A payment card breach suffered by [24]7.ai. between September 26 and October 12, 2017, is impacting major firm, including Best Buy, Delta Air Lines and Sears Holdings. Best Buy confirmed it will notify affected customers and offer free credit monitoring to them. Delta Airline speculates attackers infected systems with a malware that was able to siphon payment card data entered on websites that use the chat software. Sears Holdings said the breach has impacted the credit card information of less than 100,000 customers.”]
Source: https://securityaffairs.co/wordpress/71109/data-breach/247-ai-security-breach.html