Friday, September 2, 2016

Intel Assembly Basics: Opcode & Shell Code

Intel Assembly Basics
return 0;

Could be represented by this

xor eax, eax

Which have lower level cpu OpCodes of these values

leave # 0xC9
xor eax, eax # 0x31, 0xc0
ret # 0xC9

Which means if you wanted to create a shellcode of the 'return 0' statement in C you'd do the following.

unsigned char shellcode[] = "\xc9\x31\xc0\xc9";

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