Figure 1: This is a simple shell based virus.ITN 106 – Extra CreditPurposeThis extra credit assignment worth an extra 7.5% of your final grade. It isoptional.ProblemsThe script in figure 1 is a small virus we built in class. Note that every virusperforms four main operations.• Run a payload script.• Locate other files to infect.• Check if the located files are already infected.• Infect any uninfected located files.1Notably, this script has an empty payload. Needless to say, you should avoidrunning this on any machine you care about unless you want to be remindedof this class long after this semester.To complete this assignment, you need to accomplish several tasks:• Write a virus detection script.• Create an uninfected script that will trigger your virus detection script:a false positive.• Write a virus removal script.• Explain what will happen if your virus removal script acts on a falsepositive.• Rewrite the virus to include a payload.For the virus detection script, you should use the same mechanism thevirus uses. You can test the detection script on infected and uninfected files.The virus detection script should be used in the following way: detect.shsuspect-file.sh The detection script should echo out a message indicatingwhether the file is valid or not. Hint: To create your solutions, reuse as muchof the original virus as possible.While writing the detection script, you may have realized it makes mistakes. The false positive should cause the detection script to fail, despite notcontaining the virus. For credit, you must create the shortest false positivepossible.The virus removal script is similar to the original virus, but rather thanadding the virus, it removes it. The virus removal script should be used thefollowing way: clean.sh The removal script does not need to display anyoutput. It should clean all files in the same directory as it. Hint: To createyour solutions, reuse as much of the original virus as possible.The payload can be anything, but a simple echo command is fine. Whenyou rewrite the script to have a payload, the payload must always run whenan infected file runs, but must only once. Hint: Make sure adding the payloaddoesn’t run your virus’s ability to infect.To get full credit on this assignment, you must submit the following:• A screenshot or text file containing a working virus detection script.• A screenshot or text file containing a false positive.2• A screenshot or text file containing a working virus removal script.• A succinct explanation of what the virus removal script does to falsepositives.• A screenshot or text file containing a working virus with a payload.3
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