[Snort-sigs] Snort Rule Creation

James Lay jlay at ...3266...
Tue Jan 31 18:35:16 EST 2017


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 at ...3865...
> 
>> On Jan 31, 2017, at 5:33 PM, John G <drterdnugget at ...2420...> 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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> 
> 
> 
> Links:
> ------
> [1] http://SlashDot.org
> 
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> Visit the Snort.org to subscribe to the official Snort ruleset, make
> sure to stay up to date to catch the most <a href="
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