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IP and port Info using Netstat (DOC)

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(Cadtrick@hotmail.com) - Date:June,01,2000
----------------
Contact Info:
----------------
Written by: TriÇker(with some slight modifications by R a v e N)
Email:Cadtrick@hotmail.com
ICQ:40884568
AIM:zTrickerz
Web:http://tricksoft.net
----------------
________________________________________________
Title: IP and port Info using Netstat
------------------------------------------------
Table of Contents:
------------------------------------------------
INTRO
I.Use of Netstat
II.Detecting Open ports
III.SYN and ACK
IV.Using Netstat it for ICQ and AIM
V.Other Uses
VI.Tools and Utilities
VII.Two Quick Tips
Conclusion
------------------------------------------------
------------------------------------------------
------------------------------------------------
Intro
------------------------------------------------
Hello thanks for reading this text on learning more about using netstat
to help you. Please disregard any spelling or punction or any other
grammer errors. This text is written so the average reader can
understand
it. Not to complicated. Please enjoy and feel free to email me.
------------------------------------------------
I.Use of Netstat
------------------------------------------------
- (To OPEN Netstat) - To open [Netstat] you must do the following: Click
on the
- [Start] button-->Then click [Programs]--> Then look for [Ms-Dos
Prompt].
Netstat is a very helpful tool that has many uses. I personally use
Netstat
to get IP addresses from other users I'm talking with on ICQ or AIM.
Also
you can use Netstat go moniter your port activity for attackers sending
syn
requests (part of the TCP/IP 3 way handshake) or just to see what ports
are
listening/Established. Look at the example below for the average layout
of
a responce to typing Netstat at the C:\windows\ prompt.
~~~~~~~~~~~~~~~~~~~~
C:\WINDOWS>netstat

Active Connections

  Proto Local Address           Foreign Address        State
  TCP    pavilion:25872         WARLOCK:1045           ESTABLISHED
  TCP    pavilion:25872         sy-as-09-112.free.net.au:3925
ESTABLISHED
  TCP    pavilion:31580         WARLOCK:1046           ESTABLISHED
  TCP    pavilion:2980          205.188.2.9:5190       ESTABLISHED
  TCP    pavilion:3039          24.66.10.101.on.wave.home.com:1031
ESTABLISHED
~~~~~~~~~~~~~~~~~~~
Now look above at the example. You will see [Proto] on the top left. This
just
tells you if the protocal is TCP/UDP etc. Next to the right you will see
[Local Address] this just tells you the local IP/Hostname:Port open.
Then to the
right once again you will see [Foreign Address] this will give you the
persons
IP/Hostname and port in the format of IP:Port with ":" in between the
port and IP.
And at last you will see [State] Which simply states the STATE of the
connection.
This can be Established if it is connected or waiting connect if its
listening.
Now with this knowledge we will dive into deeper on how to use this for
monitering
and port activity and detecting open ports in use.
------------------------------------------------
II.Detecting Open ports
------------------------------------------------
Now so you are noticeing something funny is going on with your computer?
Your cd-rom
tray is going crazy...Opening and closing when your doing nothing. And
you say What the
phruck is going on..or you realize someones been messing with a trojan on
your computer.
So now your goal is to locate what trojan it is so you can remove it
right? Well your right.
So you goto your ms-dos prompt. Now there are many ways to use Netstat
and below is a help
menu. Look through it.
~~~~~~~~~~~~~~~~~~~~
C:\WINDOWS>netstat ?

Displays protocol statistics and current TCP/IP network connections.

NETSTAT [-a] [-e] [-n] [-s] [-p proto] [-r] [interval]

  -a            Displays all connections and listening ports.
  -e            Displays Ethernet statistics. This may be combined with
the -s
                option.
  -n            Displays addresses and port numbers in numerical form.
  -p proto      Shows connections for the protocol specified by proto;
proto
                may be TCP or UDP. If used with the -s option to display
                per-protocol statistics, proto may be TCP, UDP, or IP.
  -r            Displays the routing table.
  -s            Displays per-protocol statistics. By default, statistics
are
                shown for TCP, UDP and IP; the -p option may be used to
specify
                 a subset of the default.
  interval       Redisplays selected statistics, pausing interval seconds
                 between each display. Press CTRL+C to stop redisplaying
                 statistics. If omitted, netstat will print the current
                 configuration information once.
~~~~~~~~~~~~~~~~~~~~~
I personally like using (C:\Windows\Netstat -an) Which Displays all
connections and
listening ports in the form of IP instead of Hostname. As you see how i
did the command
Netstat(space)-a(Displays all connections and listening ports.)n(in
numerical form)
Netstat -an -So doing that does TWO of the options at once no need for -
a-n. So
now that you know how to use netstat to view all your connections and
listening you
can search for common ports like 12345(old Netbus Trojan),1243(subseven)
etc. This
Becomes very handy for everything you will soon find out. Take a break
now and go chill
out on your couch and relax for about 5 minutes and let all this soak in
then come back
ready to learn more. :)
------------------------------------------------
III.SYN and ACK
------------------------------------------------
When you here Syn and Ack(ACKnowledge) you do not think of the
communication of packets on
your system. Well let me tell you what SYN and ACK do.
      [SYN] - SYN in common words is a request for a connection used in
the 3-way handshake
in TCP/IP. Once you send a SYN out for a connection, the target computer
will reply with a SYN and ACK. So basically when you see in [State]
catagory Syn that means you are sending
out a request to connect to something.
      [ACK] - Now the ACK is a ACKnowledgement to the request made by a
computer that is
trying to connect to you. Once a Syn is sent to you you need to ACK it,
then Send back another syn to the computer requesting connection to
confirm the packet sent was correct.
I sure hope that helped you understand a little more about SYN and ACK.
If you have further
questions try looking for texts on TCP/IP (such as BSRF's TCP/IP text -
blacksun.box.sk/tcpip.txt). Now onto the fun stuff.
------------------------------------------------
IV.Using Netstat it for ICQ and AIM
------------------------------------------------
Have you ever wanted to get someones IP address or hostname using [Aol
Instant Messanger]
or [ICQ]? Well your in Luck.
      [AIM] - With AIM you can not ussually find the exact IP address
without some trial and error because most of the time it seems to open up
all online users on Port
5190. So Less users online easier it is. So goto Ms-Dos Prompt and type
netstat -n here you will see under [Foreign Addresses] a IP:With port
5190. Now one of those IP's connected
to you with 5190 is going to be your target aim user. Just use trial and
error to find out
is ussually the easiest way.
      [ICQ] - To get a IP using netstat of a ICQ user is easy before
talking to the person on ICQ you must open ms-dos prompt and do netstat -
n to list all IP's and ports.Write them
down or copy them somewhere you will remember to look back. Now it's time
to find out his
IP. Message the user witha single message now quickly do Nestat -n. And
you will have a new added line of a IP address, just search for the new
one on the list under foreign and once you find it you now have your
buddys ip without any patches or hacks. Pure skill :P.
------------------------------------------------
V.Other Uses
------------------------------------------------
Netstat can be used to get IPs of anything and anyone, as long as there's
a direct connection between you and the target (i.e. direct messages,
file transfers or ICQ chats in ICQ, DCC (Direct Client Connection) chat
and file transfers in IRC etc' etc').
------------------------------------------------
VI.Tools and Utilities:
------------------------------------------------
Port scanning: To look for any open ports on a computer:
 - [7th Sphere Port scanner] - (2 mirror sites so if one link doesnt
work)
      - http://members.xoom.com/Cryptog/7spereportscan.exe
      - http://members.xoom.com/gohan_3/7spereportscan.exe
Firewall to moniter Ports and registry:
 - [Lockdown 2000]
      - http://www.lockdown.com
For Communicating better:
 - [ICQ]
      - http://www.icq.com
 - [Aol Instant Messanger]
      - http://www.aol.com
------------------------------------------------
VII.Two Quick Tips
------------------------------------------------
a.Sometimes Netstat can generate very long lists, which are especially
confusing for newbies. If you're having difficulties, just run netstat,
and then make a direct connection of some sort to your target, or make it
connect to you (ICQ, IRC etc', you get the picture) and run netstat
again. There should be a new line - this is what you're looking for.
b.If netstat's output is too long, type 'netstat -an > c:\some-
directory\some-file.txt' (without the quotes, and you can replace the
parameters -an and the filename and it's path with anything you'd like).
This will dump the output to that file for easy viewing, and will also
let you copy & paste.
------------------------------------------------
Conclusion
------------------------------------------------
I think there are better ways to understand the internet than with tools
you find.
Learn how to do stuff manually so you fully understand whats going on.
This will fuel your
power and kill your lameness :)

-Tricker

				
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