Corewell Health Breach Incident Score: Analysis & Impact (OLECOR1774672026)

In this Rankiteo incident briefing, we review the Corewell Health breach identified under incident ID OLECOR1774672026.

The analysis begins with a detailed overview of Corewell Health's information like the linkedin page: https://www.linkedin.com/company/corewell-health, the number of followers: 66399, the industry type: Hospitals and Health Care and the number of employees: 41961 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 713 and after the incident was 652 with a difference of -61 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 Corewell Health and their customers.

Corewell Health recently reported "Corewell Health Data Breach Exposes Thousands of Patients’ Sensitive Information", a noteworthy cybersecurity incident.

In early 2024, Corewell Health disclosed a data breach affecting approximately 19,000 patients, stemming from a security incident at its former vendor, Pinnacle Holdings.

The disruption is felt across the environment, and exposing Names, contact details, Social Security numbers, medical records, and insurance information, with nearly 19000 records at risk.

In response, moved swiftly to contain the threat with measures like Additional safeguards implemented, and began remediation that includes Review to identify impacted individuals, notification by mail, free credit monitoring and identity protection services, and stakeholders are being briefed through Notification by mail, dedicated call center (866-686-2607), support on Pinnacle Holdings’ website.

The case underscores how teams are taking away lessons such as Highlights ongoing risks in third-party vendor security within the healthcare sector, with advisories going out to stakeholders covering Affected patients were notified by mail and offered free credit monitoring and identity protection services. Additional support is available through a dedicated call center at 866-686-2607 and on Pinnacle Holdings’ website.

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 Supply Chain Compromise (T1195) with high confidence (90%), supported by evidence indicating breach stemming from a security incident at its former vendor, Pinnacle Holdings. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate to high confidence (70%), supported by evidence indicating social Security numbers, medical records, and insurance information compromised and OS Credential Dumping (T1003) with moderate confidence (60%), supported by evidence indicating names, contact details, Social Security numbers exposed. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating names, contact details, Social Security numbers, medical records compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating data breach affecting approximately 19,000 patients and Transfer Data to Cloud Account (T1537) with moderate confidence (50%), supported by evidence indicating third-party vendor security incident within the healthcare sector. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (40%), supported by evidence indicating no evidence of fraudulent activity, but sensitive data exposed and Stored Data Manipulation (T1565.001) with moderate confidence (50%), supported by evidence indicating medical records and insurance information compromised. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.