Incident Score: Analysis & Impact (KYU1781281967)

In this Rankiteo incident briefing, we review the Kyuden International Corporation breach identified under incident ID KYU1781281967.

The analysis begins with a detailed overview of Kyuden International Corporation's information like the linkedin page: https://www.linkedin.com/company/kyuden-international-corporation, the number of followers: 9475, the industry type: Utilities and the number of employees: 51 employees

After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 753 and after the incident was 643 with a difference of -110 which is could be a good indicator of the severity and impact of the incident.

In the next step of the video, we will analyze in more details the incident and the impact it had on Kyuden International Corporation and their customers.

On 08 June 2026, Kyushu Electric Power Transmission and Distribution Co. disclosed Data Breach issues under the banner "Kyushu Electric Power Data Breach Exposes 10.9 Million Customer Records in Japan’s Largest-Ever Breach".

Kyushu Electric Power Transmission and Distribution Co.

The disruption is felt across the environment, affecting Backup storage system, and exposing 10.9 million customer records, with nearly 10.9 million records at risk.

In response, moved swiftly to contain the threat with measures like Investigation ongoing, drive remains unrecovered, and stakeholders are being briefed through Notifications to regulators (PIPC, METI) and pending customer notifications.

The case underscores how Ongoing (drive unrecovered, no evidence of data leakage), teams are taking away lessons such as Physical security of data storage media is as critical as cybersecurity defenses. Unencrypted backup media and unlocked storage cabinets pose severe risks, even in biometrically secured environments. Subcontractors and business partners are significant sources of security incidents in Japan, and recommending next steps like Enforce encryption for all portable backup media as per NIST SP 800-209, Implement stricter physical access controls and auditing for storage areas and Enhance third-party risk management for contractors and subcontractors, with advisories going out to stakeholders covering Regulatory notifications submitted to PIPC and METI. Customer notifications pending.

Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.

The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.