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Network Security Snort-Signatures
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Re: [Snort-sigs] correction and new rule about keyloggers

from [Chich Thierry] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] correction and new rule about keyloggers
Date: Wed, 26 Apr 2006 17:42:52 +0200 
Le Mercredi 26 Avril 2006 17:06, Nigel Houghton a écrit :

On  0, Chich Thierry <thierry.chich@ac-clermont.fr> wrote:

The first rule I have sent was a little buggy. A "|" was lacking. Thanks
to rmkml.

alert tcp $HOME_NET any -> any 25 (msg:"LOCAL TEST - elitekeylogger v1.0
report"; flow:established;content:"MAIL FROM|3a|<logs@logs.com>";
tag:session,60,seconds;classtype:policy-violation;sid:1200604131;rev:1;)


Is there a space between the ":" and the <logs... in that Mail From
line?


No. There is space in the body of the mail (this what we are seeing in the 
source of the email): 
From: <logs@...

But this is generated by the mail server. The keylogger just writes: 
MAIL FROM:<logs@.. 
in the second step of the SMTP protocol.






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