Re: Feasibility of one off rule

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

Thanks for the response gents...appreciate it.  Here's a more complete url from my logs:

http://web1.51.la:82/go.asp?svid=5&id=3771531&tpages=1&ttimes=10&tzone=-6&tcolor=24&sSize=1680,1050&referrer=
http://web1.51.la:82/go.asp?svid=20&id=4123038&tpages=1&ttimes=1&tzone=-7&tcolor=32&sSize=1280,1024&referrer=
http://web1.51.la:82/go.asp?svid=5&id=3534164&tpages=1&ttimes=1&tzone=-6&tcolor=32&sSize=1152,864&referrer=

Hope that helps.  Thanks.

James

From: Alex Kirk [mailto:akirk () sourcefire com] 
Sent: Monday, June 13, 2011 10:54 AM
To: Lay, James
Cc: snort-sigs () lists sourceforge net
Subject: Re: [Snort-sigs] Feasibility of one off rule

In principle, probably not a bad idea. In practice, there's a bit of an implementation challenge.

The issue is performance. You'd need something to stick in the fast pattern matcher - thus, a fixed string that 
shouldn't be too common - to make it more than "if I see traffic on these ports, fire", and thus make it not slow. I 
suppose you wouldn't see "GET" very often on off ports, so that might work; I'd just wonder if there's a more 
consistent piece of the HTTP headers that's a bit longer than 3 characters that we could expect to be able to use in a 
rule like this.

I don't suppose you've got more data than just the URL in question, do you?
On Mon, Jun 13, 2011 at 9:25 AM, Lay, James <james.lay () wincofoods com> wrote:
Hey all!

Looking through logs today....have come across:

http://web1.51.la:82/go.asp

Which according to malwaredomains.com is no good.  I was wondering if it
was feasible or a good idea to even create a rule that would fire on one
or two offs from the standard port?  I do see that msn.com uses port 81
for an item:

http://apnxscm.ac3.msn.com:81/CACMSH.ashx?&t=1

These are all blocked anyway, but eh...was curious if this could be a
worthwhile idea.  Thanks.

James

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-- 
Alex Kirk
AEGIS Program Lead
Sourcefire Vulnerability Research Team
+1-410-423-1937
alex.kirk () sourcefire com

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