After infecting a system, some viruses take steps to cleanse the system of any (other) malware. That is, they remove any malware that has previously infected the system, apply security patches, update signature files, etc.
a. Why would it be in a virus writer’s interest to protect a system from other malware?
b. Discuss some possible defenses against malware that includes such anti-malware provisions.
Obtain the Windows executable contained in linear.zi p (available at the textbook website).
a. Use a linearization attack to determine the correct eight-digit serial number.
b. How many guesses did you need to find the serial number?
c. What is the expected number of guesses that would have been required if the code was not vulnerable to a linearization attack?
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