Incident Score: Analysis & Impact (CAS1788406361)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Castle Group's Ransomware 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 Castle 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 Castle Group breach identified under incident ID CAS1788406361.
The analysis begins with a detailed overview of Castle Group's information like the linkedin page: https://www.linkedin.com/company/castle-group, the number of followers: 27111, the industry type: Real Estate and the number of employees: 1492 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 761 and after the incident was 611 with a difference of -150 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 Castle Group and their customers.
On 26 August 2026, Castle Group disclosed Ransomware issues under the banner "Castle Group Discloses Ransomware Attack Exposing Sensitive Personal Data".
Castle Group, a Florida-based property management company overseeing residential communities nationwide, recently reported a data breach stemming from a ransomware attack.
The disruption is felt across the environment, and exposing Sensitive personal data including names, Social Security numbers, government IDs, financial account details, and health records.
In response, and stakeholders are being briefed through Offering complimentary identity theft protection services through Cyberscout and a dedicated toll-free response line.
The case underscores how Ongoing, with advisories going out to stakeholders covering Complimentary identity theft protection services and a dedicated toll-free response line.
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 Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating unauthorized access to Castle Group’s network occurred between September 2025 and February 2026 and Valid Accounts (T1078) with moderate confidence (60%), supported by evidence indicating ransomware group Qilin claimed responsibility; likely used compromised credentials. Under the Execution tactic, the analysis identified Ransomware execution via malicious payload (T1204.002) with moderate to high confidence (70%), supported by evidence indicating ransomware attack disclosed; Qilin group claimed responsibility. Under the Credential Access tactic, the analysis identified OS Credential Dumping (T1003) with moderate confidence (60%), supported by evidence indicating sensitive data (SSNs, financial details) compromised; likely credential harvesting and Unsecured Credentials: Credentials In Files (T1552.001) with moderate confidence (50%), supported by evidence indicating network access sustained for months; possible unsecured credentials. Under the Discovery tactic, the analysis identified Account Discovery (T1087) with moderate to high confidence (70%), supported by evidence indicating names, SSNs, and financial data targeted; likely account enumeration and File and Directory Discovery (T1083) with moderate confidence (60%), supported by evidence indicating health records and government IDs exfiltrated; file system exploration. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating sensitive personal data (SSNs, financial details, health records) compromised and Data Staged: Local Data Staging (T1074.001) with moderate to high confidence (70%), supported by evidence indicating data exfiltration confirmed; likely staged before extraction. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating qilin group claimed responsibility; data exfiltration confirmed and Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) with moderate confidence (50%), supported by evidence indicating dark web post by Qilin; possible cloud-based exfiltration. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with high confidence (90%), supported by evidence indicating ransomware attack disclosed; Qilin group known for encryption-based extortion and Data Destruction (T1485) with lower confidence (40%), supported by evidence indicating ransomware attack; potential data destruction if demands unmet. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate confidence (60%), supported by evidence indicating ransomware attack; likely used obfuscation to evade detection and Impair Defenses: Disable or Modify Tools (T1562.001) with moderate confidence (50%), supported by evidence indicating network access sustained for months; possible defense impairment. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Castle Group Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/castle-group/incident/CAS1788406361
- Castle Group CyberSecurity Rating page: https://www.rankiteo.com/company/castle-group
- Castle Group Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/cas1788406361-castle-group-ransomware-september-2025/
- Castle Group CyberSecurity Score History: https://www.rankiteo.com/company/castle-group/history
- Castle Group CyberSecurity Incident Source: https://www.claimdepot.com/data-breach/castle-group-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