Snort: Re: Could you send me on a signature to capture all emails that are sent to a domain, for exa mple “ () tnt com”

[Ned Moran <ned () mysterymachine info>]

send an email to yourself in a lab environment. record the pcaps. write
and test a rule based on those pcaps. youll learn more doing this yourself.

-ned

On 1/26/13 4:16 PM, Aisling Brennan wrote:
> Hi there,
>
> This worked fine. 
>
> Can you help with syntax for a rule to detect email attachnents ? 
>
> Tks 
>
> Sent from my iPhone
>
> On 19 Jan 2013, at 18:37, Balasubramaniam Natarajan <bala150985 () gmail com> wrote:
>
> > On Sat, Jan 19, 2013 at 1:30 AM, Aisling Brennan <aislingbrennan21 () gmail com> wrote:
> >
> > Two points
> >
> > 1. Please don't convey the entire message using the Subject :-O
> >
> > 2.  Try this signature
> >
> > alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg:"Mail sent to at tnt dot com domain"; flow:to_server,established; 
> > content:"rcpt to|3a|"; nocase; content:"|40|tnt|2e|com"; within:800; sid:10000000; rev:1;)
> >
> > -- 
> > Regards,
> > Balasubramaniam Natarajan
> > www.blog.etutorshop.com
>
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