Re: letdown, dos attempt not detecting

[Y M <snort () outlook com>]

Because this is a custom rule, it has to he manually added to the sid-msg.map file, for example:

1000024 || DOS syn attempt || url, <add the tool for reference>

Also add the the URL to your Snort rule (and revision number too :) ). If the alert is showing in BASE as Snort Alert 
[1:1000024:1], which stands for gid:sid:rev , then you will have to update the "signature" table in the database, 
barnyard2 documents the update statement to execute.

Thanks for the rule.

YM
________________________________
From: Leonardo Pezente<mailto:lmpezente () gmail com>
Sent: ‎12/‎11/‎2012 8:41 PM
To: Russ Combs<mailto:rcombs () sourcefire com>
Cc: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: Re: [Snort-users] letdown, dos attempt not detecting

its really works, thanks. here is the rule:

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"DOS syn attempt";
flags:S; flow:to_server; classtype:attempted-dos; detection_filter: track
by_src, count 1000, seconds 40; sid:1000024;)

the only think is: i cant see the msg on BASE GUI, and this is a really
interesting thing.
2012/12/11 Russ Combs <rcombs () sourcefire com>

> On Tue, Dec 11, 2012 at 11:45 AM, Leonardo Pezente <lmpezente () gmail com>wrote:
>
> > im testing snort attacking it with a tool called "letdown".it is a tcp
> > floder. The think is: im not able to detect what could be a potencial dos
> > attack.
> > Letdown generate like 65000 syn packets, so this should be detect fot
> > snort. I have uncomment the dos and ddos rules, but no deal. so im tring to
> > create a rule to detct this kind of traffic. Is that possible? any idea how
> > i can do that?
>
> Check out Snort's README.filters.  There are rate_filter examples for
> 135:1 that you can start with.
>
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