FSS launches on-site inspection of OK Savings Bank after second hack

South Korea’s Financial Supervisory Service (FSS) has launched an on-site inspection of OK Savings Bank after the lender reported a second hacking incident, and says the inspection could be converted into a formal examination depending on how it unfolds, Chosun Biz reports.

The regulator moved immediately after the bank reported the second breach on 16 October. Forensics found the damage was worse than first thought: loan-application victims rose from 183 to 250, and a further 268 victims were identified in the mobile savings service, taking the total to 518 customers, according to Chosun Biz. Leaked data included names, account numbers, product names, balances, interest rates and last transaction dates.

The attacks unfolded over two days. Abnormal access attempts began at 20:44 on 11 October and went unnoticed for about 13 hours and 16 minutes, before further anomalous access to the mobile savings pages was found between 03:32 and 07:34 on 15 October, Chosun Biz said.

OK Savings Bank said it had blocked the suspicious IP addresses and access routes, patched the account-inquiry service’s defence logic and applied an anomaly-detection and blocking solution, adding that no further abnormal access had occurred. The case adds to a widening string of breaches across South Korean financial firms that has drawn the regulator’s attention, as reported by News1 on 18 October.