Incident Score: Analysis & Impact (MYE1780504320)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Educational Employees Credit Union'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 Educational Employees Credit Union 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 Educational Employees Credit Union breach identified under incident ID MYE1780504320.
The analysis begins with a detailed overview of Educational Employees Credit Union's information like the linkedin page: https://www.linkedin.com/company/myeecu, the number of followers: 1796, the industry type: Banking and the number of employees: 243 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 755 and after the incident was 688 with a difference of -67 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 Educational Employees Credit Union and their customers.
On 05 December 2025, Educational Employees Credit Union (EECU) disclosed Data Breach issues under the banner "EECU Data Breach Exposes Sensitive Member Information".
On December 5, 2025, Educational Employees Credit Union (EECU) detected unauthorized access to an employee’s email account, revealing a potential data breach.
The disruption is felt across the environment, affecting Employee email account, and exposing Names, addresses, Social Security numbers, driver’s license numbers, financial information.
In response, and stakeholders are being briefed through Notified impacted individuals.
The case underscores how Ongoing, with advisories going out to stakeholders covering Notified impacted individuals.
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: Cloud Accounts (T1078.004) with high confidence (90%), supported by evidence indicating unauthorized access to an employee’s email account and Phishing: Spearphishing Link (T1566.002) with moderate to high confidence (70%), supported by evidence indicating no details on malware’s origin; email account access implies phishing. Under the Credential Access tactic, the analysis identified Brute Force: Password Guessing (T1110.001) with moderate confidence (60%), supported by evidence indicating unauthorized access to an employee’s email account (implied weak credentials) and Credentials from Password Stores (T1555) with moderate confidence (50%), supported by evidence indicating email account access may involve stolen credentials. Under the Collection tactic, the analysis identified Email Collection: Remote Email Collection (T1114.002) with high confidence (90%), supported by evidence indicating unauthorized actor accessed or acquired certain emails and Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating exposed data includes PII and financial information. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating unauthorized actor may have acquired certain emails and Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted/Obfuscated Non-C2 Protocol (T1048.003) with moderate confidence (60%), supported by evidence indicating no details on exfiltration method; emails likely exfiltrated. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating no evidence of data destruction; included due to breach impact and Data Manipulation: Stored Data Manipulation (T1565.001) with lower confidence (40%), supported by evidence indicating heightened risk of identity theft and fraud (implied misuse). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Educational Employees Credit Union Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/myeecu/incident/MYE1780504320
- Educational Employees Credit Union CyberSecurity Rating page: https://www.rankiteo.com/company/myeecu
- Educational Employees Credit Union Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/mye1780504320-educational-employees-credit-union-breach-december-2025/
- Educational Employees Credit Union CyberSecurity Score History: https://www.rankiteo.com/company/myeecu/history
- Educational Employees Credit Union CyberSecurity Incident Source: https://www.prnewswire.com/news-releases/educational-employees-credit-union-data-breach-edelson-lechtzin-llp-launches-investigation-into-exposure-of-personal-information-302790399.html
- 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