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UNC3658 is a suspected Chinese cyber espionage activity cluster tracked for exploiting the Microsoft Follina vulnerability (CVE-2022-30190) as a zero-day in 2022. The cluster was observed from March to May 2022 in operations likely targeting the Philippine government. Its known activity aligns with broader Chinese state-linked tradecraft involving exploitation of newly disclosed or previously unknown vulnerabilities for initial access against public-sector organizations. UNC3658 is one of several distinct clusters observed using Follina during the same period, consistent with assessments that multiple Chinese espionage teams may have had access to shared exploit logistics or a centralized support function. High-confidence reporting supports UNC3658’s role in zero-day-enabled intrusion activity and likely government targeting, but publicly available detail on its malware, persistence mechanisms, post-compromise actions, and any broader victimology remains limited.
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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.
1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.