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Stuckin2019, also known as Stuck, is an apparently individual financially motivated extortion actor associated with claims of data theft from U.S. telehealth organizations. The actor has claimed responsibility for intrusions affecting OpenLoop Health, Zealthy, and Blossom Health. OpenLoop Health confirmed that an unauthorized party accessed its systems in January 2026 and exfiltrated data affecting 716,000 individuals; Stuckin2019 publicly claimed responsibility and asserted a larger number of affected records. The actor has advertised allegedly stolen patient information, sought payment in exchange for non-disclosure or deletion of data, and threatened public release of data. Reported victim data includes personally identifiable information, medical information, and other protected health information. The actor's country of origin, technical tooling, and specific intrusion methods have not been independently 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.
8 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 indicator attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Conducting data-extortion attacks against telehealth services, including alleged theft of patient and company data from Blossom Health and a Bitcoin ransom demand.
Claimed responsibility for the OpenLoop Health breach and alleged theft of patient data.
Claimed responsibility for the OpenLoop Health attack and alleged large-scale exfiltration of patient records from the telehealth platform provider.
Claimed responsibility for the OpenLoop Health breach, allegedly exfiltrated patient data, published sample records as proof of theft, and is described as an individual who has reportedly targeted telehealth companies.
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.