AT&T Breach Incident Score: Analysis & Impact (ATT3032030111625)

In this Rankiteo incident briefing, we review the AT&T breach identified under incident ID ATT3032030111625.

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 169 and after the incident was 121 with a difference of -48 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 Breach Settlement", a noteworthy cybersecurity incident.

AT&T is set to pay a $177 million class action settlement after two alleged data breaches where sensitive customer data was released on the dark web.

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

In response, teams activated the incident response plan, and began remediation that includes Class action settlement ($177M) and Free credit/identity monitoring for affected customers, and stakeholders are being briefed through Public disclosure, Customer advisories (password changes, 2FA, credit freezing) and Website updates with detailed breach information.

The case underscores how Resolved (settlement reached), teams are taking away lessons such as Immediate password changes and 2FA enablement are critical post-breach, Proactive financial monitoring and credit freezing mitigate identity theft risks and Companies should provide clear, detailed breach notifications to guide customer actions, and recommending next steps like Customers should change passwords for all accounts, not just the breached one, if password reuse is suspected, Enable 2FA on all critical accounts to reduce the risk of unauthorized access and Monitor financial accounts for suspicious activity for at least several months post-breach, with advisories going out to stakeholders covering Customers advised to change passwords, enable 2FA, monitor accounts, and freeze credit if necessary.

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 Valid Accounts (T1078) with moderate to high confidence (70%), with evidence including customers were advised to change passwords, enable two-factor authentication (2FA)..., and highly sensitive personal information... exposed and released on the dark web. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Credentials In Files (T1552.001) with moderate confidence (60%), supported by evidence indicating customers were advised to change passwords... implies potential credential exposure. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating social Security numbers, financial data, and other critical customer data... exposed. Under the Exfiltration tactic, the analysis identified Exfiltration Over Alternative Protocol: Exfiltration to Cloud Storage (T1048.003) with moderate to high confidence (85%), with evidence including sensitive customer data was exposed and released on the dark web, and data exfiltration such as true. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating data exfiltration such as true (implied misuse risk, though no explicit destruction mentioned) and Data Manipulation (T1659) with lower confidence (40%), supported by evidence indicating identity theft, financial fraud risks suggest potential misuse of exfiltrated data. Under the Persistence tactic, the analysis identified Steal Web Session Cookie (T1539) with moderate confidence (50%), supported by evidence indicating customers were advised to change passwords, enable 2FA suggests session hijacking risk. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.