Re: Snort Rule Creation

[James Lay <jlay () slave-tothe-box net>]

And doc link:

http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node29.html#SECTION00423000000000000000

James

On 2017-01-31 16:09, Joel Esler (jesler) wrote:
> Maybe something like:
>
> > alert tcp $SOURCEIP any -> ![destip1, destip2, destip3] any
> > (msg:”Unauthorized TCP traffic initiated”; flags:S; sid:1000000;
> > rev:1;)
>
> ?
>
> --
> JOEL ESLER | TALOS: Manager | jesler () cisco com
>
> > On Jan 31, 2017, at 5:33 PM, John G <drterdnugget () gmail com> wrote:
> >
> > Good Afternoon everyone,
> >
> > My name is John and I am starting out with creating Snort rules.  I
> > have experience using Snort with IDS's such as Sourcefire and
> > Security Onion for incident response.  However, i don't have much
> > experience creating custom rules.  Although i once created a rule
> > during one of my security classes during my undergrad program lol
> > Anyway, i have been reading documentation for how to
> > understand/create rules from a variety of sources.  But I wanted to
> > reach out to you guys and see what information you can provide.
> >
> > I have a device that is communicating with about 8 other devices.  I
> > would like to write a rule that alerts if it detects any
> > communication outside of those devices.
> >
> > Is it possible to list multiple ip addresses within a rule and maybe
> > use an is not "!=" attribute.
> >
> > So something like: alert tcp != sourceip1  80 -> destip1, destip2,
> > destip3, etc (msg:"Alert Message";)
> >
> > I would appreciate any assistance and will continue to do my own
> > research and see if i can figure it out on my own :)
> >
> > Regards,
> > John
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> >
> > Visit the Snort.org to subscribe to the official Snort ruleset, make
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> > https://snort.org/downloads/#rule-downloads";>emerging threats</a>!
>
>
>
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> ------
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>
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href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!