Incident Score: Analysis & Impact (RECCHIATH1775708870)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Chintai'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 Chintai 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 Chintai breach identified under incident ID RECCHIATH1775708870.
The analysis begins with a detailed overview of Chintai's information like the linkedin page: https://www.linkedin.com/company/chintai, the number of followers: 1861, the industry type: IT Services and IT Consulting and the number of employees: 33 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 750 and after the incident was 644 with a difference of -106 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 Chintai and their customers.
On 09 April 2026, SUUMO disclosed Data Breach issues under the banner "Major Data Breach Exposes Personal Information from Japanese Real Estate Platforms".
A significant data breach involving six major Japanese real estate websites (SUUMO, CHINTAI, At Home, HOME’S, Ouchino, and Chintai EX) exposed 2.78GB of data, including 2.4 million records with 976,824 email addresses and sensitive personal details.
The disruption is felt across the environment, affecting Six major Japanese real estate websites (SUUMO, CHINTAI, At Home, HOME’S, Ouchino, Chintai EX), and exposing 2.78GB of data, 2.4 million records, with nearly 2.4 million records, 976,824 email addresses records at risk.
Formal response steps have not been shared publicly yet.
The case underscores how Ongoing.
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 Exploit Public-Facing Application (T1190) with moderate to high confidence (80%), supported by evidence indicating vulnerabilities in a property information-sharing system used exclusively by real estate companies. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate confidence (60%), supported by evidence indicating property information-sharing system used exclusively by real estate companies (implied access). Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating 2.78GB of data, 2.4 million records with PII, demographic data, property preferences and Data from Information Repositories (T1213) with high confidence (90%), supported by evidence indicating customer IDs, registration dates, names, phone numbers, email addresses compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating data sold on dark web for 1,000 euros (approx. ¥185,000) and Exfiltration Over Web Service (T1567) with moderate to high confidence (70%), supported by evidence indicating data breach impacting 2.4 million records, likely exfiltrated via web. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating no details on data integrity post-breach, but large-scale exposure implies risk and Stored Data Manipulation (T1565.001) with lower confidence (40%), supported by evidence indicating property listing URLs and management information compromised. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Chintai Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/chintai/incident/RECCHIATH1775708870
- Chintai CyberSecurity Rating page: https://www.rankiteo.com/company/chintai
- Chintai Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/recchiath1775708870-suumo-chintai-homes-chintai-ex-breach-april-2026/
- Chintai CyberSecurity Score History: https://www.rankiteo.com/company/chintai/history
- Chintai CyberSecurity Incident Source: https://gigazine.net/gsc_news/en/20260409-japanese-estate-platforms-data-breach/
- 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