Incident Score: Analysis & Impact (ZIMSTA1773930456)
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 Zimbra's Vulnerability 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 Zimbra 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 Zimbra breach identified under incident ID ZIMSTA1773930456.
The analysis begins with a detailed overview of Zimbra's information like the linkedin page: https://www.linkedin.com/company/zimbra, the number of followers: 15746, the industry type: Software Development and the number of employees: 118 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 726 and after the incident was 721 with a difference of -5 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 Zimbra and their customers.
Ukraine’s State Hydrographic Service recently reported "Russian APT28 Exploits Zimbra Flaw in Stealthy Phishing Attack on Ukrainian Agency", a noteworthy cybersecurity incident.
A Russian state-backed hacking group, APT28 (also known as Fancy Bear), targeted Ukraine’s State Hydrographic Service in a sophisticated phishing campaign exploiting a cross-site scripting (XSS) vulnerability in Zimbra webmail.
The disruption is felt across the environment, affecting Zimbra webmail, and exposing Login credentials, session tokens, backup 2FA codes, stored passwords, 90 days of mailbox data.
Formal response steps have not been shared publicly yet.
Overall, the incident is a reminder of why proactive monitoring and strong governance matter.
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 Phishing: Spearphishing Link (T1566.002) with high confidence (90%), supported by evidence indicating sophisticated phishing campaign exploiting a cross-site scripting (XSS) vulnerability and Exploit Public-Facing Application (T1190) with high confidence (90%), supported by evidence indicating exploiting a cross-site scripting (XSS) vulnerability in Zimbra webmail (CVE-2025-66376). Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with high confidence (90%), supported by evidence indicating malicious code executed silently when opened in an active Zimbra session. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Credentials In Files (T1552.001) with high confidence (90%), supported by evidence indicating harvest login credentials, session tokens, backup 2FA codes, stored passwords and Steal Web Session Cookie (T1539) with high confidence (90%), supported by evidence indicating session tokens harvested via malicious code in Zimbra webmail. Under the Collection tactic, the analysis identified Email Collection: Remote Email Collection (T1114.002) with high confidence (90%), supported by evidence indicating up to 90 days of mailbox data harvested via Zimbra webmail exploit and Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating stored passwords and backup 2FA codes compromised. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating data exfiltration confirmed, including credentials and mailbox data. Under the Defense Evasion tactic, the analysis identified Obfuscated Files or Information (T1027) with high confidence (90%), supported by evidence indicating malicious code embedded directly in email’s HTML body, bypassing traditional security and Hide Artifacts: Hidden Window (T1564.003) with moderate to high confidence (80%), supported by evidence indicating code executed silently in an active Zimbra session without triggering defenses. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with moderate to high confidence (70%), supported by evidence indicating exploited trusted webmail environment (Zimbra) for C2-like data interception. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Zimbra Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/zimbra/incident/ZIMSTA1773930456
- Zimbra CyberSecurity Rating page: https://www.rankiteo.com/company/zimbra
- Zimbra Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/zimsta1773930456-zimbra-ukraines-state-hydrographic-service-vulnerability-january-2026/
- Zimbra CyberSecurity Score History: https://www.rankiteo.com/company/zimbra/history
- Zimbra CyberSecurity Incident Source: https://therecord.media/russia-hackers-ukraine-zimbra-breach
- 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