Incident Score: Analysis & Impact (TOK1767382731)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of TOKYO FM BROADCASTING CO.,LTD.'s Breach and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts TOKYO FM BROADCASTING CO.,LTD. Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the TOKYO FM BROADCASTING CO.,LTD. breach identified under incident ID TOK1767382731.
The analysis begins with a detailed overview of TOKYO FM BROADCASTING CO.,LTD.'s information like the linkedin page: https://www.linkedin.com/company/tokyofm, the number of followers: 69, the industry type: Broadcast Media Production and Distribution and the number of employees: 16 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 760 and after the incident was 661 with a difference of -99 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 TOKYO FM BROADCASTING CO.,LTD. and their customers.
On 01 January 2026, Tokyo FM Broadcasting Co., LTD. disclosed Data Breach issues under the banner "Tokyo FM Broadcasting Co., LTD. Data Breach".
A major cyber incident involving Tokyo FM Broadcasting Co., LTD., where a threat actor using the alias 'victim' claimed to have breached the company's private computer systems and exfiltrated over 3 million records containing personal and technical data.
The disruption is felt across the environment, and exposing Over 3 million records, with nearly Over 3 million records at risk.
Formal response steps have not been shared publicly yet.
The case underscores how Pending verification, and recommending next steps like Listeners and users are advised to monitor their emails for suspicious activity and change passwords if they reused credentials, with advisories going out to stakeholders covering Listeners and users are advised to monitor their emails for suspicious activity and change passwords if they reused credentials.
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.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (70%), with evidence including internal login IDs compromised, and attack during reduced staffing (holiday) and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating breach of private computer systems (implied external access). Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), with evidence including data exfiltration such as true, and over 3 million records exfiltrated and Transfer Data to Cloud Account (T1537) with moderate confidence (60%), supported by evidence indicating threat actor shared screenshot on X (cloud platform). Under the Credential Access tactic, the analysis identified Unsecured Credentials: Cloud Instance Metadata API (T1552.005) with moderate confidence (50%), supported by evidence indicating internal login IDs compromised (implied credential exposure). Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (30%), supported by evidence indicating no evidence of encryption, but high-impact data breach and Data Destruction (T1485) with lower confidence (20%), supported by evidence indicating no evidence of destruction, but large-scale exfiltration. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- TOKYO FM BROADCASTING CO.,LTD. Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/tokyofm/incident/TOK1767382731
- TOKYO FM BROADCASTING CO.,LTD. CyberSecurity Rating page: https://www.rankiteo.com/company/tokyofm
- TOKYO FM BROADCASTING CO.,LTD. Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/tok1767382731-breach-january-2026/
- TOKYO FM BROADCASTING CO.,LTD. CyberSecurity Score History: https://www.rankiteo.com/company/tokyofm/history
- TOKYO FM BROADCASTING CO.,LTD. CyberSecurity Incident Source: https://hackread.com/tokyo-fm-data-breach-hacker-3-million-records-stolen/
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf