8/28/2014 How Hackers Use Your IP Address to Hack Your Computer & How to Stop It « Null Byte

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How Hackers Use Your IP Addressto Hack Your Computer & How toStop It

Your IP (Internet Protocol) address is your unique ID on the internet. It's

synonymous with your home address. Anyone in the world can contact your

computer through its IP address, and send a retrieve information with it.

I'm sure at one time or another you've heard that hackers can hack your

computer via your IP address. This is one of the reasons proxies and

anonymity services exist, to protect people from learning your IP address. So

how are hackers using just an address to get into your computer and make

your life hell?

Open ports. Your computer runs services like media sharing on what are

called ports. A port is just an opening that a service uses as a

communications endpoint. There are 65,535 total allocated ports in

TCP/UDP. To exploit a service on a port, a hacker would banner grab for the

software and version. After they learn that information, they would search

sites like Packet Storm for known exploits to run against the service.

Today's Null Byte is going to demonstrate a simple "port scan" on local

computer using Nmap, and teach how a hacker would exploit these services,

as well as how to guard ourselves against it. This will be done under Linux,

but Nmap is available for all platforms. If you can't figure out how to install it

in Windows with the GUI installer (yeah, right), follow along using Cygwin.

Bold words are commands that must be entered in a terminal emulator.

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12

KUDOS

Step 1 Download & Install Nmap

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8/28/2014 How Hackers Use Your IP Address to Hack Your Computer & How to Stop It « Null Byte

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First, we must download Nmap, which is going to be our tool that we use for

port scanning and information gathering:

wget http://nmap.org/dist/nmap-5.51.tar.bz2

Now, extract the archive:

tar -zxvf nmap-5.51.tar.bz2

Change to the newly made directory:

cd <directory name>

This is the standard installation procedure:

./configure

make && sudo make install

Nmap should now be installed!

Let's scan a local computer. I'm going to use a website as an example, rather

than a local computer. This is because my firewall is absolutely crazy, and

filters out scans. Don't scan a remote computer with the intentions of doing

bad deeds. This is for educational purposes only.

Start by mapping out your local network:

sudo nmap -sP 192.168.1.0/24

That should return a list of hosts that are up for a port scan!

Out of the returned list of targets, pick one that you would like to scan for

services. Let's do a full scan of all the TCP/UDP ports:

sudo nmap -p 1-65535 -T4 -A -v <target IP goes here>

You should get something that looks like the following image:

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Step 2 Scan for a Target

Step 3 Scan Your Individual Target

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8/28/2014 How Hackers Use Your IP Address to Hack Your Computer & How to Stop It « Null Byte

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Remember to Give Kudos, Tweet, Like, & Share90

REDOUANEHAMMOU

1

1 year ago Reply

thnks my frnd the infrmat:°

1

1 year ago Reply

do you have free hacker program ?

Subscribe

As you can see, this target has MANY open ports. SSH piques my interest, so

let's move on to banner grabbing to learn the software version or our choice

of service.

For this, you can use the regular ol' telnet client. Telnet comes with Windows

and most Linux distros:

telnet <host IP> <port banner to grab>

From this, I would learn which software version the service is running, then

see if I can find a way to exploit it.

Luck for all of you lovely people, I recently made a tutorial on iptables, which

will filter out unwanted connections. Also, disable any unnecessary programs

that connect to the internet (remote administration, media sharing, etc).

Windows users, install Comodo firewall, it's incredible and uses a simple

point and click installation, and will filter ports for you. It has great default

settings and it is free.

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Step 4 Banner Grabbing

How Can I Protect Myself?

See Also

OFF

If u use the root app. Can u then use urphone as a hot spot? Please let me know.Thanjs

Even though i have not a clue, it was excitingto read your article but after glancing downand reading these comments my brain hurts!

THANK YOU VERY MUCH. YOU SAVED MYPHONE AFTER ROOTING HIM. THANK YOUVERY MUCH. GOOD BLEESS YOU

This anti-rinsing campaign is getting well outof hand and is bordering on the kinds oflunacy usually found only in UCB (universityof california at berkeley) where theprofessors there suggested ...

8/28/2014 How Hackers Use Your IP Address to Hack Your Computer & How to Stop It « Null Byte

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CHEVANZKO RIEGOLEVATORE

OMARKHAMIS

1

6 months ago Reply

you are noob bitch the only noob say do u have hacker program

if u want to be hacker...

1 first get ICDL

2 learn more about c++

3 learn windows commands 7,8,xp

4 and also learn small lunix commands for nobody say to you im a hacker

and tell you lunix commands and u dont it

exploits/pentest

5 if u used c++ you can make a hacker programm for you only or make a

groupe .. use windows command and c++ lunix commands every thing

and upload it to your friends that know about ICDL or computer

commands

LOVEMANIA

1

1 year ago Reply

i know the ip address of that computer i want to hack... lz tell me how can i...

i want to hack my frnd computer. he has given me a permission to hack his

computer.

LIAMFRASER

1

1 year ago Reply

how do u down load it

JOSHUABARNES

1

1 year ago Reply

Is there anyway you could post an after pic of the telnet service after you run

it? PM me with it if you want

MORGANBEJI

1

8 months ago Reply

i do not get any banner after connecting to the host

and can not find where to put the username and password

OCCUPYTHEWEB

1

8 months ago Reply

Morgan:

The banner will only appear if there is a web server running like IIS or

Apache.

OTW

OMERATICI

1

7 months ago Reply

how to hack ip address ?

OCCUPYTHEWEB

1

7 months ago Reply

Omer:

Welcome to our community of hackers here at Null Byte!

Do you have BackTrack installed? If so, Metasploit is included and you can

use it to hack.

OTW

1 hi, i dont if there's any related post about what i'm looking for but what if i

want to access my home computer by another computer in another network.

8/28/2014 How Hackers Use Your IP Address to Hack Your Computer & How to Stop It « Null Byte

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JESSICATHEDOC

4 months ago Reply

Thanks anyway

OCCUPYTHEWEB

1

4 months ago Reply

Jessica:

If you enable RDP on your home computer you can access it remotely.

OTW

ILYASKHAN

1

4 weeks ago Reply

this site software is very wonder full.......

YOU

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