[Snort-users] Anomaly-detection dynamic preprocessor

Stephen Reese rsreese at ...11827...
Mon Feb 25 10:54:56 EST 2013

Might want to checkout http://anomalydetection.info/

On Mon, Feb 25, 2013 at 10:33 AM, Андрей Меньков
<nothingelsematters7 at ...11827...> wrote:
> Could plz somebody tell that maybe there is something wrong in my future
> implementation?
> Or may be there already exists such dynamic preprocessors for Snort?
> I think that it cannot be implemented as part of Snort itself because of
> possible high false-positive rate.
> But for some special-purposed networks, in my opinion, - it can be extended
> with such anomaly detection preprocessor.
> On 23 February 2013 00:44, Андрей Меньков <nothingelsematters7 at ...11827...>
> wrote:
>> Hello all.
>> I'm on the latest year of studying in my University and write my dyploma.
>> I choosen NIDS as theme and so now I try to implement dynamic preprocessor
>> for Snort which will be based on this dataset http://www.iscx.ca/dataset.
>> There are files in pcap format + excel files with labels for these packet
>> flows
>> First of all, I need to learn somehow my preprocessor. It will be done by
>> processing and analyzing these pcap files and maybe using labels attached to
>> them (but not necessary).
>> I have some questions. It would be great if someone would help me and
>> maybe give some good ideas :-)
>> 1. I can give these pcap files as input to Snort - so I obtain all the
>> power of snort decoding network data. With this I can write preprocessor for
>> learning, that will obtain traffic from files and move analyzed data
>> somewhere. But there is a problem. It's no smart to detect anomalies using
>> only information about only single packet. It would be convenient to for
>> example reassemble them (e.g. in connection for TCP packets) for better
>> analyzing. And maybe there are another "tricks".
>> So the question is actually smth like "Can I use for example Stream5
>> preprocessor for learn my preprocessor?" It reassemles packets in
>> connections
>> 2. What about existing implementations of such dynamic preprocessors?
>> 3. Maybe It would be better to implement it not as dynamic preprocessor,
>> but dynamic engine?
>> Thanks in advance :-)
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