what is Program file virus ?
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A file infector virus attaches itself to executable programs, such as word processors, spreadsheet applications, and computer games. When the virus has infected a program, it propagates to infect other programs on the system, as well as other systems that use a shared infected program. File infector viruses: these infect program files, such as applications, games etc. They are often memory-resident, meaning that once they have been executed they remain active in the computer's memory and can infect more programs. Examples are- Jerusalem and Cascade.
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