I like this, thanks for posting it.
I've put this rule up on bleedingsnort.com, but it's disabled by
default. You'll have to enable it the appropriate places for your
network. Oinkmaster is perfect for this.
#alert tcp any any -> any any (msg:"BLEEDING-EDGE SSN Detected in Clear
Text"; pcre:"/\b[0-9]{3}-[0-9]{2}-[0-9]
{4}\b/"; sid:2001328; rev:1;)
Please let us know about any falses or issues there. It looks good so far.
NOTE: This may be a high resource consuming rule. I'd monitor any
heavily loaded sensors for a bit for packet loss if you use this rule.
Matt
Harper, Patrick wrote:
Someone on the snort-users list asked how to detect SS numbers in a
snort rule, I put the one I wrote out there and was quickly reminded how
lacking my PCRE kung foo is. With the input of the reformed rules nazi
and a few others I got some input that helped me re-write the PCRE for
it and I wanted to run it past this list and put it out for anyone that
it might help.
/\b[0-9]{3}-[0-9]{2}-[0-9]{4}\b/
Without the \b I was getting too many false positives, mainly form web
cookies. Let me know what you think, and thanks for the help and any
suggestions.
Patrick S. Harper | CISSP RHCT MCSE
Information Security Engineer
patrick.harper@phns.com
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