![]() ![]() A user-agent string might look something like this: One thing we noticed that was a little unusual, is code that queries the legitimate Cloudflare endpoint API and parses out the results specifically for two things: the user's current IP address and browser's user-agent. ![]() While financial institutions can reissue you a new card in the mail, the information the criminals have collected is equivalent to a data breach and can be reused for other types of fraud later on.įigure 3: Skimmer data collection and fingerprinting ![]() ![]() This is something that is often overlooked when talking about digital skimmers but yet is extremely important. The underlying code will scrape everything from the customer's contact and payment forms. The final rendering is identical to official payment platforms and does not give anything away:įigure 2: Fake payment forms injected by skimmer Fingerprinting via Cloudflare API The skimmer uses iframes that are loaded if the current page is the checkout and if the browser's local storage does not include a font item (this is equivalent to using cookies to detect returning visitors).įigure 1: Skimmer checking for address bar and inserting iframe Because the victim already filled in their home address, we believe this is a fingerprinting effort much like what is done in traditional malware campaigns. We recently spotted a Magecart skimmer that collects the current victim's IP address and browser user-agent in addition to their email, address, phone number and credit card data. Using special cards for tracing purposes can also be used by defenders to follow the money. Filling up phishing pages with junk data is a sport of its own, although it may also be counterproductive at times. There are different services that exist to vet such things as credit card numbers so that buyers can purchase with confidence.Ĭriminals are also very aware that anyone and in particular security researchers may want to interfere with their operations. One important aspect of data theft in criminal markets revolves around the authenticity of the data that is being resold. ![]()
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