OK Savings Bank Reports Additional 268 Customers Affected by Hacking Incident

OK Savings Bank has reported that an additional 268 customers' information was compromised in a hacking incident. This brings the total number of affected customers to 518, including 250 previously confirmed victims from a loan application webpage breach.

According to the financial sector on October 16, OK Savings Bank confirmed the hacking attack on its mobile notification service website while conducting a comprehensive system check until October 15.

The attack occurred from 3:32 a.m. to approximately 7:32 a.m. on October 15. The leaked information includes customer names, account numbers, product names, balances, interest rates, and the dates of the last transactions.

OK Savings Bank noted that the Internet Protocol (IP) address used in this attack was different from those previously flagged by the Financial Security Agency as suspicious. The bank has reported the hacking incident to the Financial Supervisory Service and has individually notified affected customers via text messages and emails.

The bank stated that it has implemented follow-up measures, including blocking the suspicious IP, patching the account inquiry defense logic, and urgently applying solutions for detecting and blocking abnormal activities. Currently, no new unauthorized access attempts have been reported.

Previously, on October 12, OK Savings Bank announced that a hacking incident had compromised the names, birth dates, addresses, annual incomes, and loan amounts of 250 customers.

An official from OK Savings Bank said, "After recognizing the initial data breach on October 12 and completing emergency responses, we discovered additional leaks during a thorough re-examination of the entire system. We sincerely apologize once again for causing concern to our customers who have trusted us."