Re: Snort Rule Creation

[Desmond Agee <dezmondagee () yahoo com>]

What program is that a snap-shot of?

Desmond Agee

> On Jan 31, 2017, at 8:27 PM, John G <drterdnugget () gmail com> 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 () gmail com> wrote:
> > 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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>
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> href=" https://snort.org/downloads/#rule-downloads";>emerging threats</a>!
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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>!