Was Medstar Health hit by ransomware?

Medstar Health was listed by the Rhysida ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Rhysida ransomware group?

Rhysida is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Medstar Health breach?

Rhysida published data attributed to Medstar Health (~10 TB), around 287 files records. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

STELIA North America

listed as Medstar Health · Claimed by Rhysida · listed 9 months ago

10 TB

Data size

287 files records

Age

since listed · data leaked

Status timeline

ListedOct 4, 2025
Data leakeddate unknown

At a glance

Group: Rhysida
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Oct 4, 2025
Data size: 10 TB
Records: 287 files

About the victim

AI dossier — public-source company profile

STELIA North America is an aerospace and defence company specializing in the design, development, and manufacturing of composite structures and components. The company works with major defence and aerospace partners including Lockheed Martin, Northrop Grumman, Sikorsky, Boeing, Airbus Atlantic, and Bombardier, among others. It operates in North America and supplies to globally significant defence and commercial aviation programs.

Industry: Aerospace & Defence Manufacturing (Composites)

Attack summary

Severity: critical — 10 TB of confirmed exfiltrated and publicly released data from an aerospace and defence manufacturer with documented ties to major US and allied defence primes (Lockheed Martin, Northrop Grumman, Sikorsky, Boeing, L3Harris); exposure of defence supply-chain and proprietary engineering data constitutes a critical national-security-level disclosure.

Rhysida claims to have exfiltrated 10 TB of confidential data from STELIA North America, including data from major partner companies such as Lockheed Martin, Northrop Grumman, Sikorsky, and Boeing; the group states all files have been uploaded to public access.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Confidential business data
Partner/customer data (Lockheed Martin, Northrop Grumman, Sikorsky, Leonardo, L3Harris, Airbus Atlantic, Boeing, Bombardier, De Havilland, ARDE, MDA)
Design and engineering documents (inferred)
Manufacturing data (inferred)

What the group claims

Medstar Health

The leak post

captured from the group's site

STELIA North America is an aerospace and defence company specializing in the design, development, and manufacturing of composites.10 TB of confidential data!Data from major partner companies, such as: Lockheed Martin, Northrop Grumman, Sikorsky, Leonardo, L3Harris, Airbus Atlantic, Boeing, Bombardier, De Havilland, ARDE, MDA.
Data Catalog: 9,3 Tb, 4 324 287 Files 
All files was uploaded to public access, data hunters, enjoy 
[Southold Town Senior ServicesSouthold Police Department](https://www.southoldtownny.gov)
The Town of Southold, New York provides various government services including forms and permits, online payments, and notifications for residents. Southold Police Department is a company that operates in the Local industry.
Data Catalog: 1,7 Tb, 767 693 Files 
All files was uploaded to public access, data hunters, enjoy 
Rohner designs and builds high-quality, custom paint booths and manufactured industrial paint systems. Our quality and service, cutting-edge technology, and engineering experience provide the best value in the finishing equipment industry.
Data Catalog: 3 Tb, 3 924 397 Files 
All files was uploaded to public access, data hunters, enjoy 
The Cheyenne and Ar…

Source

Indexed 9 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Rhysida

Rhysida is a ransomware group that emerged in June 2023, operating with primarily financial motivations through targeted attacks against critical infrastructure and public sector organizations. The group's origin and potential state affiliations remain unclear, though they operate independently rather than as a traditional Ransomware-as-a-Service model, with limited public documentation regarding connections to other cybercriminal organizations. Rhysida employs double extortion tactics, typically gaining initial access through compromised VPN credentials and exploiting vulnerable public-facing applications before deploying their ransomware payload and exfiltrating sensitive data prior to encryption. The group has demonstrated a particular focus on healthcare and educational institutions, with notable attacks documented by CISA and FBI advisories highlighting their targeting of hospitals and school districts across multiple countries, resulting in significant operational disruptions to critical services. As of late 2024, Rhysida remains an active threat with continued operations targeting organizations primarily in the United States, Canada, and other Western nations, maintaining their focus on high-value sectors where operational disruption can maximize ransom payment likelihood. The group has been linked to 282 public disclosures across our corpus. First observed on a leak site on June 5, 2023; most recent post June 18, 2026. The operation is currently active.

Timeline of this disclosure

October 4, 2025Medstar Health listed by Rhysidaon the group's public leak site

Data size: 10 TB
Records: 287 files

Other recent disclosures by Rhysida

Rhysida has been linked to 282 public victims on Darkfield. A sample of the most recent:

See the full Rhysida dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,600 disclosures indexed across all operators we track. Geographically, Medstar Health is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Rhysida means Medstar Health appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Rhysida's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.