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Re: [Emerging-Sigs] New Proposed Classification.config file setup
From: "Gregory W. MacPherson" <greg () netpublishing com>
Date: Mon, 27 Dec 2010 10:28:08 -0800

Yes, this suggestion makes sense. When I used to be employed by a large
multinational telecommunications company that does their SEIM
development in Belgium, the team that worked on the SEIM was
overwhelmed primarily by the lack of forethought in defining
classifications in such a manner as this. Parsing and logging solutions
for new devices were all handled as custom one-offs because no working
standard was available. 

Because everyone already has their implementations, what breakdown works 
best - not for adoption, but for ease of conversion? This suggestion - 
an atomic breakdown - makes more sense programatically - join() costs 
fewer cycles than split(index()). While metadata is nice, I prefer to
make my decisions with logic in my code. KISS - my .02

G

On or about 2010.12.27 10:41:03 +0000, Martin Holste (mcholste () gmail com) said:

On Mon, Dec 27, 2010 at 9:48 AM, Martin Roesch <roesch () sourcefire com> wrote:
Yeah, I guess I didn't say it but I was recommending new keywords so
that we wouldn't break backwards compatibility. ?I do favor mapping of
assigned enumeration values to strings though, I don't just want
random metadata because that can lead to a Tower of Babel situation
where people start baking up nonstandard things that break external
event processors.


Yes, as a logging/SIEM guy (I'm active on the Syslog-NG list as well),
I am very much in favor of using integers wherever possible.  There's
certainly no reason long-term not to implement a sid-msg.map-like
lookup for tag intval-to-string.  That, of course, also mandates some
standardization for the tags being used, which obviously a good thing.

Doing the metadata tag thing is fine in the near term as a "let's do
something now" solution for people who need it sooner rather than
later but I don't think adding new keywords should be all that tough
in this particular case. ?Does info in the metadata fields even make
it into unified 2 output? ?I'm not in a place where I can look it up
at the moment and I don't remember...

Marty

I'm really pushing for tagging because there will be such an immediate
benefit to getting something simple going.  Being able to just
reliably grep something like "zeus" and "check-in" from the alerts
will make such an impact for communicating to NOC staff which events
are important enough to alert the SIRT in the middle of the night.  I
value my sleep, gentlemen!

The tag values won't need to be included in unified2 output in the
same way that sig names are not included.  It's up to the app to do
the lookup to resolve ints to strings.
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-- 
Gregory W. MacPherson
Global Network Exploitation Specialist, CISSP, Security+, ITIL
http://www.netpublishing.com/greg/

Government is like fire - a handy servant, but a dangerous master.
                                                     - George Washington

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