Re: How to write a snort rule match NO content GET orPOST in http request

["Lay, James" <james.lay () wincofoods com>]

From: Andrew Torres [mailto:aatorres19 () gmail com] 
Sent: Wednesday, July 25, 2012 10:47 AM
To: Lay, James
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] How to write a snort rule match NO content
GET orPOST in http request

 

I do not think that accomplishes what he is trying though, as that will
simply alert when those strings are not found, not when they are not the
http methods involved. The signature is possible I just can not think of
a really efficient way of doing it using the http options. You can do a
content match for everything but GET and POST and do a fast_pattern of
HTTP/1.1 or something. Might be faster to just write individual sigs for
the methods that you are concerned about. and use the http_method option
in each sig rather than a contnet match. A lot of ways to solve the
problem, I am just not sure which is the best. Will wait for someone
more knowledge than me to chime in. 

On Wed, Jul 25, 2012 at 11:31 AM, Lay, James <james.lay () wincofoods com>
wrote:

-----Original Message-----
From: Tran M. Thang [mailto:tmthang () vncert vn]
Sent: Wednesday, July 25, 2012 12:33 AM
To: snort-users () lists sourceforge net
Subject: [Snort-users] How to write a snort rule match NO content GET
orPOST in http request

Hi Snort Users,

Please help me to write a snort rule that matches http request with NO
content GET or POST.

Thanks!




> From the snort manual, you can use content negation, ie content:!"Get";

Hope that helps.

James

 

 

I'm thinking something like:

 

content:!"GET"; content:!"POST"; http_uri;

 

or

 

content:!"GET"; content:!"POST"; http_method;

 

Perhaps?

 

James

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