AT&T Breach Incident Score: Analysis & Impact (ATT1764635319)

In this Rankiteo incident briefing, we review the AT&T breach identified under incident ID ATT1764635319.

The analysis begins with a detailed overview of AT&T's information like the linkedin page: https://www.linkedin.com/company/att, the number of followers: 1591781, the industry type: Telecommunications and the number of employees: 177538 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 267 and after the incident was 218 with a difference of -49 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 AT&T and their customers.

AT&T recently reported "AT&T Data Breaches Settlement", a noteworthy cybersecurity incident.

Millions of AT&T customers may be entitled to receive up to $7,500 after the company was ordered to pay $177 million in a settlement related to two major data breaches.

The disruption is felt across the environment, and exposing True, plus an estimated financial loss of $177 million (settlement amount).

In response, and stakeholders are being briefed through Settlement announcement and extended claims deadline (December 18, 2025).

The case underscores how with advisories going out to stakeholders covering Customers advised to submit claims by December 18, 2025, for potential compensation up to $7,500.

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 Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (85%), with evidence including data compromised such as true, and identity theft risk such as Likely (given customer data exposure). Under the Initial Access tactic, the analysis identified Valid Accounts (T1078) with moderate to high confidence (70%), supported by evidence indicating millions of AT&T customers may be entitled to receive up to $7,500 after... two major data breaches. Under the Collection tactic, the analysis identified Automated Collection (T1119) with moderate to high confidence (75%), with evidence including customers affected such as Millions, and personally identifiable information such as Likely (given settlement context). Under the Impact tactic, the analysis identified Data Encrypted for Impact (T1486) with lower confidence (30%), supported by evidence indicating data Breach type listed, but no explicit ransomware details and Resource Hijacking (T1496) with moderate confidence (60%), supported by evidence indicating $177 million (settlement amount) for two major data breaches. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.