[Bro] Slow-motion DoS attack

Liam Randall Liam.Randall at gigaco.com
Mon Jan 9 03:07:45 PST 2012


I would be interested in the script as well.  We will be running a BRO
box out at Shmoocon this year and I'm _sure_ we'll see some interesting

Liam Randall

-----Original Message-----
From: bro-bounces at bro-ids.org [mailto:bro-bounces at bro-ids.org] On Behalf
Of Seth Hall
Sent: Saturday, January 07, 2012 11:59 PM
To: Will
Cc: bro at bro-ids.org
Subject: Re: [Bro] Slow-motion DoS attack

On Jan 7, 2012, at 5:00 PM, Will wrote:

> I was wondering if anyone has set anything up in Bro to monitor their
web servers for this style of attack.

I have a script. :)

I've been working on this for a little while already, but I'm still
expanding it to work against some of the newer attacks like the one that
takes advantage of TCP window sizes to execute a slow read attack.  The
script still kind of sucks and has false positives in a few cases (and
I'm sure false negatives as well), but I'm slowly working on getting
those ironed out.

If you'd like a copy of my script to try, let me know and I can get it
over to you.


Seth Hall
International Computer Science Institute
(Bro) because everyone has a network

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