Health Care Service Corporation Breach Incident Score: Analysis & Impact (HCS1002310112225)

In this Rankiteo incident briefing, we review the Health Care Service Corporation breach identified under incident ID HCS1002310112225.

The analysis begins with a detailed overview of Health Care Service Corporation's information like the linkedin page: https://www.linkedin.com/company/hcsc, the number of followers: 158363, the industry type: Hospitals and Health Care and the number of employees: 20555 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 788 and after the incident was 715 with a difference of -73 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 Health Care Service Corporation and their customers.

Blue Cross Blue Shield of Montana (BCBSMT) recently reported "Blue Cross Blue Shield of Montana (BCBSMT) Data Breach via Third-Party Vendor Conduent", a noteworthy cybersecurity incident.

A large-scale data breach at Blue Cross Blue Shield of Montana (BCBSMT) compromised the personal and medical information of nearly one-third of Montana's population (~462,000 individuals).

The disruption is felt across the environment, and exposing names, addresses and birth dates, with nearly 462,000 records at risk.

In response, teams activated the incident response plan, while recovery efforts such as AI-powered assistant for consumer inquiries and public awareness campaign continue, and stakeholders are being briefed through urgent questions to BCBSMT/Conduent, public statements and AI assistant (csimt.gov).

The case underscores how ongoing (responses from BCBSMT/Conduent under analysis; potential public hearing), and recommending next steps like Monitor Explanation of Benefits for suspicious activity, Update Montana laws to address AI and cybersecurity gaps (potential 2027 legislative action) and Explore AI for regulatory efficiency (e.g., insurance product reviews), with advisories going out to stakeholders covering Urgent questions sent to BCBSMT/Conduent, Public awareness campaign for affected residents and AI assistant deployed for consumer inquiries.

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%), with evidence including third-party vendor (Conduent) security breach, and attack vector such as third-party vendor (Conduent). Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), with evidence including compromised data includes names, addresses, birth dates, billing/medical data, phone numbers, and pII, PHI, and billing data exposed. 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%), with evidence including data exfiltration such as true, and 462,000 records exposed (PII/PHI/billing). Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (10%), supported by evidence indicating ransomware such as data exfiltration such as true (no encryption confirmed, but exfiltration implies potential dual-use) and Resource Hijacking (T1496) with lower confidence (30%), supported by evidence indicating aI assistant deployed for consumer inquiries (post-breach resource strain implied). 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 vendor (Conduent) breach (likely abused legitimate vendor access). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.