Incident Score: Analysis & Impact (NET2040020112725)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Netmarble'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 Netmarble 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 Netmarble breach identified under incident ID NET2040020112725.
The analysis begins with a detailed overview of Netmarble's information like the linkedin page: https://www.linkedin.com/company/netmarble-games, the number of followers: 8272, the industry type: Information Technology & Services and the number of employees: 431 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 757 and after the incident was 700 with a difference of -57 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 Netmarble and their customers.
On 27 November 2025, Netmarble disclosed Data Breach issues under the banner "Netmarble Data Breach Affecting Legacy PC Gaming Platform".
Netmarble disclosed a data breach affecting its PC gaming platform, exposing customer names, birth dates, and encrypted passwords.
The disruption is felt across the environment, affecting Legacy PC gaming platform, and exposing Customer names, Birth dates and Encrypted passwords.
In response, and stakeholders are being briefed through Public disclosure (with delay).
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 Exploit Public-Facing Application (T1190) with moderate to high confidence (75%), supported by evidence indicating legacy PC gaming platform affected; no ransomware but vulnerabilities in legacy systems highlighted. Under the Credential Access tactic, the analysis identified Unsecured Credentials: Credentials In Files (T1552.001) with moderate to high confidence (85%), supported by evidence indicating encrypted passwords exposed in breach; legacy system vulnerabilities implied. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating customer names, birth dates, and encrypted passwords exfiltrated from legacy platform. Under the Exfiltration tactic, the analysis identified Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted/Obfuscated Non-C2 Protocol (T1048.003) with moderate to high confidence (70%), supported by evidence indicating data exfiltration such as Likely (data exposed) with no mention of encryption-in-transit. Under the Impact tactic, the analysis identified Data Destruction (T1485) with lower confidence (10%), supported by evidence indicating no ransomware/financial theft, but reputational damage and legal repercussions noted and Network Denial of Service: Disruption of Service (T1498.002) with lower confidence (20%), supported by evidence indicating criticism for disclosure delay implies operational disruption (regulatory non-compliance). These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Netmarble Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/netmarble-games/incident/NET2040020112725
- Netmarble CyberSecurity Rating page: https://www.rankiteo.com/company/netmarble-games
- Netmarble Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/net2040020112725-netmarble-breach-june-2025/
- Netmarble CyberSecurity Score History: https://www.rankiteo.com/company/netmarble-games/history
- Netmarble CyberSecurity Incident Source: https://www.mlex.com/mlex/data-privacy-security/articles/2416127/south-korean-gaming-giant-netmarble-faces-criticism-over-breach-disclosure-delay
- 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