CoVantage Credit Union Breach Incident Score: Analysis & Impact (COV4964449112725)

In this Rankiteo incident briefing, we review the CoVantage Credit Union breach identified under incident ID COV4964449112725.

The analysis begins with a detailed overview of CoVantage Credit Union's information like the linkedin page: https://www.linkedin.com/company/covantage-credit-union, the number of followers: 3234, the industry type: Financial Services and the number of employees: 307 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 756 and after the incident was 681 with a difference of -75 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 CoVantage Credit Union and their customers.

On 27 October 2025, CoVantage Credit Union disclosed Data Breach issues under the banner "CoVantage Credit Union Data Breach via Third-Party Vendor Marquis Software Solutions".

On Aug.

The disruption is felt across the environment, affecting Marquis Software Solutions' network (third-party vendor), and exposing Names, Addresses and Phone numbers, with nearly At least 22 (New Hampshire); total unknown (likely higher across other states) records at risk.

In response, teams activated the incident response plan, and began remediation that includes Investigation to identify affected individuals and compromised data and Notification to clients and affected members, while recovery efforts such as 24 months of complimentary credit monitoring and identity protection services (via Epiq Privacy Solutions ID), Three-bureau credit monitoring and Credit report and score access continue, and stakeholders are being briefed through Mailed notifications to affected individuals with enrollment instructions, Public disclosure via New Hampshire Attorney General’s website (2025-11-26) and Encouragement for vigilance (monitoring account statements, credit reports, fraud alerts, security freezes).

The case underscores how Ongoing (as of latest disclosure), and recommending next steps like Monitor account statements and credit reports for unauthorized activity, Enroll in complimentary credit monitoring services and Consider placing a fraud alert or security freeze on credit reports, with advisories going out to stakeholders covering Mailed notifications with enrollment instructions for credit monitoring and Dedicated response line (855-403-1764) for questions.

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.

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 Trusted Relationship (T1199) with high confidence (95%), supported by evidence indicating unauthorized third party accessed Marquis’ systems (third-party vendor). Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (95%), supported by evidence indicating acquired files containing sensitive personal information (names, SSNs, financial data). Under the Exfiltration tactic, the analysis identified Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted/Obfuscated Non-C2 Protocol (T1048.003) with moderate to high confidence (85%), supported by evidence indicating unauthorized third party accessed Marquis’ systems and may have acquired files. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (5%), supported by evidence indicating no ransomware or encryption mentioned; data acquired for potential identity theft/fraud and Identity Theft (T1659) with high confidence (95%), supported by evidence indicating high identity theft risk due to exposure of SSNs, financial data, and PII. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Private Keys (T1552.004) with lower confidence (30%), supported by evidence indicating no explicit mention of credentials, but financial account info exposed may imply access. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.