Quote:Just in time for a busy online holiday shopping season, the Magecart gang has come up with a new credit-card skimming technique for hijacking PayPal transactions during checkout.
A security researcher who identifies himself as Affable Kraut discovered the technique, which uses postMessage to inject convincing PayPal iframes into the checkout process of an online purchase, “the first skimmer to deploy such a method,” he said on Twitter. BleepingComputer first reported his research.
Magecart is an umbrella term encompassing several different threat groups who all use the same attack method: They compromise e-commerce websites to inject card-skimming scripts on checkout pages, stealing unsuspecting customers’ payment card details and other information entered into the fields on the page. The info is then sent back to a server under the attackers’ control.
Affable Kraut used data from Sansec, a security firm aimed at combatting digital skimming, to peer under the hood of the new card-skimming technique. While most methods that try to emulate PayPal pages to trick users into entering details even when the process is being hijacked don’t look very authentic, the one he observed “goes through a lot of work to try and be as convincing as possible,” Kraut tweeted.
One of the key factors lending to this appearance is its use of a script called window.postMessage, which enables cross-origin communication between a Web page and a pop-up that it spawned, or between a page and an iframe embedded within it.
Read more: https://threatpost.com/magecart-hijacks-...ns/161697/
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