Re: Snort Rules for LOKI Daemon

[twig les <twigles () yahoo com>]

Didn't classic loki use something stupid in the packet
that gave it away?  I believe it was the same sequence
number for every packet.  The reason I bring this up
is I am curious as to how you know what triggers an
alert in Cisco IDS.  I thought the signatures were
off-limits...am I wrong?


--- Matt Kettler <mkettler () evi-inc com> wrote:
> Well, a detection using this method would have to be
> a snort preprocessor. 
> A simple snort rule cannot be stateful, thus can't
> compare the number of 
> echo replies with the number of echo requests...
>
> Of course, if there's something significant in the
> data contents of the 
> echo reply packets themselves, then a simple snort
> rule would work great.
>
> At 02:38 PM 1/22/2003 +0000, kevin reynolds wrote:
> > What rules, if any, does snort use to detect the
> lokid?  If there the 
> > default rule set does not include one, does anyone
> have a custom rule?
> > Cisco IDS fires the lokid signature when it sees
> more incoming echo replys 
> > than outbound echo requests.  This rule depends on
> the foreign host 
> > sending more echo replies to the local host than
> the local host has sent 
> > echo requests to it.  With this logic, you could
> assume that you will see 
> > less than half of all possible loki intrusions. 
> Thanks.
> > Kevin
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