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Re: [Snort-users] Snort Rule to capture outbound email traffic

from [Frank Knobbe] Network Security [Permanent Link]
Subject: Re: [Snort-users] Snort Rule to capture outbound email traffic
Date: Tue, 21 Jun 2005 14:34:47 -0500 
On Tue, 2005-06-21 at 14:59 -0400, Pennell, Ronald B. wrote:


                alert tcp $SMTP_SERVERS any -> any 25
                                   
                                   
    ( sid: 1000004; rev: 6; msg: "outgoing SMTP"; flow: to_server;
       content: "MAIL FROM"; nocase; classtype: misc-activity;)
                                   
                                   
In the acid viewer I see the classtype but it doesnʼt contain any of
the outbound msgs.



Where am I going wrong?


You are using the flow statement wrong. Check for existing sessions that
go to the server. Use: " flow:established,to_server; "

Regards,
Frank

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