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UNC4191 is a China-nexus cyberespionage activity cluster active since at least September 2021. Its operations have primarily affected public- and private-sector entities in the Philippines and Southeast Asia, with affected organizations also reported in the United States, Europe, and the Asia-Pacific region. Even where victim organizations were headquartered outside the Philippines, targeted systems were physically located there. UNC4191 uses malicious removable USB media for initial access, requiring physical access or use of the device by an unwitting individual. The group employs legitimately signed executables to DLL-side-load the MISTCLOAK, DARKDEW, and BLUEHAZE malware families, which provide reverse-shell backdoor access. These implants propagate by infecting newly attached removable drives, allowing worm-like spread including into air-gapped environments. The activity is assessed to support intelligence collection aligned with Chinese political and commercial interests. UNC4191 has not been formally attributed to a specific state-sponsored group.
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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.
4 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
3 malware families attributed to this actor across reporting.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
UNC4191 is a China-nexus intrusion set focused on cyberespionage against government and strategic entities in Southeast Asia, Europe, and the US.
Cyber espionage campaign using malicious USB devices for initial access, followed by side-loading malware via legitimately signed binaries to establish backdoor access and spread through removable drives, including to air-gapped 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.