Incident Score: Analysis & Impact (HOL1777991452)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Holston Medical 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 Holston Medical 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 Holston Medical Group breach identified under incident ID HOL1777991452.
The analysis begins with a detailed overview of Holston Medical Group's information like the linkedin page: https://www.linkedin.com/company/holston-medical-group, the number of followers: 4847, the industry type: Medical Practices and the number of employees: 665 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 758 and after the incident was 691 with a difference of -67 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 Holston Medical Group and their customers.
On 29 April 2026, Tri-Cities Gastroenterology disclosed Data Breach issues under the banner "Tri-Cities Gastroenterology Data Breach Exposes Sensitive Patient Information".
Tri-Cities Gastroenterology, a healthcare provider with five offices in northeast Tennessee, experienced a data breach where an unauthorized third party accessed and exfiltrated files containing sensitive patient information.
The disruption is felt across the environment, and exposing Highly sensitive personal and medical information.
In response, and stakeholders are being briefed through Notification to affected individuals.
The case underscores how Concluded, with advisories going out to stakeholders covering Notification to affected individuals.
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 unauthorized third party accessed and exfiltrated files from the company’s network and Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating ongoing vulnerabilities in healthcare data security. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate to high confidence (70%), supported by evidence indicating unauthorized third party accessed...files from the company’s network and OS Credential Dumping (T1003) with moderate confidence (50%), supported by evidence indicating highly sensitive personal and medical information compromised. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating files containing sensitive patient information...exfiltrated and Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating medical record numbers, Social Security numbers compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating unauthorized third party...exfiltrated files from the company’s network and Exfiltration Over Web Service (T1567) with moderate confidence (60%), supported by evidence indicating data breach...poses significant risks for identity theft. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (40%), supported by evidence indicating unauthorized third party accessed and exfiltrated files and Data Manipulation: Stored Data Manipulation (T1565.001) with lower confidence (30%), supported by evidence indicating highly sensitive personal and medical information compromised. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Holston Medical Group Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/holston-medical-group/incident/HOL1777991452
- Holston Medical Group CyberSecurity Rating page: https://www.rankiteo.com/company/holston-medical-group
- Holston Medical Group Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/hol1777991452-tri-cities-gastroenterology-breach-december-2025/
- Holston Medical Group CyberSecurity Score History: https://www.rankiteo.com/company/holston-medical-group/history
- Holston Medical Group CyberSecurity Incident Source: https://www.classaction.org/data-breach-lawsuits/tri-cities-gastroenterology-april-2026
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf