UNC5673
UNC5673 is a PRC-nexus threat cluster. Google reported that it targets government sectors in South and Southeast Asia and has used AI systems for exploit development and vulnerability research. Reported activity includes integrating the wooyun-legacy archive, a Chinese vulnerability dataset containing more than 85,000 cases, as a Claude code skill plugin to bias model reasoning toward real-world bug patterns. UNC5673 was also reported to operate middleware and account-pooling infrastructure, including Claude-Relay-Service and CLI-Proxy-API, to aggregate multiple Gemini, Claude, and OpenAI accounts behind a single OpenAI-compatible endpoint. No additional aliases or sub-groups were directly identified in the provided content beyond the UNC5673 designation.
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Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
Targeting
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Who they target
Sectors the actor has been observed targeting.
- Government & Administration
Where they're from
Attributed origin per open-source reporting.
- CN
Tradecraft
2 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
PRC-linked cluster targeting government sectors in South and Southeast Asia and augmenting AI-assisted vulnerability research with the wooyun-legacy dataset via a Claude plugin.
Targets government sectors in South and Southeast Asia and uses a large Chinese vulnerability dataset as a Claude plugin to improve AI-assisted vulnerability reasoning.
Using AI systems for exploit development and vulnerability research.
Built middleware to aggregate and pool multiple AI service accounts, likely to bypass guardrails and billing constraints at scale.
The version that knows your environment.
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.