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UAT-6382 is a Chinese-speaking intrusion cluster associated with exploitation of CVE-2025-0994 in Trimble Cityworks beginning in January 2025. The activity has been observed against enterprise networks of local governing bodies in the United States, with indications of follow-on interest in systems related to utilities management. The actor’s operations are consistent with a China-aligned post-compromise tradecraft set focused on establishing access, conducting reconnaissance, maintaining persistence, and enabling further exploitation. Following exploitation of the Cityworks vulnerability, UAT-6382 rapidly deployed multiple IIS web shells and file-upload utilities, including AntSword, Chopper, and Behinder, to secure persistent access and facilitate hands-on-keyboard operations. The actor conducted host and directory reconnaissance, enumerated web application and server paths, and staged backup archives in web-accessible locations for likely exfiltration. Additional tooling included TetraLoader, a Rust-based loader built with the Chinese-language MaLoader framework, which was used to decode embedded payloads and inject them into benign processes. UAT-6382 deployed both Cobalt Strike and VShell during post-exploitation. VShell, delivered via the SNOWLIGHT stager, provided remote access capabilities including file management, arbitrary command execution, screenshot capture, and proxying. The actor’s observed tradecraft includes process injection, persistence through web shells and implants, reconnaissance, post-exploitation tooling deployment, and data staging consistent with exfiltration objectives. Tooling overlap links UAT-6382 to other Chinese-speaking or China-nexus clusters that have used SNOWLIGHT and VShell, including UNC5174, UNC6586, and UAT-8302, but UAT-6382 remains a distinct tracked activity cluster.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
12 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
8 malware families attributed to this actor across reporting.
3 additional families tracked in Mallory.
2 CVEs this actor has used in observed campaigns. 2 of them exploited in the wild.
Talos has found intrusions in enterprise networks of local governing bodies in the United States (U.S.), beginning January 2025 when initial exploitation first took place. UAT-6382 successfully exploited CVE-2025-0944, conducted reconnaissance and rapidly deployed a variety of web shells and custom-made malware to maintain long-term access.
Cisco Talos has observed exploitation of CVE-2025-0994, a remote-code-execution vulnerability in Cityworks, a popular asset management system. The Cybersecurity and Infrastructure Security Agency (CISA) and Trimble have both released advisories pertaining to this vulnerability...
19 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Threat cluster associated with use of the SNOWLIGHT VShell stager.
Threat cluster observed exploiting a Cityworks zero-day to deploy VSHELL using the SNOWLIGHT stager.
Chinese-speaking intrusion cluster exploiting Trimble Cityworks CVE-2025-0944 to deploy web shells/custom malware and post-exploitation tooling (Cobalt Strike, VShell) for long-term access.
Exploitation of Cityworks to compromise U.S. local government enterprise networks, followed by rapid web shell deployment, reconnaissance, persistence, and pivoting toward utilities-related systems.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.