RE: DOS attacks

["Gary Freeman" <Gary.Freeman () rci rogers com>]

Hi Paul (we're family :-)

I would do one of two things (that we've done successfully for Ted's
homepage in the past):

1) Place a snort probe on the same vlan that your web servers are
running on and run the signatures geared toward Stream4 HTTP decode and
Web attacks.  Load SnortSnarf locally to generate reports right to an
apache website that can be cron'd every hour if you like.

2) Build a Honeypot and place it into your web DMZ as a sacrificial
lamb.  Attackers will think it's the real thing and can even go as far
as to get root, install root-kit and try to run an IRC or mirror off
that box.

If you don't have any IDS/IDP on your server DMZ or user segments then
Cable should look into purchasing it.  I've been running SNORT probes in
all the DMZs, web access and VPN blocks for two years now and since our
last worm outbreak the CIOs have taken an interest in replacing them
with a supported solution.

Give me a call if you'd like (name's on the GAL)...

Gary Freeman
Network Security Specialist
RSS-IT Security Planning
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-----Original Message-----
From: Paul Ryan (Wave) 
Sent: Friday, August 06, 2004 12:27 PM
To: security-basics () securityfocus com
Subject: DOS attacks
Importance: High

Are there any forensic type tools to assist me in the following
situation.

 

I have a small group of my Internet customers attacking an external web
server. Rather than just cut them off - I've spoken to the server admin
and
received his syslogs.. what I would like to do is to get to the root
cause -
whether it be purposely or a worm/Trojan..
Thus far - I've retina/nessus scanned, profiled the traffic to the
server
(to get a packet/ bandwidth total) .is there anything else you can
recommend
?

Any comments will be greatly appreciated .

 Regards,

 

paul




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Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off
any course! All of our class sizes are guaranteed to be 10 students or less
to facilitate one-on-one interaction with one of our expert instructors.
Attend a course taught by an expert instructor with years of in-the-field
pen testing experience in our state of the art hacking lab. Master the skills
of an Ethical Hacker to better assess the security of your organization.
Visit us at:
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