What is Non-Resident Virus
A non-resident virus is a computer virus that does not store or execute itself from computer memory. Executable viruses are an example of a non-resident virus.
Nonresident viruses can be thought of as consisting of a finder module and a replication module. The finder module is responsible for finding new files to infect. For each new executable file the finder module encounters, it calls the replication module to infect that file.
While talking about Non-Resident Virus, we mentioned Executable file
what is an Executable file?
An executable file (exe file) is a computer file that contains an encoded sequence of instructions that the system can execute directly when the user clicks the file icon. Unlike a data file, an executable file cannot be read because it’s compiled. Executable files commonly have an EXE file extension, but there are other executable file formats.
Some executable files can run on any compatible system without requiring the existence of another program.
On an IBM compatible computer, common executable files are.BAT, COM, EXE, CMD, INF, IPA, OSX, PIF, RUN, WSH and.BIN. On an Apple Mac computer running macOS, the.DMG and.APP files are executable files. Depending on the operating system and its setup, there can also be other executable files.
These files are considered to pose a high-security risk
What is Executable virus
An executable virus is a non-resident computer virus that stores itself in an executable file and infects other files each time the file is run. The majority of all computer viruses are spread when a file is executed or opened.
Executable viruses are particularly dangerous because they can disable antivirus programs, cause annoying and incessant pop-ups that can slow down computer performance, and even steal sensitive information and relay this data to an unauthorized person.