As reported first by ZDNet, researchers found the dump on October 28. Group-IB says some cards are being sold at $100, with a total value of the database estimated at over $130 million. According to researchers, this is the single biggest and one of the most valuable database uploads on the dark web. Right now, details of the source or origin of these card details are not known. Ilya Sachkov, CEO and founder of Group-IB, said data uploads from this region are quite rare, and it has notified authorities of this incident: It’s not clear at the moment which banks are compromised. However, Group-IB said more than 18 percent of cards were related to a single Indian bank. We’ve asked the cybersecurity company for more details, and we’ll update the story if we hear back.