[Snort-sigs] Snort Rule Creation

Desmond Agee dezmondagee at ...144...
Tue Jan 31 20:41:13 EST 2017


What program is that a snap-shot of?

Desmond Agee

> On Jan 31, 2017, at 8:27 PM, John G <drterdnugget at ...2420...> wrote:
> 
> Alright, so this is basically what I did.  
> 
> Alert ip !SOURCEIP any [8, Destination, IP's] any (msg:”Unauthorized TCP traffic initiated”;)
> 
> I figured out that you can negate with ! in front of the IP's.  To test it, I have been sending ping packets to the destination IP's from a source ip address that is NOT what i entered in the Source IP part of the rule.  However, I am not receiving any alerts.  Do i need to add arguments to look for tcp traffic? 
> 
>> On Tue, Jan 31, 2017 at 5:58 PM, John G <drterdnugget at ...2420...> wrote:
>> Forgot to attach the screenshot.  
>> 
>>> On Tue, Jan 31, 2017 at 5:09 PM, Joel Esler (jesler) <jesler at ...3865...> 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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>>> 
>> 
> 
> ------------------------------------------------------------------------------
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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=" https://snort.org/downloads/#rule-downloads">emerging threats</a>!
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