Kmart and Dairy Queen customers should check their credit- and debit-card statements for shady activity. That’s because the retailer and the fast-food chain have become the latest businesses to reveal that their payment systems were hacked. “Beginning in early September, the payment data systems at Kmart stores were purposely infected with a new form of malware (similar to a computer virus),” Kmart President and Chief Member Officer Alasdair James said in a statement this week. “This resulted in debit and credit card numbers being compromised.” A statement from Dairy Queen, also this week, said “payment card customer names, numbers and expiration dates” had been accessed by way of malware. Kmart’s James said there was no evidence as yet of any personal information, debit card PIN numbers, email addresses or Social Security numbers being nicked during the hack and that Kmart.com customers didn’t seem to be affected.