Re: Using Snort to find creditcard data?

> Would it be possible to write a Snort rule that triggers on possible
> creditcard numbers and how would it look like? PCI standars says that
> all creditcard data should be encrypted, It woild be nice to verify
> that no card data shows up where it shouldn't...

Cornell Spider is a data-at-rest scanning program that looks for SSNs
and CCNs.  It's open source, though, and has regexes for both that you
can steal, along with a Luhn validator for CC stuff (I'm not sure if
this is implemented in a regex or something more complex that would be
hard to port to a snort rule).

Be prepared for false positives, though, potentially a large number if
you have significant bandwidth.  They'll show up in random binary data
pretty often.

Thanks,
Mike

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