A malicious code that changes itself with each file it
infects is called a:
A. logic bomb.
B. stealth virus.
C. trojan horse.
D. polymorphic virus.
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Answer: D
A polymorphic virus has the capability of changing its own
code, enabling it to have many different variants. Since
they have no consistent binary pattern, such viruses are
hard to identify. A logic bomb is code that is hidden in a
program or system which will cause something to happen when
the user performs a certain action or when certain
conditions are met. A logic bomb, which can be downloaded
along with a corrupted shareware or freeware program, may
destroy data, violate system security, or erase the hard
drive. A stealth virus is a virus that hides itself by
intercepting disk access requests. When an antivirus program
tries to read files or boot sectors to find the virus, the
stealth virus feeds the antivirus program a clean image of
the file or boot sector. A trojan horse is a virus program
that appears to be useful and harmless but which has harmful
side effects such as destroying data or breaking the
security of the system on which it is run.
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