Re: Snort Rule Creation

[John G <drterdnugget () gmail com>]

Forgot to attach the screenshot.

On Tue, Jan 31, 2017 at 5:09 PM, Joel Esler (jesler) <jesler () cisco com>
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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