We want to make ASM (Attack Surface Management) a more effective initiative.

Yokohama Bank, Ltd. is a designated financial institution used by Kanagawa Prefecture and many of the prefecture's cities, towns, and villages, and strongly supports the local economy. In 2023, the bank will make Kanagawa Bank a consolidated subsidiary, and is currently working on a medium-term management plan with the aim of becoming "a solutions company that is rooted in the community and chosen to walk alongside the community."

Bank of Yokohama had previously introduced threat intelligence, but attempts to collect information from the dark web and analyze the activities of threat actors were difficult to use and were not put to much use. "On the other hand, as each business division has begun to manage IT assets, such as providing new cloud services and apps, the importance of ASM (Attack Surface Management) for understanding the attack surface of IT assets that may be subject to cyber attacks that the company has not fully grasped, and discovering vulnerabilities, has increased," explains Daigo Sato, head of the Security Management Office, which is responsible for responding to security incidents and considering preventive measures for the entire group.

The ASM included in the intelligence we had introduced at the time required us to register assets ourselves, and we were unable to identify and manage assets that were not yet identified. In addition, although there were indications of asset vulnerabilities, the information was inaccurate and not comprehensive. "Because we couldn't do this, the problem of not being able to link it to improvement activities became apparent," recalls Ryodai Fushimi, head of the department.

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