Save & SharePolymorphic viruses
Polymorphic viruses are complex file infectors that change physical forms, yet retain the same basic routines, after every infection. Such viruses typically encrypt their codes during each infection, altering their physical file makeup by varying encyrption keys every time.
This capability to change their physical makeup can allow polymorphic viruses to evade antivirus scanners, and can require antivirus products to use complex patterns and newer scan engines.
