Re: Intrusion Detection

[Daniel Cid <danielcid () yahoo com br>]

Hi David,

There are many things you can do to "try" to detect
intrusions on your systems. I say "try", because if
the attacker succeeded, he can do a lot of tricks
to hide himself. In my opinion, the three most
important things you need to do at a host level are:

-Watch your logs and send them as close to real time
as possible to an external system for analysis. I
think that most admins do not care about their logs
and they miss a lot of useful information. Having the
logs on
an external system make them harder to be deleted or
altered. *and yes, I mean httpd logs, mail logs,
syslogs, ids logs, etc.

-Monitor your system and kernel for anomalies. If you
see similar system calls having different results or
strange files or anything else "weird", you may need
to check for rootkits.

-Monitor your binaries and configuration files for 
changes and store the baseline outside of each system.

Besides host-based detection, you may need to watch
your network traffic for weird ports (I like to bottom
20 concept -- the least accessed ports) and run an
NIDS to detect any know-attacks.


*Ok, now some propaganda. I think ossec is the only
system that does all the three aspects I mentioned
about host-based intrusion detection. It analyses
your logs in *real time (very closed to it at least),
it does rootkit detection and file integrity checking.
All these information is stored on an outside box and
the communication between the server and the "agents"
(which you install on every box you want to monitor)
is done with compression and encryption.

you can check it out here:
http://www.ossec.net

latest version:
http://www.ossec.net/files/ossec-hids-0.8-6.tar.gz

Paper I wrote about the log analysis and
intrusion detection. Maybe helpful too:
http://www.ossec.net/en/loganalysis.html

Thanks,

--
Daniel B. Cid
dcid ( at ) ossec.net


--- David Robert <david31900 () rogers com> escreveu:

> Hello all,
>
> I've been reading this list for some time and I
> can't help but notice that
> there is a lot of information and discussion about
> securing systems, but
> very little about how to detect if you *are*
> compromised.
>
> This one of my major concerns.  I can advocate all
> kinds of practices and
> procedures, but eventually someone will get through.
>  So how can I tell?
> Especially if they are trying not to leave traces?
>
> Is there a few very simple, dumb things that
> everyone should do in this
> regard?  If so, then I haven't heard them.  If you
> could list them, or point
> me to some good resources, it would be much
> appreciated.
>
> Thanks,
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