Security Experts:

Cybercriminals Stealing Payment Card Data Using Card Redirection

Researchers Discover Credit Card Phishing With a New Twist

Computer security researchers have stumbled upon a nifty trick being using by identity thieves to hijack credit card data during transactions on e-commerce sites.

According to Daniel Cid, Chief Technology Officer at Sucuri, phishers are breaking into e-commerce web sites and surreptitiously planting code to redirect sensitive payment details to third-party domains.

"The attackers modify the flow of the payment process so that instead of just processing the card, they redirect all payment details to a domain they own so they can steal the card details," Cid explained in a blog post.

The trick involves very stealthy, minimal changes to the hacked site. This is done to ensure persistence and to stay undetected for as long as possible.

In one example, Cid showed how a credit card processing file on a hacked e-commerce site was modified to either transmit the credit card data via e-mail or redirect the data flow to a new domain.

The third-party domain receiving the stolen data looks almost like the payment handling site (slightly misspelled to avoid detection).

"This redirection forces all the transaction data, including credit card details (name, address, CC and CVV), through their malicious server, in turn allowing the data to be stolen by the bad guys," Cid explained.

Interestingly, the data redirection does not affect the actual credit card transaction. Instead, the phishers are basically siphoning all the confidential data during the transaction process, quietly stealing credit card data without triggering alarm bells.

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Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. Ryan is a veteran cybersecurity strategist who has built security engagement programs at major global brands, including Intel Corp., Bishop Fox and Kaspersky GReAT. He is a co-founder of Threatpost and the global SAS conference series. Ryan's past career as a security journalist included bylines at major technology publications including Ziff Davis eWEEK, CBS Interactive's ZDNet, PCMag and PC World. Ryan is a director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world. Follow Ryan on Twitter @ryanaraine.