NetRunner
NetRunner is a threat actor associated with data exfiltration and extortion operations, including activity against healthcare-related organizations and service providers in 2026. The available reporting describes NetRunner as focusing on extracting sensitive data for extortion rather than relying solely on encryption, and as often targeting enterprise environments with large data stores. In Q1 2026, NetRunner was reported to have made the largest reported healthcare ransom demand in the dataset: $100 million against Nippon Medical School Musashi Kosugi Hospital in Japan; the ransom was not paid. The content links NetRunner to healthcare-sector targeting and extortion activity, but does not provide high-confidence attribution to any nation-state, malware family, or additional sub-groups. Known alias in the provided content: netrunner.
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Targeting
Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Who they target
Sectors the actor has been observed targeting.
- Health Care Equipment & Services
Where they target
Geographies tied to known operations.
- 🇯🇵 Japan
Tradecraft
1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
Observables
15 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
Recent activity
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.
The version that knows your environment.
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.