Corewell Health Breach Incident Score: Analysis & Impact (PINCOR1774758354)

In this Rankiteo incident briefing, we review the Corewell Health breach identified under incident ID PINCOR1774758354.

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 677 and after the incident was 616 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.

On 25 November 2024, Corewell Health disclosed Data Breach issues under the banner "Corewell Health Data Breach Exposes Personal and Medical Data of 19,000 Patients".

A data breach at Pinnacle Holdings, LTD, a former healthcare consulting provider for Michigan-based Corewell Health, has compromised the sensitive information of approximately 19,000 Corewell Health patients.

The disruption is felt across the environment, and exposing Personal and medical data of 19,000 patients, with nearly 19,000 records at risk.

In response, moved swiftly to contain the threat with measures like Additional safeguards implemented to prevent future incidents, and stakeholders are being briefed through Notifying impacted individuals and offering free credit monitoring and identity protection services.

The case underscores how Ongoing, with advisories going out to stakeholders covering Affected patients are being offered free credit monitoring and identity protection services. Contact Pinnacle Holdings at 866-686-2607 for more information.

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 Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating network disruption affecting certain systems at Pinnacle Holdings and Trusted Relationship (T1199) with moderate to high confidence (80%), supported by evidence indicating former healthcare consulting provider for Corewell Health compromised. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate confidence (60%), supported by evidence indicating unauthorized individual may have accessed patient data and OS Credential Dumping (T1003) with moderate confidence (50%), supported by evidence indicating social Security numbers, driver’s license numbers compromised. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating names, phone numbers, health insurance details, prescription info compromised and Data from Information Repositories (T1213) with moderate to high confidence (80%), supported by evidence indicating 19,000 patients personal and medical data exposed. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating data breach impacting 19,000 patients detected and Transfer Data to Cloud Account (T1537) with lower confidence (40%), supported by evidence indicating unauthorized individual may have accessed patient data. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating network disruption affecting certain systems and Data Manipulation: Stored Data Manipulation (T1565.001) with lower confidence (40%), supported by evidence indicating no evidence of fraudulent activity resulting from the breach. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.