Genetic memcpy

What does it do?

• Generate X86 Assembly code for memcpy

How?

• Using genetic algorithm

  • k-tournament selection
  • 2 points crossover
  • Bit and Byte mutations

• Using Unicorn CPU emulator

Output examples

By default the input address is in ESI, the output address in EDI and its length in ECX.

Here are some outputs of this script

Format : ADDRESS CODE

30000 repne movsd dword ptr es:[edi], dword ptr [esi]
30002 jb 0x2fff7
30004 lds edi, ptr [eax]
30006 loope 0x2ffe7
...

30000 push edi
30001 movsb byte ptr es:[edi], byte ptr [esi]
30002 inc eax
30003 pop esp
30004 inc eax
30005 jmp 0x30001
...

...
3003a arpl di, dx
3003c movsd dword ptr es:[edi], dword ptr [esi]
3003d push esi
3003e jno 0x3003a
...

Not that beautiful, but it does a memcpy.

Requirements

• Python >= 3
• Unicorn >= 1.0.0

Tested on both windows 10 and Ubuntu 16.04

Inspired by https://github.com/gynvael, who produces great content on Youtube !