Snort mailing list archives
Using DNS response fields in an alert msg
From: David Longenecker <david () 7longeneckers com>
Date: Wed, 7 Jan 2015 07:19:10 -0600
Hi snort folks, I'm looking for a bit of education. Forgive me if this is not the right forum for questions like this. Over the holiday break, I spent some time with snort and opendns, inspecting DNS responses to detect potential malicious activity on the local network. The idea was, opendns does a good job of *blocking* malicious content by responding with a warning landing page instead of the actual address; I can use that to *alert* when a blocked page is requested. I look for several known landing pages in the dns answer record, and trigger an alert. It works pretty well, with one shortcoming: the alerts identify the offending device, but not the name request. I have to go back to the packet capture afterward to determine the requested domain. Does anyone on this list have an example of snort parsing a dns response into its component name and address fields, and using these fields in the alert message? Project description: http://dnlongen.blogspot.com/snort-dns Just the rules: https://github.com/dnlongen/snort-dns
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Current thread:
- Using DNS response fields in an alert msg David Longenecker (Jan 07)
- Re: Using DNS response fields in an alert msg lists () packetmail net (Jan 07)
- Re: Using DNS response fields in an alert msg lists () packetmail net (Jan 07)
- Re: Using DNS response fields in an alert msg Rodgers, Anthony (DTMB) (Jan 07)
- Re: Using DNS response fields in an alert msg lists () packetmail net (Jan 07)
- Re: Using DNS response fields in an alert msg Joel Esler (jesler) (Jan 07)
- Re: Using DNS response fields in an alert msg Joel Esler (jesler) (Jan 07)
- Re: Using DNS response fields in an alert msg James Lay (Jan 07)
- Re: Using DNS response fields in an alert msg Mustafa Qasim (Jan 07)
- Re: Using DNS response fields in an alert msg Jason Haar (Jan 21)
- <Possible follow-ups>
- Re: Using DNS response fields in an alert msg David Longenecker (Jan 22)
(Thread continues...)
- Re: Using DNS response fields in an alert msg lists () packetmail net (Jan 07)