Incident Score: Analysis & Impact (KOR1766970764)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Korean Air's Breach 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 Korean Air 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 Korean Air breach identified under incident ID KOR1766970764.
The analysis begins with a detailed overview of Korean Air's information like the linkedin page: https://www.linkedin.com/company/koreanair, the number of followers: 9072, the industry type: Airlines and Aviation and the number of employees: 1 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 747 and after the incident was 656 with a difference of -91 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 Korean Air and their customers.
Korean Air recently reported "Korean Air Employee Data Breach via Third-Party Vendor", a noteworthy cybersecurity incident.
A data breach involving the personal information of Korean Air employees occurred after a cyberattack on KC&D Service, a former in-flight catering subsidiary of Korean Air.
The disruption is felt across the environment, and exposing Names and bank account numbers, with nearly 30,000 records at risk.
In response, teams activated the incident response plan, moved swiftly to contain the threat with measures like Emergency security measures, safety check on service integrations with KC&D, and began remediation that includes Urged KC&D to analyze the incident and prevent recurrence, and stakeholders are being briefed through Internal notice to employees, public statement via representative.
The case underscores how Ongoing, and recommending next steps like Strengthen personal data protection posture, improve third-party vendor security oversight, with advisories going out to stakeholders covering Internal notice to employees, public statement via representative.
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 Supply Chain Compromise (T1195) with high confidence (90%), supported by evidence indicating cyberattack on KC&D Service, a former in-flight catering subsidiary and Supply Chain Compromise: Compromise Software Supply Chain (T1195.002) with moderate to high confidence (70%), supported by evidence indicating third-party vendor (KC&D Service) exploited in the attack. Under the Credential Access tactic, the analysis identified Unsecured Credentials (T1552) with moderate confidence (60%), supported by evidence indicating bank account numbers and names exposed (implied credential exposure). Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating data breach exposing 30,000 employee records (implied exfiltration) and Automated Exfiltration (T1020) with moderate confidence (50%), supported by evidence indicating large-scale data exposure (30,000 records). Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (30%), supported by evidence indicating high identity theft risk noted post-breach and Data Encrypted for Impact (T1486) with lower confidence (20%), supported by evidence indicating no ransomware details, but breach implies potential impact. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Korean Air Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/koreanair/incident/KOR1766970764
- Korean Air CyberSecurity Rating page: https://www.rankiteo.com/company/koreanair
- Korean Air Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/kor1766970764-breach-december-2025/
- Korean Air CyberSecurity Score History: https://www.rankiteo.com/company/koreanair/history
- Korean Air CyberSecurity Incident Source: https://koreajoongangdaily.joins.com/news/2025-12-29/business/industry/Data-breach-at-Korean-Air-leaks-30000-employee-records/2488168
- 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