[Snort-users] simple rule to alert when visiting a website

Joel Esler jesler at ...1935...
Tue Nov 17 11:44:27 EST 2009


Actually ip lists aren't terribly as speedy as a simple content match.

J

On Tuesday, November 17, 2009, Rob Dixon <rob.l.dixon at ...11827...> wrote:
> Hi Mary,
>
> There are some setup guides and other documentation @snort.org that cover this subject.
>
> There are a few ways to do this.
>
> You could simply use a content match to look for "ebay.com", but this would also trigger for any site that has that text.(false positives)
>
> You could set a variable in the snort.conf and call it $ebay_servers and put ebays net block in there? Then write a simple rules to match the headers only. (more efficient)
>
> Alert tcp any any -> ebay_servers any (msg:"Warning - EBAY Activity";) something like that?
>
> Or, use squid in passive mode.
>
> Sounds like fun, good luck!
>
> Rob
>
> On Tue, Nov 17, 2009 at 10:49 AM, mary andrews <maryandrews22 at ...11827... <javascript:_e({}, 'cvml', 'maryandrews22 at ...11827...');>> wrote:
> Forgive us, but we are evaluating the software and we are now learning it too,
> OK, I suppose you can call us newbies.
>
>
> we are trying to write simple rules, we have had some success so far,
> a little at a time, we are now trying to write a small rule to alert if someone
> is visiting a specific site, say www.ebay.com <http://www.ebay.com/>
>
> so far we have this in a file called testing.rules.
>
> # testing.rules
> alert icmp any any -> any any (msg:"$$$$$TESTING rule$$$$$"; sid:1000001;)
>
>
> its rudimentary, we know, but its working ok. before we uncomment the config and include
> a bigger set of rules, we want to regresstion test them in their simplest form.
>
> if someone replies, and since I am not 100% sure how this list works yet,
> could you please copy me here? maryandrews22 at ...11827... <javascript:_e({}, 'cvml', 'maryandrews22 at ...11827...');>
>
> many thanks,
> m
>
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Joel Esler | 302-223-5974 | gtalk: jesler at ...1935...




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