Essay heading: Advanced Shellcoding Techniques

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Technology

 

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July 25, 1997

 

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5 / 1249

 

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How can we use these attributes to our advantage when writing shellcode? Well, let's think for a second, the instruction takes only one operand, therefore, since it is a very common instruction, it will generate only two bytes in our final shellcode. It multiplies whatever is passed to it by the value stored in %eax, and stores the value in both %edx and %eax, completely overwriting the contents of both registers, regardless of whether it is necessary to do so, in order to store the result of the multiplication...
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Let's put on our mathematician hats for a second, and consider this, what is the only possible result of a multiplication by 0? The answer, as you may have guessed, is 0. I think it's about time for some example code, so here it is: xorl %ecx,%ecx mul %ecx What is this shellcode doing? Well, it 0's out the %ecx register using the xor instruction, so we now know that %ecx is 0...
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