Incident Score: Analysis & Impact (TSUTSU1774657901)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of TSU ONE'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 TSU ONE 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 TSU ONE breach identified under incident ID TSUTSU1774657901.
The analysis begins with a detailed overview of TSU ONE's information like the linkedin page: https://www.linkedin.com/company/tsuone, the number of followers: 980, the industry type: Utilities and the number of employees: 66 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 754 and after the incident was 633 with a difference of -121 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 TSU ONE and their customers.
On 25 March 2026, TSU One Holdings LLC (Texas State Utilities Inc.) disclosed Data Breach, Ransomware issues under the banner "TSU One Holdings Data Breach Exposes Sensitive Personal Information".
TSU One Holdings LLC, a Fort Worth, Texas-based utility services and contracting company, recently disclosed a data breach affecting thousands of individuals.
The disruption is felt across the environment, and exposing Sensitive personal information, financial information, with nearly 2,886 (Texas residents confirmed) records at risk.
In response, and stakeholders are being briefed through U.S. Mail notifications to affected individuals.
The case underscores how with advisories going out to stakeholders covering U.S. Mail notifications 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 Exploit Public-Facing Application (T1190) with moderate confidence (50%), supported by evidence indicating qilin ransomware group claimed responsibility for exfiltrating data and Valid Accounts (T1078) with moderate confidence (60%), supported by evidence indicating unauthorized access timeline not publicly confirmed. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate to high confidence (70%), supported by evidence indicating social Security numbers, driver’s license numbers compromised and OS Credential Dumping (T1003) with moderate confidence (60%), supported by evidence indicating financial information (account and payment card details) exposed. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating names, Social Security numbers, financial information compromised and Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating data exfiltrated from Texas State Utilities Inc.. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating qilin ransomware group claimed responsibility for exfiltrating data and Exfiltration Over Web Service (T1567) with moderate confidence (60%), supported by evidence indicating data breach affecting 2,886 Texas residents. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with moderate confidence (50%), supported by evidence indicating incident type listed as Ransomware and Defacement (T1491) with lower confidence (40%), supported by evidence indicating qilin ransomware group claimed responsibility on the dark web. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with moderate confidence (60%), supported by evidence indicating ransomware strain identified as Qilin and Hide Artifacts (T1564) with moderate confidence (50%), supported by evidence indicating exact timeline of unauthorized access not confirmed. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- TSU ONE Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/tsuone/incident/TSUTSU1774657901
- TSU ONE CyberSecurity Rating page: https://www.rankiteo.com/company/tsuone
- TSU ONE Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/tsutsu1774657901-tsu-one-holdings-llc-texas-state-utilities-inc-ransomware-january-2026/
- TSU ONE CyberSecurity Score History: https://www.rankiteo.com/company/tsuone/history
- TSU ONE CyberSecurity Incident Source: https://www.claimdepot.com/data-breach/tsu-one-holdings-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