After closing
the file, the finder will find new
files for the replicator to infect.
Camouflaging
• Camouflage viruses attempt to
appear as a benign program
and then pounce and infect
your computer.
• A Trojan horse is an example
of a camouflage virus.
• Often email attachments are
camouflage viruses, as people
open them without realising the
danger in them.
Watching
• A virus can lie and wait or
WATCH for a particular action
or date before it is activated.
• The longer the time before
activation the greater the
number of computer systems
that will be potentially infected.
• A virus which watches for a
date is known as a TIME
BOMB, and a virus which
watches for an action is known
as a LOGIC BOMB.
Delivery
• The delivery of a virus is
the method which it uses
in order to enter a
computer system and
cause the infection.
• Viruses are spread in
seconds over computer
networks and in some
cases security flaws in the
operating system.
WARNING!!!
• If you receive a message
from an unknown email
address – DO NOT
OPEN!! DELETE IT
IMMEDIATELY!!!!
• This applies even more to
emails with attachments.
• You have been warned.
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