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Bronze Snowdrop is a China-based cyber espionage threat group assessed to operate with likely state tasking. Google tracks the group as UNC5174. The actor has targeted research and education institutions in Southeast Asia and the United States, businesses in Hong Kong, charities and non-governmental organizations, and government organizations in the United States and the United Kingdom. The group is notable for scanning for and exploiting vulnerabilities in internet-facing network edge infrastructure, particularly F5 and ConnectWise systems, to gain initial access. It has used SNOWLIGHT, a C-based downloader for Linux, alongside widely available offensive tooling including SuperShell, Metasploit, Sliver, and sqlmap. Its tradecraft indicates a focus on intrusion operations supporting intelligence collection, with emphasis on exploiting exposed services, establishing footholds on compromised systems, and conducting follow-on post-compromise activity using both custom malware and commodity red-team frameworks.
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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.
Attributed origin per open-source reporting.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Listed as a threat actor associated in the report’s aggregated section with exploitation activity around React2Shell (CVE-2025-55182) and related RSC/Next.js vulnerabilities.
Named in an aggregated list of actors associated with React2Shell (CVE-2025-55182) exploitation activity.
Espionage operations targeting research, education, government, and NGO sectors in Southeast Asia, the US, UK, and Hong Kong. The group is skilled at exploiting vulnerabilities in network edge devices and uses a mix of custom and common red team tools.
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.