A polymorphic virus creates an infection in a computer that is known as a polymorphic infection.
A polymorphic virus is one that creates copies of itself, with
variations in each copy to fool a virus detection program and user. The
variations are typically different encryption methods in the virus file
copies, which makes it more difficult for a virus detection program to
detect and remove a polymorphic virus from a computer.
Polymorphic
infections are difficult for virus detection programs to cleanse
because one polymorphic virus could have hundreds or thousands of
variants. Developers that design the detection programs have to write
extra lines of code in order to make the programs better at detecting
the virus infections. Even the best antivirus programs have trouble with
detecting and cleansing polymorphic infections, although antivirus
programs with heuristic do have a better time at detecting these types
of viruses.
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