Incident Score: Analysis & Impact (FRO1778783685)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Frost'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 Frost 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 Frost breach identified under incident ID FRO1778783685.
The analysis begins with a detailed overview of Frost's information like the linkedin page: https://www.linkedin.com/company/frostbank, the number of followers: 45186, the industry type: Financial Services and the number of employees: 5095 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 782 and after the incident was 712 with a difference of -70 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 Frost and their customers.
On 26 March 2026, Cullen/Frost Bankers, Inc. disclosed Data Breach issues under the banner "Cullen/Frost Bankers Data Breach Exposes Sensitive Information of Nearly 4,700 Individuals".
Cullen/Frost Bankers, Inc., a Texas-based financial holding company and parent of Frost Bank, recently disclosed a data breach affecting 4,698 individuals in the U.S.
The disruption is felt across the environment, and exposing Sensitive personally identifiable information (PII), with nearly 4698 records at risk.
Formal response steps have not been shared publicly yet.
The case underscores how Ongoing.
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 sensitive personally identifiable information (PII) of current and former clients and Exploit Public-Facing Application (T1190) with lower confidence (40%), supported by evidence indicating company has not publicly revealed the cause or specifics of the breach. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (50%), supported by evidence indicating personally Identifiable Information (PII) compromised and OS Credential Dumping (T1003) with lower confidence (40%), supported by evidence indicating sensitive personally identifiable information (PII) exposed. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (70%), supported by evidence indicating 4,698 individuals sensitive PII compromised and Data from Information Repositories (T1213) with moderate confidence (60%), supported by evidence indicating financial holding company with banking and wealth management 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 affecting 4,698 individuals and Transfer Data to Cloud Account (T1537) with moderate confidence (50%), supported by evidence indicating company has not revealed specifics of the breach. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating high sensitivity of compromised PII and Data Manipulation: Transmitted Data Manipulation (T1565.002) with lower confidence (40%), supported by evidence indicating potential legal claims and compensation for affected individuals. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Frost Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/frostbank/incident/FRO1778783685
- Frost CyberSecurity Rating page: https://www.rankiteo.com/company/frostbank
- Frost Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/fro1778783685-cullenfrost-bankers-inc-breach-march-2026/
- Frost CyberSecurity Score History: https://www.rankiteo.com/company/frostbank/history
- Frost CyberSecurity Incident Source: https://www.claimdepot.com/investigations/frost-bank-data-breach-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