New MODBEACON RAT Uses gRPC Streaming for Encrypted C2 Traffic
The China-linked cybercrime group known as Silver Fox has been attributed to a new Rust-based remote access trojan (RAR) called MODBEACON . Chinese cybersecurity company QiAnXin said that while the threat cluster may appear like a low-sophistication, high-activity operation that propagates malware via counterfeit installers using SEO poisoning techniques, it belies their true organizational structure , which compromises multiple distributors. "These distributors conduct activities across Asia using counterfeit software installers distributed through SEO campaigns, leveraging variants of Gh0st RAT and WinOS (ValleyRAT) trojan families," QiAnXin said . One such campaign observed in mid-June 2026 involved a distributor delivering a previously undocumented modular RAT targeting technology, education, and state-owned enterprises in the country. MODBEACON's requested command-and-control (C2) infrastructure is hosted on Amazon and Cloudflare's Content Delivery Networ...
î Jul 10, 2026