[Snort-users] Monitor Authentication

Al Lewis (allewi) allewi at ...589...
Tue Jan 24 10:23:38 EST 2017

"A good rule that looks for root login on ftp would be:

    alert tcp any any -> any 21 (flow:to_server,established; \
        content:"root"; pcre:"/user\s+root/i”;)”

Taken from the snort manual here:


Albert Lewis
SOURCEfire, Inc. now part of Cisco
Email: allewi at ...589...<mailto:allewi at ...589...>

From: Chris Sandford <chris.sandford at ...17499...<mailto:chris.sandford at ...17499...>>
Date: Tuesday, January 24, 2017 at 9:48 AM
To: 'snort-users' <snort-users at lists.sourceforge.net<mailto:snort-users at lists.sourceforge.net>>
Subject: [Snort-users] Monitor Authentication


Looking to run Snort to monitor authentication attempts on external facing devices.

Does anyone have an example of a rule looking at a single IP of a device for monitoring login attempts. The rule would alert for failed and successful logins if detected.

In my example the login method would be to monitor SSH login attempts on an external facing device, although this is blocked by default it would be good to monitor for attempted logon requests.


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