NORTH KOREA'S HANGRO REVISITED

Summary from the TLDR InfoSec newsletter

Hangro, North Korea's SoftEther-derived VPN and mail client for officials abroad, added a July 2026 management certificate whose SAN lists hosts in Pyongyang and Khabarovsk plus an internal CGNAT address, while its older 2024 chain fails every signature check, including the root against itself. Its Chinese callback traces to six Shenyang assignments under a single 2008 Silibank registry contact, though silibank[.]com lapsed and was re-registered in 2023. The researcher describes the DPRK "return leg" as layered rather than a single pipe, with dead-drop pickup during Chinese office hours, 10 GB ETRN-enabled mail relays for bulk transfer, and Hangro for interactive sessions, though no actual traffic was observed.