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RE: analysing captured packets
From: "Dean De Beer" <ddb () plazacollege edu>
Date: Thu, 6 Apr 2006 14:41:32 -0400

Hi Robin,

You had mentioned using Ethereal. You might want to have a look at their
Filter Reference page. It gives really detailed breakdowns on each filter.
http://www.ethereal.com/docs/dfref/

For example:
http://www.ethereal.com/docs/dfref/e/eapol.html - 802.1x Authentication
traffic.

HTH,

Dean

-----Original Message-----
From: Robin Wood [mailto:dninja () gmail com] 
Sent: Tuesday, April 04, 2006 11:05 AM
To: Dan Goldberg
Cc: pagvac; pen-test () securityfocus com
Subject: Re: analysing captured packets


Thanks all.

I'm going to have a look through these as they should give me a good base.
The reason I want to learn about this is I'm getting into wireless
pen-testing and so will need to analyse the data I capture during tests. So
I'm not actually looking for analysys of attacks, more higher level captured
data, things like re-building emails, watching windows domain logins that
kind of thing.

Obviously, the same high level data flows over wireless as over wired so
techniques for either would help.

I should have been more specific when I posted my original question.

On 4/4/06, Dan Goldberg <dan () madjic net> wrote:
This is a good place to start learning about "what to look for": 
http://www.packet-level.com/productsServ.htm#labkit
(I am not affiliated - nor have I been to the training)

Of course the SANS Institutes Intrusion Detection course is a great 
place to develop hands on experience with analysis and the mastering 
packet analysis course form SANS to. (I am loosely affiliated with the 
SANS institute but do not gain personally from these activities)

Dan

pagvac wrote:
I know that what I'm gonna say may sound silly, but what I recommend 
you is simply to play with analyzing traffic A LOT. Just watch the 
packets, filter them by protocol, IP address, or whatever you're 
interested in (Ethereal is great for filters). Try to follow 
different protocol "conversations" and try to understand what the 
requests and responses mean.

Good luck on your sniffing experience my friend :-)

Robin Wood wrote:

Hi Can anyone give any pointers to good tutorials on how to go 
about analysing network traffic captured during a pen-test.

I'm currently using ethereal but I'm not necessarily looking for an  
ethereal tutorial more a howto on what to look for in capture 
files. Things like good protocols to spot (e.g. ftp logs in in 
plaintext so you can grab login details), how to recognise what is 
going on by watching the high level handshakes (e.g. a http get is 
usually followed by a response containing html), things like that.

Thanks

Robin

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--
Dan Goldberg
MADJiC Consulting, Inc.
Information Security Services
http://www.madjic.net
--
dan () madjic net
GPG Fingerprint: FC61 396F 8952 EC76 8CCB DAF1 4DD9 5B4C 07E0 B0BA 
Public Key: http://www.madjic.net/dbg.asc
--
Incident Handler - Internet Storm Center http://isc.sans.org/


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