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Leak-site post naming United Medical Doctors, captured by ThreatCluster
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United Medical Doctors

insomnia

Ransomware leak-site victim intelligence · EN

Posted
Apr 9, 2026
Country
United States
Industry
Hospitals & Physicians Clinics

Summary

Written by ThreatClusterfrom site fields, victim profile, leak post, screenshot

The insomnia group claims to have stolen data from United Medical Doctors (UMD); the amount is not disclosed. The leak page describes UMD as a US-based multi-location medical-surgical group with 70+ Southern California locations and 40+ specialties; location listed is Murrieta, California, and UMD was notified on 2026-03-31. The leak post was published on 2026-03-31.

Describes what the group claims on its leak site. A listing is not confirmation that a breach occurred.

Victim profile

Headquarters
Murrieta, California, United States
Employees
0
Domains
www.unitedmd.com

What was taken

United Medical Doctors (UMD) is an independent multi‑specialty medical‑surgical group with 70+ Southern California locations and 40+ specialties. They focus on high‑quality, compassionate care, patient satisfaction, process improvement, outpatient surgery, clinical research.

Also stated on the leak page

Fields this group publishes that do not map to a standard column. Labels are the site's own.

Location
Murrieta, California, USA
Notified
2026-3-31
Download Data URL
http://r3keoxye5mki4fqcvlk4hpfqqzxmakchjpmem7oppynobcieamdbmcyd.onion/01f29765832f8496/

Leak-site images (7)

Images from the victim's leak listing. Thumbnails scraped from the onion page are blurred by default — click a thumbnail to view.

ThreatCluster capture
Logo featuring the text "UNITED MEDICAL DOCTORS" with a stylized letter "U" in blue and orange.
onion leak page6.4 KB
Document containing a Confidential Disclosure Agreement for an above-sponsored clinical study, with sections outlining terms, obligations, and signatures.
onion leak page325 KB
The image contains a medical document with patient information, including personal details, medical history, and physician information, formatted across two pages.
onion leak page462 KB
Letter from Sanofi US Services Inc. regarding a clinical trial for Crohn's disease and ulcerative colitis, addressed to a doctor.
onion leak page285 KB
Screenshot of an email containing a message with attachments and links related to a research study on genetic variants and peripheral neuropathies.
onion leak page47 KB
Screenshot of an email containing instructions and requirements for submitting regulatory documents, with sections highlighted for clarity.
onion leak page57 KB

Negotiation
Onion http://r3keoxye5mki4fqcvlk4hpfqqzxmakchjpmem7oppynobcieamdbmcyd.onion/01f29765832f8496/