AT&T Breach Incident Score: Analysis & Impact (ATT1764781901)

In this Rankiteo incident briefing, we review the AT&T breach identified under incident ID ATT1764781901.

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 331 and after the incident was 261 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 AT&T and their customers.

On 01 March 2024, AT&T disclosed Data Breach issues under the banner "AT&T Data Breach Settlement".

AT&T faced two major data breaches in 2024, exposing personal information and call/text records of millions of customers.

The disruption is felt across the environment, affecting Third-party cloud platform workspace, and exposing Personal information, call and text records, with nearly 73 million (first breach), 110 million (second breach) records at risk, plus an estimated financial loss of $177 million settlement.

In response, and stakeholders are being briefed through Public disclosure via settlement website.

The case underscores how Settled, with advisories going out to stakeholders covering Claims deadline: December 18, 2024.

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 Trusted Relationship (T1199) with high confidence (90%), supported by evidence indicating illegally downloaded from our workspace on a third-party cloud platform. Under the Exfiltration tactic, the analysis identified Transfer Data to Cloud Account (T1537) with moderate to high confidence (80%), supported by evidence indicating illegally downloaded from our workspace on a third-party cloud platform and Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating information was released on the dark web. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with moderate confidence (60%), supported by evidence indicating third-party cloud platform compromise likely involved stolen credentials. Under the Impact tactic, the analysis identified Data Destruction (T1485) with moderate confidence (50%), supported by evidence indicating exposed personal information for millions of current and former customers and Data Encrypted for Impact (T1486) with lower confidence (30%), supported by evidence indicating no direct evidence, but high-impact breach suggests potential encryption bypass. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.