Incident Score: Analysis & Impact (SEFFRO1779972477)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Frost'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 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 SEFFRO1779972477.
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 713 and after the incident was 573 with a difference of -140 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 16 April 2026, Frost Bank disclosed Data Breach and Ransomware issues under the banner "Sefas Data Breach Exposes Nearly 200,000 Frost Bank Customers".
Global software vendor Sefas disclosed a data security incident that compromised sensitive personal information of 191,848 Frost Bank customers.
The disruption is felt across the environment, affecting SFTP server, and exposing Sensitive personal information including names, addresses, Social Security numbers, taxpayer IDs, account numbers, dates of birth, and loan numbers, with nearly 191848 records at risk.
In response, moved swiftly to contain the threat with measures like Breach contained to SFTP server and ceased after April 16, 2026.
The case underscores how Ongoing, with advisories going out to stakeholders covering One year of complimentary identity protection and credit monitoring through CyberScout.
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 (60%), supported by evidence indicating unauthorized access to an SFTP server used for software support and Valid Accounts (T1078) with moderate to high confidence (70%), supported by evidence indicating attackers downloaded files containing customer data over months. Under the Credential Access tactic, the analysis identified Credentials In Files (T1552.001) with moderate to high confidence (80%), supported by evidence indicating sFTP server contained files with SSNs, account numbers, and taxpayer IDs. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating attackers downloaded files containing customer data between Dec 2025-Apr 2026. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating everest ransomware gang claimed exfiltration of 250,000 SSNs and Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002) with moderate confidence (60%), supported by evidence indicating sFTP server used for software support; likely exfil via same channel. 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; Everest gang involvement. Under the Defense Evasion tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (70%), supported by evidence indicating unauthorized access persisted for months without detection. 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/SEFFRO1779972477
- Frost CyberSecurity Rating page: https://www.rankiteo.com/company/frostbank
- Frost Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/seffro1779972477-frost-bank-sefas-ransomware-april-2026/
- Frost CyberSecurity Score History: https://www.rankiteo.com/company/frostbank/history
- Frost CyberSecurity Incident Source: https://www.teiss.co.uk/news/close-to-200000-frost-bank-customers-affected-by-sefas-security-breach-17565
- 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