Splunk Search

Check to valid credit card number - mod10|Luhn algorithm

rafamss
Contributor

Hello everyone,

I'm using the SPL to get credit card numbers on search time (I would like to maintain this on search time) :

 

 

| rex field=_raw "(?<firstStep_CC>(?:\d[ -]*?){13,30})"
| eval secondStep_CC=replace(firstStep_CC, "\-|\s|\.", "")
| rex field=secondStep_CC "(?<creditcard>^4[0-9]{12}(?:[0-9]{3})?)|(^5[1-5][0-9]{14})|(^6(?:011|5[0-9][0-9])[0-9]{12})|(^3[47][0-9]{13})|(^3(?:0[0-5]|[68][0-9])[0-9]{11})|((?:2131|1800|35\d{3})\d{11})"

 

 

With this SPL I get possible credit card numbers, but invalid numbers as well. Do you need a way to get only valid numbers?

I thought to split each digit from creditcard and do a mod10 verification, but I don't know if it's efficient. I read a lot of posts like these:

https://community.splunk.com/t5/All-Apps-and-Add-ons/TA-luhn-How-to-use-the-luhn-command-and-how-to-...

https://wiki.splunk.com/Community:Credit_card_masking_regex

Tks!

Labels (4)
0 Karma
1 Solution

richgalloway
SplunkTrust
SplunkTrust

What constitutes a valid CC number?  If you need to verify the check digits then you'll probably need a custom command.

---
If this reply helps you, an upvote would be appreciated.

View solution in original post

0 Karma

richgalloway
SplunkTrust
SplunkTrust

What constitutes a valid CC number?  If you need to verify the check digits then you'll probably need a custom command.

---
If this reply helps you, an upvote would be appreciated.
0 Karma

rafamss
Contributor

I need to validate if the credit card number is valid on search time, but for what I've found, is necessary to use the Luhn algorithm (modulus10) to do this. So I think, that it won't be possible to do just using SPL.

0 Karma
Get Updates on the Splunk Community!

Improve Your Security Posture

Watch NowImprove Your Security PostureCustomers are at the center of everything we do at Splunk and security ...

Maximize the Value from Microsoft Defender with Splunk

 Watch NowJoin Splunk and Sens Consulting for this Security Edition Tech TalkWho should attend:  Security ...

This Week's Community Digest - Splunk Community Happenings [6.27.22]

Get the latest news and updates from the Splunk Community here! News From Splunk Answers ✍️ Splunk Answers is ...