FBI, DC3, and NPA Identification of North Korean Cyber Actors, Tracked as TraderTraitor, Responsible for Theft of $308 Million USD from Bitcoin.DMM.com — FBI

The Federal Bureau of Investigation, Department of Defense Cyber Crime Center, and National Police Agency of Japan are alerting the public to the theft of cryptocurrency worth $308 million U.S. dollars from the Japan-based cryptocurrency company DMM by North Korean cyber actors in May 2024. The theft is affiliated with TraderTraitor threat activity, which is also tracked as Jade Sleet, UNC4899, and Slow Pisces.

TraderTraitor activity is often characterized by targeted social engineering directed at multiple employees of the same company simultaneously.

In late March 2024, a North Korean cyber actor, masquerading as a recruiter on LinkedIn, contacted an employee at Ginco, a Japan-based enterprise cryptocurrency wallet software company.

After mid-May 2024, TraderTraitor actors exploited session cookie information to impersonate the compromised employee

In late-May 2024, the actors likely used this access to manipulate a legitimate transaction request by a DMM employee, resulting in the loss of 4,502.9 BTC, worth $308 million at the time of the attack.