Chinese threat actor UAT-6382 exploited a patched Trimble Cityworks flaw to deploy Cobalt Strike and VShell.
The CVE-2025-0994 vulnerability in Trimble Cityworks allowed remote code execution, with a CVSS v4 score of 8.6.
UAT-6382 breached U.S. local government networks using this vulnerability since January 2025, deploying Chinese-language web shells and custom malware.
Talos researchers identified UAT-6382 utilizing Rust-based loaders named TetraLoader, connecting to specific domains and IPs for malicious activities.