[Snort-sigs] Re: [Snort-users] Who doesn't care about virus rules, and why?

Snortty cwcwcwg at ...144...
Fri Nov 7 05:55:08 EST 2003

Yes, William, 

Would you mind posting your rules to illustrate the
point please?

One objective for our snort IDS to be installed on our
network backborne is to be faster in respond to the
worm incidents like those ones occurred recently and
it would help great deal if your way really works. 

Thanks in advance. 

--- Iain Hallam <ccidsh at ...2009...> wrote:
> Williams Jon wrote:
> > What we've ended up doing is monitoring the
> default route path for
> > our network and watching for either TCP SYNs that
> are going places
> > they shouldn't or TCP RST packets generated either
> by the firewall or
> > the odd host that is actually hit.  With
> thresholding, we can
> > generate fairly useful alerts in cases where, in
> Blaster's case, one
> > source address sends out TCP port 135 SYN packets
> to more than X
> > number of hosts in Y period of time.  This is so
> reliable, in nearly
> > every case we've used it on, that we are able to
> auto-generate email
> > alerts that go to someone else to actually _deal_
> with the problem
> > rather than making the IDS staff track down and
> call each victim
> > independantly.
> We're doing something similar with ICMP on our
> network, but how can you 
> tell the difference between large numbers of hosts
> and large numbers of 
> packets to a single host? Would you mind posting one
> of your rules to 
> illustrate the point?
> Thanks,
> Iain.
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