[Bro] Bro behavioral analysis

[James Lay]

On Wed, 2015-07-29 at 14:08 +0200, Savakh S wrote:

> Can someone explain why Bro is said "behavioral" IDS  and give an
> example ? I understand Bro can perform protocol analysis, DPI, by its
> analyzers, but what about "behavioral" ?
> 
> Thanks in advance.
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Consider the below:

https://github.com/bro/bro-scripts/blob/master/smtp-url.bro

##! A script for handling URLs in SMTP traffic. This script does 
##! two things. It logs URLs discovered in SMTP traffic. It 
##! also records them in a bloomfilter and looks for them to be
##! visited through HTTP requests. 
##!
##! Authors: Aashish Sharma <asharma at lbl.gov>
##! Seth Hall <seth at icir.org>

That may fit the bill as "behavioral".

James
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