Re: IDS and forensics

From: perrierorat_private
Date: Fri Jan 24 2003 - 08:48:44 PST

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    Seems to me that this is the software that you are looking for.
    
    http://www.nswc.navy.mil/ISSEC/CID/index.html
    its called shadow. does IDS and also logs all the packets. Seems very
    configurable to me.
    
    Robert Perriero
    Montclair State University
    Systems and Security Group
    
    > I'm interested in other's views of network IDS systems
    > when looking at incident response and forensics
    > activities.
    >
    > This comes up from my hands-on dealings w/ IDSs like
    > RealSecure and NetProwler.  These systems provide
    > alerts, but don't keep the actual packets that
    > initiate the alerts.  I've done some research w/
    > NetProwler specifically, and haven't been able to find
    > any explicit definition or descriptions of the alerts.
    >  So I'll see an alert for "MS RPC portmapper small
    > packets", but I have no way of determining what
    > "small" is...and since we do a lot of DCOM on that
    > subnet, I'd really like to see what the actual
    > contents of the packet are...but can't through
    > NetProwler.  I know I could load up snort or tcpdump,
    > and do captures that way, but Symantec recently
    > announced that it's no longer supporting NetProwler,
    > so...
    >
    > About a year ago I was working w/ RealSecure and had
    > the same issues...couldn't see what the packet
    > contents were, nor could I see what the actual details
    > of the filter were.  On top of that, the ability to
    > create user-defined filters is extremely limited.
    >
    > What this leads to is the question of how useful such
    > systems are in the face of network forensics.  If the
    > packet contents themselves aren't saved in some way,
    > but only used to trigger an alert, then how suitable
    > are such systems for forensics?  To take a step back,
    > if the signatures themselves aren't viewable, and only
    > the alert, then how does the admin *really* determine
    > what happened?  In most cases, they'd be at the mercy
    > of whatever info the IDS console provides.
    >
    > Thoughts?
    >
    > Carv
    >
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