Cracking Credit Card Hashes with PowerShell

As penetration testers, we are frequently engaged to do penetration tests for PCI compliance. As a part of these penetration tests, we look for cardholder data (Card Numbers, CVV, etc.) in files, network traffic, databases, and anywhere else we might be able to catch it. Often times, we will find hashes of credit card numbers along with the first six and/or last four numbers of the credit card number. Given that credit card numbers are a fixed length, this limits the keyspace that we need to use to brute force the hashes.

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