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Kazu is a financially motivated ransomware and data-extortion group that emerged in mid-2025. Also tracked as kazu, the group initially focused on government and public-sector entities, then demonstrated a pronounced focus on healthcare and healthcare-technology organizations, particularly telemedicine, patient-management, diagnostic-imaging, and veterinary-care platforms in Latin America. Reported and claimed victims also include organizations in education technology, cultural exchange, and appointment-management services. Kazu has been linked to ransomware incidents and to extortion operations in which it claims to have exfiltrated large datasets, demands payment by a deadline, and threatens public sale of the data if victims do not comply. Claimed datasets have included personal, identity, education, immigration, financial, and health-related information. Several individual intrusion, exfiltration, and victim claims remain unverified; the group has not publicly disclosed reliable technical details of its access methods or malware tooling.
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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.
13 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Claimed extortion of MSM Unify over an alleged 1.45 TB theft containing international student applicants' identity, passport, visa, academic, and payment documents. The claim is explicitly unverified; no samples, intrusion method, or confirmed compromise evidence are provided.
Claimed ransomware attack against MSM Unify, a global education technology platform.
Conducted a ransomware attack against Spirit Cultural Exchange, a U.S.-based provider of international cultural-exchange and J-1 visa programs.
Recorded seven ransomware claims and newly appeared in the weekly top-ten activity ranking.
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.