A previously undocumented threat cluster dubbed UAT-10362 has been attributed to spear-phishing campaigns targeting Taiwanese non-governmental organizations (NGOs) and suspected universities to deploy a new Lua-based malware called LucidRook.

"LucidRook is a sophisticated stager that embeds a Lua interpreter and Rust-compiled libraries within a dynamic-link library (DLL) to download and execute staged Lua bytecode payloads," Cisco Talos researcher Ashley Shen said.

The cybersecurity company said it discovered the activity in October 2025, with the attack using RAR or 7-Zip archives lures to deliver a dropper called LucidPawn, which then opens a decoy file and launches LucidRook. A notable characteristic of the intrusion set is the use of DLL side-loading to execute both LucidPawn and LucidRook.