Magecart hackers found out how to get to Sesame Street's online store - and in all likelihood thousands more merchants - by initially compromising e-commerce and shopping cart service provider Volusion to deliver the credit card-skimming code.

Israel-based security researcher Marcel Afrahim, who for his day job works as a research developer at Check Point Software Technologies, recently discovered the skimming scam after shopping for toys on sesamestreetlivestore.com, the official e-commerce website for the Sesame Street Live! touring show. The store, which has been temporarily taken down, runs on an e-commerce platform from Austin-based software company Volusion. (Related site www.sesamestreetlive.com is apparently unaffected and still up and running.)

Afrahim noticed that during checkout process, a suspicious JavaScript file was loaded from a Google Cloud Storage domain name. The file, resources.jr, pretends to be a JavaScript API for handling cookies. But in reality, it's skimmer code that's designed to post credit card information entered by the user to a domain registered as Volusion-Cdn[.]com. But this domain has nothing to do with the legitimate Volusion; it is an attacker-controlled URL.

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