JavaScript – or JS – sniffers – skims credit card information and other data from online shopping sites. The malware costs between $250 and $5,000 to buy on underground forums, security firm Group-IB finds. Researchers identified 38 JavaScript sniffers, eight of which had never been identified previously. Most of these JS-sniffer attacks are associated with an umbrella organization dubbed Magecart, which comprises 12 cybercriminal “families” The majority of the JS sniffers are set up to steal information from different websites and content management systems.”]
Source: https://www.cuinfosecurity.com/e-commerce-javascript-sniffer-attacks-proliferate-report-a-12350