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NetRunner is a financially motivated ransomware and data-extortion threat actor active in 2026. The group has targeted enterprise environments with large data stores, including healthcare-related organizations and service providers, emphasizing the theft of sensitive information for extortion. NetRunner was observed among ransomware groups affecting organizations in Japan and reportedly demanded US$100 million from Nippon Medical School Musashi Kosugi Hospital; the demand was not paid. The group was also attributed with a ransomware attack against Main Place Mall, a Malaysian retail and mixed-development organization. NetRunner is also known as netrunner.
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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.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Allegedly conducted a ransomware attack against Main Place Mall in Malaysia.
NetRunner was listed among other ransomware groups observed in Japan during the first half of 2026.
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.