Re: Snort Rule Creation

[Wei Chea Ang <weichea () gmail com>]

Check snort variable. I think you should use that instead.

On Feb 1, 2017 6:36 AM, "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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_______________________________________________
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http://www.snort.org

Please visit http://blog.snort.org for the latest news about Snort!

Visit the Snort.org to subscribe to the official Snort ruleset, make sure to stay up to date to catch the most <a 
href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!