Loading threat actor…
NetRunner is a cyber extortion threat actor associated with data exfiltration–driven operations against enterprise environments, particularly organizations holding large volumes of sensitive information. Reported 2026 activity links the group to targeting healthcare-related organizations and service providers, with an emphasis on stealing data and using extortion pressure rather than relying solely on file encryption. The actor has been associated with a major ransom demand against Nippon Medical School Musashi Kosugi Hospital in Japan. Available reporting supports NetRunner as an extortion-focused actor active in the broader ransomware ecosystem, but does not provide high-confidence attribution to a nation-state or a clearly established country of origin.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
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.
1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
15 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Data extortion actor targeting healthcare-related organizations for sensitive data theft.
Ransomware group noted for a very large ransom demand against a Japanese hospital in Q1 2026.
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.