From gbhackers.com
Credit card sniffers or online skimmers are a type of harmful software that cybercriminals often create using the JavaScript programming language.
Threat actors primarily use this to steal payment card data and PII from unsuspecting individuals while they transact on hacked e-commerce or merchant sites.
Recently, the cybersecurity analyst at Cybel discovered the R3NIN sniffer which has been described as an evolving threat to E-commerce consumers.