Bell Breach Incident Score: Analysis & Impact (BEL1773383385)

In this Rankiteo incident briefing, we review the Bell breach identified under incident ID BEL1773383385.

The analysis begins with a detailed overview of Bell's information like the linkedin page: https://www.linkedin.com/company/bell, the number of followers: 363183, the industry type: Telecommunications and the number of employees: 33894 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 676 and after the incident was 510 with a difference of -166 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 Bell and their customers.

Bell Ambulance recently reported "Bell Ambulance Suffers Major Data Breach in Medusa Ransomware Attack", a noteworthy cybersecurity incident.

In February 2025, Wisconsin-based Bell Ambulance, a leading emergency medical services provider, fell victim to a cyberattack by the Medusa ransomware-as-a-service operation.

The disruption is felt across the environment, and exposing Sensitive data of 237,830 individuals, including Social Security numbers, financial account details, driver’s license numbers, medical records, and health insurance information, with nearly 237,830 records at risk.

In response, and stakeholders are being briefed through Breach notifications sent to affected individuals.

The case underscores how with advisories going out to stakeholders covering Breach notifications sent 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.

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 fell victim to a cyberattack by the Medusa ransomware-as-a-service operation and Valid Accounts (T1078) with moderate confidence (60%), supported by evidence indicating ransomware-as-a-service operation likely used compromised credentials. Under the Execution tactic, the analysis identified User Execution: Malicious File (T1204.002) with moderate to high confidence (70%), supported by evidence indicating medusa ransomware attack; likely involved malicious payload execution. Under the Credential Access tactic, the analysis identified OS Credential Dumping (T1003) with moderate confidence (60%), supported by evidence indicating sensitive data including SSNs, financial details, and medical records compromised and Credentials from Password Stores (T1555) with moderate confidence (50%), supported by evidence indicating high-value data exfiltrated suggests access to stored credentials. Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating 219 GB of data exfiltrated, including medical records and SSNs and Data from Information Repositories (T1213) with moderate to high confidence (70%), supported by evidence indicating health insurance information and financial account details compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating 219 GB of data exfiltrated by Medusa ransomware group and Exfiltration Over Web Service (T1567) with moderate confidence (60%), supported by evidence indicating ransomware group threatened to leak stolen data. Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with moderate to high confidence (70%), supported by evidence indicating medusa ransomware attack; likely involved data encryption and Inhibit System Recovery (T1490) with moderate confidence (50%), supported by evidence indicating ransomware attack threatening organizations existence. Under the Command and Control tactic, the analysis identified Application Layer Protocol (T1071) with moderate to high confidence (70%), supported by evidence indicating ransomware-as-a-service operation likely used C2 channels. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.