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Viruses can be classified into different categories according to how they behave. What's a sparse infector?
They evade detection by infecting systems at a different speed than most other viruses
They infect empty areas in files
They evade detection by minimizing the number of files or systems they infect
They use different protocols in order to evade detection
By limiting the number of files or systems they infect, sparse infectors can often evade detection. See--> https://www.techopedia.com/definition/4025/multipartite-virus
In order to spread widely, a virus must attempt to avoid detection. To minimize the probability of its being discovered a virus could use any number of different techniques. It might, for example, only infect every 20th time a file is executed; it might only infect files whose lengths are within narrowly defined ranges or whose names begin with letters in a certain range of the alphabet. There are many other possibilities.
A virus which uses such techniques is termed a sparse infector.
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