easyctf-2017/self-modifier/last.asm
John W 23125c60af Added the morphing problem
Along with all of its generation script stuff...
2017-03-11 20:30:25 -06:00

37 lines
635 B
NASM

format binary
use32
include 'std.inc'
; On entrance to each shellcode segment the ebx register will be a vtable of std funcs
; printf
; puts
; scanf
; sin
; cos
; tan
; asin
; acos
; atan
; malloc
; free
; esi contains the base address of the shellcode segment
; edi contains the address of the part of the flag that this segment fills
; edx contains the number of the block
jmp start
output_text db 'Assuming you got every challenge right here is the flag: %s', ENDL, 0
start:
shl edx, 2
sub edi, edx
push edi
mov eax, dword [ebx]
lea ecx, [esi + output_text]
push ecx
call dword [eax]
add esp, 8
ret
resv_stuff 512-$