full-disclosure - Re: Snort Signature to detect credit cards

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Message-ID: <48240D97.9040404@p6drad-teel.net>
Date: Fri, 09 May 2008 11:38:47 +0300
From: Siim Põder <siim@...rad-teel.net>
To: "Randal T. Rioux" <randy@...cyonlabs.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Snort Signature to detect credit cards

Randal T. Rioux wrote:
> FYI - http://www.emergingthreats.net
> 
> This was discussed on the snort-sigs mailing list back in 2003. Check out
> http://marc.info/?l=snort-sigs&m=106601612825950&w=2
> 
> Also, as Ray mentioned, the Emerging Threats emerging-policy.rules
> contains some PCRE CC# checks. This will show you some:

I wrote a dynamic plugin for detecting CC numbers (requires snort 2.6+):

http://p6drad-teel.net/~windo/release/creditcard.tar.gz

It checks prefixes (visa/amex/etc), number length and the luhn code (the
last digit) + allows arbitrary grouping by dashes and/or spaces.

Siim

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