Cyber Incident Victim: South Korea's Defense Integrated Data Center
Date:
Oct 2017
Location:
South Korea
Summary
A North Korean hacking operation infiltrated South Korea's Defense Integrated Data Center, stealing classified military documents including sensitive wartime operational plans between Seoul and Washington. The compromised data, totaling 235 gigabytes with approximately 80% remaining unidentified, included strategic blueprints for responding to full-scale conflict and localized provocations, special forces contingency plans, reports to allied commanders, and critical infrastructure details. Defense authorities attributed the breach to Pyongyang, acknowledging significant portions of the exfiltrated material remained unanalyzed, prompting concerns over potential adjustments to North Korea's military strategies based on the stolen intelligence.
| CIA Posture | Motives | Tactics, Techniques & Procedures |
|---|---|---|
| Available to members | 1 motive | 1 technique |
| Threat Actor | Type | Location |
|---|---|---|
| 1 actor | Available to members | Available to members |
Description
In September 2016, North Korean hackers breached South Korea’s Defense Integrated Data Center, exfiltrating 235 gigabytes of classified military documents. The stolen data included Operational Plan 5015, the most recent joint wartime contingency blueprint between South Korea and the United States for a full-scale conflict with North Korea, which reportedly outlined strategies to target the North Korean leadership. Operational Plan 3100, detailing South Korea’s response protocols to localized North Korean provocations, was also compromised. Additional compromised materials encompassed contingency plans for South Korean special forces operations, sensitive reports intended for top military commanders of the allied forces, and technical specifications for critical military installations and power plants. Democratic Party lawmaker Lee Cheol-hee disclosed these details in October 2017, citing unnamed defense officials. At the time of his statement, the South Korean Ministry of National Defense had only identified the contents of approximately 53 gigabytes of data, leaving 182 gigabytes—nearly 80% of the stolen material—unanalyzed and its full scope undetermined.
South Korea’s defense authorities publicly attributed the attack to North Korea in May 2017 but initially withheld specifics about the compromised data. The scale of the breach prompted concerns among military analysts that Pyongyang could exploit the stolen operational plans to adjust its own wartime strategies or evasion tactics. The incident underscored vulnerabilities in South Korea’s cyber defenses, particularly regarding high-value military networks storing alliance-sensitive information. In response, Seoul intensified efforts to strengthen its cybersecurity posture, acknowledging a pattern of North Korean cyber operations targeting government and corporate infrastructure, often conducted via personnel operating from third countries like China. The breach amplified calls for sustained vigilance and enhanced coordination between South Korea and the U.S. to mitigate risks posed by the potential tactical advantages gained through the stolen documents.