Incident Score: Analysis & Impact (MOZ1779280296)
The details regarding individual company incidents & reports gives you full view from every side.
Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Mozilla's Cyber Attack 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 Mozilla 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 Mozilla breach identified under incident ID MOZ1779280296.
The analysis begins with a detailed overview of Mozilla's information like the linkedin page: https://www.linkedin.com/company/mozilla-corporation, the number of followers: 441195, the industry type: Software Development and the number of employees: 1762 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 733 with a difference of -19 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 Mozilla and their customers.
Firefox Users recently reported "GhostPoster Campaign Exploits Firefox Extensions with Steganography, Infecting 50,000+ Users", a noteworthy cybersecurity incident.
Researchers at Koi have exposed GhostPoster, a large-scale malware campaign targeting Firefox users through malicious browser extensions.
The disruption is felt across the environment, affecting Firefox browsers with malicious extensions installed, and exposing Browser session data, tracking information, potential remote code execution access.
Formal response steps have not been shared publicly yet.
The case underscores how Ongoing (extensions still available on Firefox Add-ons marketplace), teams are taking away lessons such as The incident highlights the risks of implicit trust in browser extensions and the need for zero-trust principles in cybersecurity. Steganography and evasion tactics like low-frequency payload downloads make detection difficult. Stricter vetting of extensions in marketplaces is necessary, and recommending next steps like Implement zero-trust principles for browser extensions, Enhance marketplace vetting processes for extensions and Monitor for steganography-based attacks in browser environments.
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 Drive-by Compromise (T1189) with high confidence (90%), supported by evidence indicating extensions load their icon files, which contain hidden JavaScript...executes upon each extension load and User Execution: Malicious File (T1204.002) with moderate to high confidence (80%), supported by evidence indicating infecting over 50,000 users via seemingly legitimate add-ons. Under the Execution tactic, the analysis identified JavaScript (T1059.007) with high confidence (95%), supported by evidence indicating hidden executable JavaScript within PNG icon files...code executes upon each extension load and User Execution: Malicious File (T1204.002) with moderate to high confidence (80%), supported by evidence indicating malicious browser extensions...delivering a multi-stage malware payload. Under the Persistence tactic, the analysis identified Browser Extensions (T1176) with high confidence (90%), supported by evidence indicating campaign spans at least 17 Firefox extensions...remains available on Firefox Add-ons marketplace. Under the Defense Evasion tactic, the analysis identified Steganography (T1027.003) with high confidence (95%), supported by evidence indicating steganography hiding executable JavaScript within PNG icon files to evade detection, Obfuscated Files or Information (T1027) with high confidence (90%), supported by evidence indicating payloads are obfuscated via Base64, XOR encryption, and runtime ID-based encoding, and Time Based Evasion (T1497.003) with moderate to high confidence (80%), supported by evidence indicating malware checks in every 48 hours and downloads payloads just 10% of the time. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with high confidence (90%), supported by evidence indicating retrieves additional payloads from attacker-controlled domains (liveupdt.com or dealctr.com) and Ingress Tool Transfer (T1105) with moderate to high confidence (85%), supported by evidence indicating embedded script retrieves additional payloads from attacker-controlled domains. Under the Collection tactic, the analysis identified Automated Collection (T1119) with moderate to high confidence (70%), supported by evidence indicating browser session data, tracking information, potential remote code execution access and Browser Session Hijacking (T1185) with moderate to high confidence (80%), supported by evidence indicating malware hijacks affiliate links, injects tracking code (using Google Analytics IDs). Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (70%), supported by evidence indicating data exfiltration, remote code execution...payloads retrieved from attacker-controlled domains. Under the Impact tactic, the analysis identified Resource Hijacking (T1496) with moderate to high confidence (80%), supported by evidence indicating affiliate link hijacking, ad fraud, CAPTCHA bypass and Transmitted Data Manipulation (T1565.002) with moderate to high confidence (70%), supported by evidence indicating injects tracking code, strips security headers (e.g., Content-Security-Policy). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Mozilla Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/mozilla-corporation/incident/MOZ1779280296
- Mozilla CyberSecurity Rating page: https://www.rankiteo.com/company/mozilla-corporation
- Mozilla Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/moz1779280296-mozilla-cyber-attack-december-2025/
- Mozilla CyberSecurity Score History: https://www.rankiteo.com/company/mozilla-corporation/history
- Mozilla CyberSecurity Incident Source: https://www.esecurityplanet.com/threats/ghostposter-malware-hit-50k-users-via-firefox-extension-icons/
- 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