Incident Score: Analysis & Impact (NIN1781814318)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Nintendo'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 Nintendo 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 Nintendo breach identified under incident ID NIN1781814318.
The analysis begins with a detailed overview of Nintendo's information like the linkedin page: https://www.linkedin.com/company/nintendo, the number of followers: 860804, the industry type: Computer Games and the number of employees: 7543 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 765 and after the incident was 723 with a difference of -42 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 Nintendo and their customers.
Nintendo of America recently reported "Nintendo Data Breach via Third-Party TinyPulse Service", a noteworthy cybersecurity incident.
Nintendo of America confirmed a data breach involving TinyPulse, a third-party employee survey platform, after the extortion group Shadowbyt3$ claimed to have stolen sensitive internal data.
The disruption is felt across the environment, affecting TinyPulse (third-party platform), and exposing Internal survey content, employee names, email addresses, bank statements, W-9 forms, internal reports.
In response, and stakeholders are being briefed through Public acknowledgment of the breach.
The case underscores how Ongoing, with advisories going out to stakeholders covering No impact on customer accounts.
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 Supply Chain Compromise: Compromise Software Supply Chain (T1195.002) with high confidence (90%), supported by evidence indicating breach involving TinyPulse, a third-party employee survey platform. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate to high confidence (70%), supported by evidence indicating third-party platform (TinyPulse) compromise likely involved access tokens and Account Discovery (T1087) with moderate confidence (60%), supported by evidence indicating employee names, email addresses, and internal reports exposed. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating 1GB of data allegedly stolen, including bank statements, W-9 forms and Data from Information Repositories (T1213) with moderate to high confidence (80%), supported by evidence indicating internal survey content and reports spanning 2016 to 2026 accessed. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating shadowbyt3$ claimed to have stolen 1GB of data and Exfiltration Over Web Service (T1567) with moderate to high confidence (70%), supported by evidence indicating threatened to leak data if ransom not paid. Under the Impact tactic, the analysis identified Data Encrypted for Impact (Extortion) (T1471) with high confidence (90%), supported by evidence indicating $2 million ransom demanded; data leak threatened if unpaid. Under the Defense Evasion tactic, the analysis identified Valid Accounts: Cloud Accounts (T1078.004) with moderate to high confidence (70%), supported by evidence indicating third-party platform compromise suggests valid account abuse. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Nintendo Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/nintendo/incident/NIN1781814318
- Nintendo CyberSecurity Rating page: https://www.rankiteo.com/company/nintendo
- Nintendo Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/nin1781814318-nintendo-of-america-breach-october-2025/
- Nintendo CyberSecurity Score History: https://www.rankiteo.com/company/nintendo/history
- Nintendo CyberSecurity Incident Source: https://www.bleepingcomputer.com/news/security/nintendo-confirms-data-stolen-in-webmd-subsidiary-cyberattack/
- 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