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The China-nexus threat cluster UAT-11587 has been conducting targeted attacks against government and policy organizations in eight Asian countries since September 2025. It uses spear-phishing campaigns with political and diplomatic lures to deliver a Rust-compiled backdoor named Antino. Antino uniquely uses Microsoft 365 services such as Outlook and OneDrive for command-and-control communication instead of traditional C2 servers. The backdoor enables reconnaissance, command execution, file transfer, shellcode loading, and persistence. The campaign leverages Cloudflare infrastructure for delivery and employs DLL sideloading techniques.

UAT-11587 is a threat cluster attributed to a China-nexus actor targeting government and policy organizations across Taiwan, India, Philippines, Cambodia, Pakistan, Thailand, Myanmar, and Syria. The attackers use sophisticated spear-phishing with tailored political and diplomatic themes to deliver Antino, a previously undocumented backdoor compiled in Rust. Antino uses Microsoft 365 services (Outlook and OneDrive) as dead-drop command-and-control channels, avoiding traditional C2 infrastructure. The malware supports multiple capabilities including reconnaissance, command execution, file transfer, shellcode loading, and persistence. The infection chain uses Cloudflare infrastructure and DLL sideloading to evade detection. Attribution is supported by metadata artifacts such as Simplified Chinese language usage, UTC+8 timestamps, and China-focused Rust package mirrors.

Detailed information about China-nexus UAT-11587 targets government and policy organizations across Asia with Antino backdoor. Get real-time updates, technical 

China-nexus UAT-11587 targets government and policy organizations across Asia with Antino backdoor - Live Threat Intelligence - Threat Radar | OffSeq.com

China-nexus UAT-11587 targets government and policy organizations across Asia with Antino backdoor

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