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Kazu is a financially motivated ransomware and data-extortion group that emerged in mid-2025. The group has used dedicated leak-site postings and criminal-forum advertisements to pressure alleged victims into paying ransoms, threatening to sell purportedly stolen data when demands are not met. Kazu initially showed activity against government and public-sector organizations, but has subsequently demonstrated a pronounced focus on healthcare and healthcare-technology targets, particularly telemedicine, patient-management, diagnostic-imaging, veterinary-care, and medical-service providers. Reported victim claims also include organizations in education technology and appointment-management services. Kazu has claimed theft of large volumes of sensitive personal, identity, immigration, financial, and health-related data. The group’s publicly reported victim assertions should be treated as unverified unless independently confirmed by the affected organization or authoritative disclosure. Kazu’s origin, membership, malware tooling, initial-access methods, and use of encryption in individual intrusions are not publicly established.
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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.