Incident Score: Analysis & Impact (MIC1770890241)

In this Rankiteo incident briefing, we review the Email Signature Management for Microsoft 365 / Outlook / Entra ID | by Xink breach identified under incident ID MIC1770890241.

The analysis begins with a detailed overview of Email Signature Management for Microsoft 365 / Outlook / Entra ID | by Xink's information like the linkedin page: https://www.linkedin.com/company/microsoft-outlook-365, the number of followers: 64, the industry type: IT Services and IT Consulting and the number of employees: None 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 752 and after the incident was 729 with a difference of -23 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 Email Signature Management for Microsoft 365 / Outlook / Entra ID | by Xink and their customers.

Microsoft recently reported "Microsoft Outlook Add-In Hijacked to Steal Thousands of Credentials and Payment Data", a noteworthy cybersecurity incident.

Security researchers at Koi Security uncovered a novel attack leveraging a dormant Microsoft Outlook add-in to harvest over 4,000 login credentials, credit card numbers, and banking security answers.

The disruption is felt across the environment, affecting Microsoft Outlook with AgreeTo add-in installed, and exposing 4,000+ login credentials, credit card numbers, banking security answers, IP addresses, with nearly 4,000+ records at risk.

In response, moved swiftly to contain the threat with measures like Microsoft removed the add-in from its store.

The case underscores how Ongoing (researchers accessed exfiltration channel), teams are taking away lessons such as Office add-ins function as remote dynamic dependencies, allowing content to change without oversight. Microsoft’s security review process only validates manifests upon initial submission, leaving room for post-deployment tampering, and recommending next steps like Implement ongoing security validation for third-party add-ins, Monitor for expired domains associated with add-ins and Restrict add-in permissions to least privilege.

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.