EC-Council
EC0-350 · Question #829
EC0-350 Question #829: Real Exam Question with Answer & Explanation
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Question
More sophisticated IDSs look for common shellcode signatures. But even these systems can be bypassed, by using polymorphic shellcode. This is a technique common among virus writers - it basically hides the true nature of the shellcode in different disguises. How does a polymorphic shellcode work?
Options
- AThey encrypt the shellcode by XORing values over the shellcode, using loader code to decrypt the
- BThey convert the shellcode into Unicode, using loader to convert back to machine code then executing them
- CThey reverse the working instructions into opposite order by masking the IDS signatures
- DThey compress shellcode into normal instructions, uncompress the shellcode using loader code and then
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