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Analyze » Cornerstone Healthcare Group » CHG1773189368

Incident Score: Analysis & Impact (CHG1773189368)

The details regarding individual company incidents & reports gives you full view from every side.

Rankiteo Score Impact Analysis

Rankiteo Incident Impact-134
Company Score Before Incident720 / 1000
Company Score After Incident586 / 1000
Company LinkView Cornerstone Healthcare Group Profile
INCIDENT NUMBERCHG1773189368
Type of Cyber IncidentBreach
ATTACK VECTORNA
DATA EXPOSEDPersonal information of nearly 500,000...
INCIDENT DATE30/09/2025
STATUSpublished

Key Highlights From The Incident Analysis

  • Timeline of Cornerstone Healthcare Group'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 Cornerstone Healthcare Group 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 Cornerstone Healthcare Group breach identified under incident ID CHG1773189368.

The analysis begins with a detailed overview of Cornerstone Healthcare Group's information like the linkedin page: https://www.linkedin.com/company/chghospitals, the number of followers: 9918, the industry type: Hospitals and Health Care and the number of employees: 638 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 720 and after the incident was 586 with a difference of -134 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 Cornerstone Healthcare Group and their customers.

Cornerstone Specialty Hospitals recently reported "Cornerstone Specialty Hospitals Data Breach Lawsuit Settlement", a noteworthy cybersecurity incident.

Cornerstone Specialty Hospitals has agreed to a $2.35 million settlement in a class action lawsuit stemming from a data breach that compromised the personal information of nearly 500,000 individuals.

The disruption is felt across the environment, and exposing Personal information of nearly 500,000 individuals, with nearly 490,000 records at risk, plus an estimated financial loss of $2.35 million.

Formal response steps have not been shared publicly yet.

Overall, the incident is a reminder of why proactive monitoring and strong governance matter.

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 (T1078) with moderate confidence (60%), supported by evidence indicating compromised the personal information of nearly 500,000 individuals and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating details on the exact timeline and cause of the exposure remain undisclosed. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (60%), supported by evidence indicating sensitive data exposed in healthcare sector with high regulatory scrutiny and OS Credential Dumping (T1003) with moderate confidence (50%), supported by evidence indicating personal information of nearly 500,000 individuals compromised. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (70%), supported by evidence indicating personal information, sensitive data compromised and Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating healthcare provider with high sensitivity of data. 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 nearly 500,000 individuals and Exfiltration Over Web Service (T1567) with moderate confidence (50%), supported by evidence indicating details on data exfiltration remain undisclosed. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (40%), supported by evidence indicating significant financial and reputational risks post-breach and Data Manipulation (T1565) with lower confidence (30%), supported by evidence indicating high-profile data breach lawsuit settlement. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.

Initial Access
Valid Accounts (60%)
Exploit Public-Facing Application (50%)
Credential Access
Unsecured Credentials (60%)
OS Credential Dumping (50%)
Collection
Data from Local System (70%)
Data from Information Repositories (70%)
Exfiltration
Exfiltration Over C2 Channel (70%)
Exfiltration Over Web Service (50%)
Impact
Data Destruction (40%)
Data Manipulation (30%)

Sources & References