There is a continual war between virus writers and anti-virus software writers. As soon as new viruses are created, anti-virus software is created to neutralise and remove them. Virus writers have adopted various strategies to fool anti-virus software. One of the most popular and successful ways of fooling anti-virus software is to create a stealth virus.
Stealth viruses contain code that inserts itself between the operating system and the anti-virus software. Whenever a check is made for a virus, the stealth virus tells the operating system that there is no problem. In this way, the anti-virus software can be ignored and the virus can continue doing its work
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