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encrypt the executable, it starts up with example Virus.exe PID 888 then it finds a process example.exe PID 4567 and merges itself into that process and then terminates its original process PID 888. A virus can stop your anti-virus service then terminate your anti-virus application. And if they were really smart they could run it in kernel mode 0 then task manager would not be able to terminate it. Although Vista and Windows 7 are a bit different.

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Q: Name three ways that a virus can hide from antivirus software?
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