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Viruses can be classified into different categories according to how they behave. What's an armored virus?
They infect empty areas in files
They evade detection by spoofing legitimate programs and files from the perspective of an operating system
They conduct actions, such as altering time stamps in files, to make them more difficult to detect
They use encryption to evade detection
An armored virus is a computer virus that contains a variety of mechanisms specifically coded to make its detection and decryption very difficult.
One of these methods involves fooling anti-virus software into believing that the virus is resides somewhere other than its real location, which makes it difficult to detect and remove. Another kind of armor is implemented by adding complicated and confusing code, which has no other purpose other than to mask the virus and prevent virus researchers from creating an effective countermeasure.
Armored viruses are very complex and have significant code involved, which adds to their armor. Although quite effective, the flip-side is that all the armor creates a very large virus that can be detected more easily before it has a chance to infect anything. EDIT: How does the explanation relate to the selected answer? Other answers seem to fit better.
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