An information leak incident occurred at a business partner, making it urgent to accurately and continuously understand the security posture

The Iyo Bank, headquartered in Matsuyama City, Ehime Prefecture, has contributed to the sustainable development of the local economy and industry for over 140 years. Currently, in order to respond to the diversifying and sophisticated needs of customers coupled with digitalization, the bank is working on reforms on various fronts to further deepen and evolve its "Digital-Human-Digita (l DHD) model," which leverages the advantages of both people and digital technology.

In August 2024, the bank was hit by a shocking incident. A subcontractor was the victim of unauthorized access via ransomware, resulting in the leak of personal information. Fortunately, no secondary damage such as misuse of information was confirmed, but as a financial institution that supports the foundation of the local economy, the bank cannot tolerate an incident that inconveniences customers and damages its own reputation. Therefore, to prevent such an incident from recurring, the bank decided to strengthen its security measures. Tsukasa Yoshii, Section Manager of the Systems Department, said, "As part of our countermeasures, we decided to strengthen checks not only on the bank and group companies, but also on external subcontractors, and we felt it was urgent to accurately and continuously monitor their security posture."

In this regard, the Ministry of Economy, Trade and Industry has also pointed out the importance of external evaluation of security measures, such as by issuing the "ASM (Attack Surface Management) Implementation Guidance" in 2023. The ministry has also announced a policy to launchthe "Security Measures Evaluation System for Strengthening Supply Chains" in fiscal 2026, a system that will visualize the status of security measures in each company's supply chain.

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