Incident Score: Analysis & Impact (TELTEL1789424936)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of TELUS'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 TELUS 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 TELUS breach identified under incident ID TELTEL1789424936.
The analysis begins with a detailed overview of TELUS's information like the linkedin page: https://www.linkedin.com/company/telus, the number of followers: 442319, the industry type: Telecommunications and the number of employees: 38811 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 755 and after the incident was 699 with a difference of -56 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 TELUS and their customers.
Telus recently reported "Telus Account Breach Affecting Personal and Financial Data", a noteworthy cybersecurity incident.
Telus, one of Canada’s largest telecommunications providers, notified customers of a data breach affecting consumer telecom accounts between February 2025 and June 2026.
The disruption is felt across the environment, affecting Consumer telecom accounts, and exposing Personal and financial data.
In response, moved swiftly to contain the threat with measures like Reset compromised credentials, and began remediation that includes Enhanced security monitoring for impacted users, and stakeholders are being briefed through Customer notifications.
The case underscores how Ongoing, with advisories going out to stakeholders covering Victims offered complimentary identity theft protection services.
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 high confidence (90%), supported by evidence indicating attackers used compromised credentials to access sensitive information and Brute Force: Credential Stuffing (T1110.004) with moderate to high confidence (80%), supported by evidence indicating breach appears to stem from a credential stuffing or account takeover campaign. Under the Credential Access tactic, the analysis identified Brute Force (T1110) with moderate to high confidence (80%), supported by evidence indicating credential stuffing or account takeover campaign and Compromise Accounts (T1586) with moderate to high confidence (70%), supported by evidence indicating compromised credentials to access sensitive information. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating names, account numbers, phone numbers, billing addresses, email addresses, partial payment card details. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating stolen data was exploited to persuade customers to switch providers. Under the Impact tactic, the analysis identified Service Stop (T1489) with moderate confidence (60%), supported by evidence indicating unauthorized changes to their services and Data Manipulation: Stored Data Manipulation (T1565.001) with moderate to high confidence (70%), supported by evidence indicating make unauthorized changes to their services. Under the Defense Evasion tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (80%), supported by evidence indicating attackers used compromised credentials to access sensitive information. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- TELUS Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/telus/incident/TELTEL1789424936
- TELUS CyberSecurity Rating page: https://www.rankiteo.com/company/telus
- TELUS Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/teltel1789424936-telus-telus-digital-breach-february-2025/
- TELUS CyberSecurity Score History: https://www.rankiteo.com/company/telus/history
- TELUS CyberSecurity Incident Source: https://www.securityweek.com/telus-warns-customers-of-account-breaches/
- 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