Sears Holdings said Friday the payment systems at its Kmart retail chain had been breached as a result of malware, compromising shoppers’ credit and debit card numbers. The US retail chain’s payment systems were infected with a form of malware that went undetected by its anti-virus systems, Sears said. There is no evidence that Kmart shoppers’ personal information, PIN numbers, email addresses or Social Security numbers were stolen, and the malware has since been removed, Sears said.