Question

Let's say the code on the left contains instructions in a virus, and the code on the right side contains a metamorphic version of the virus code. What is the effect of the metamorphic code?

Original code	Metamorphic code
mov eax, 5	mov eax, 5
add eax, ebx	push ecx
call [eax]	pop ecx
	add eax, ebx
	swap eax, ebx
	swap ebx, eax
	call [eax]
	nop

aThe virus author retrieves additional information from the host computer.

bThe virus author creates a backdoor into the host computer.

cThe virus author gains administrative access to the host computer.

dThe virus author changes the signature of the virus without changing the effective meaning of the code.

Answer 1

Solution: Option D is the correct option as if you try to understand the metamorphic version over the right then it is nothing but an enhanced version of the code on the left and produces the same effect. This is how, the virus author changes the signature of the virus without actually changing the effective meaning of the virus code by writing the code on the right.

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