[Snort-users] thank you-> Does Signature exist alert on DNS queries to a nameserver.

Jacob, Raymond A Jr raymond.jacob at ...7622...
Tue Mar 7 13:15:07 EST 2006


thank you,
Raymond 


Message: 4
From: Zultan <zultan at ...13388...>
To: "Jacob, Raymond A Jr" <raymond.jacob at ...7622...>,
	snort-users at lists.sourceforge.net
Date: Mon, 06 Mar 2006 20:59:14 +0000
Subject: Re: [Snort-users] Does Signature exist alert on DNS queries to a
 nameserver.


Here's the basic syntax.  Note the hex number between the pipes. It is the =
count of the number of following ASCII bytes.  For example, freebeertoday.c=
om would be |0d|freebeertoday|03|com

alert udp $HOME_NET any -> $DNS_SERVERS 53 (msg:"amazon.com DNS query"; con=
tent:"|06|amazon|03|com"; nocase;)

Sensor placement is critical for this to work.  The senosr must be able to =
see the desktop ask its nameserver(s).


Zultan






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