Key facts
- Voice phishing fraud cases detected by five major South Korean banks doubled to 8,760 in 2025.
- The number of suspected voice phishing transactions flagged by banks' systems rose 39.9% to 1.11 million in 2025.
- Banks took temporary measures against 157,000 transactions in 2025.
The number of voice phishing transactions confirmed as fraud after being flagged by monitoring systems at major commercial banks in South Korea doubled in 2025 from the previous year, according to data submitted by the Financial Supervisory Service. The five major banks -- KB Kookmin Bank, Shinhan Bank, Hana Bank, Woori Bank and NH Nonghyup Bank -- detected 8,760 such transactions through their fraud detection systems (FDS) in 2025, a significant increase from 4,343 cases in 2024. These systems are designed to monitor transactions and user activity in real time to identify suspicious behavior. Last year, the banks' FDS flagged 1.11 million suspected voice phishing transactions, up 39.9% from 796,000 in 2024, and took temporary measures against 157,000 of them, compared to 125,000 in 2024. Financial institutions in South Korea are enhancing cybersecurity measures following recent cyberattacks that exposed the personal information of approximately 100,000 individuals.