Magento just relased a new security scan tool which you can read more about here:
https://magento.com/blog/magento-news/secure-your-storefront-enhanced-magento-security-scan-tool
Highly recommend everyone adds their website to this and configures a daily scan, I've worked with many many customers in the past of various sizes and some didn't even know that their checkout page had been hacked and that the first attempt of every purchase the card details got skimmed before the second attempt was redirected to the real payment provider!
Better yet it is FREE for all users and very easy to setup.
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