According to Wu, Slow Mist's Chief Information Security Officer 23pds stated that a member of the suspected North Korean hacker group Kimsuky APT has encountered a significant data breach, with hundreds of GB of internal files and tools leaked. Analysis shows that the intrusion occurred in early June 2025, exposing their backdoor, phishing framework, and reconnaissance operation details. The leaked data comes from two compromised systems of the Kimsuky operator known by the alias "KIM", which include a Linux development workstation running Deepin 20.9, and a public VPS used for spear phishing activities.