This is a really interesting article that talks about how a piece of malware is stealing credit card information.
https://thehackernews.com/2018/02/pos-malware-dns.html
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This was pretty cool- I dug a little deeper [link below] and it looks like they were getting the credit card data by scraping the memory of other processes. If I were writing this Malware, I’d just use a keylogger, since most Magstripe readers are just treated as keyboards by the machines they’re attached to.
https://blogs.forcepoint.com/security-labs/udpos-exfiltrating-credit-card-data-dns