It is a malicious code that installs in the memory and then infects future programs. Also known as the Terminate and Stay Resident (TSR), it finds a way to load in the computer’s RAM and then infects the executable files that are opened by the user when a certain conditions are met. A few examples of this kind of virus are Jerusalem Virus, Onehalf virus, Magistr, Junkie, Satanbug etc.
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