Was Sanderling hit by ransomware?

Sanderling was listed by the Sarcoma 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 Sarcoma ransomware group?

Sarcoma 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 Sanderling breach?

Sarcoma published data attributed to Sanderling. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sanderling Renal Services

listed as Sanderling · Claimed by Sarcoma · listed 1 year ago

$200.000

Ransom

demanded

12m

Age

since listed · data leaked

Status timeline

ListedJul 3, 2025
Data leakeddate unknown

At a glance

Group: Sarcoma
Status: Data leaked
Country: United States
Listed on leak site: Jul 3, 2025
Ransom demanded: $200.000

About the victim

AI dossier — public-source company profile

Sanderling Renal Services is a US-based healthcare provider specializing in dialysis and nephrology care, with a focus on rural communities and home dialysis patients. The company operates a national network of licensed physicians and has been in operation for over 25 years.

Industry: Healthcare Services – Dialysis & Nephrology

Attack summary

Severity: critical — Confirmed exfiltration of large-scale regulated healthcare data including complete PHI (patient names, addresses, phone numbers, SSNs, medical records) covering potentially tens of thousands of patients across 25 years. This is Protected Health Information (PHI) under HIPAA, representing one of the highest categories of sensitive personal data.

The Sarcoma group claims to have exfiltrated a complete Oracle database backup containing 25 years of company operations and patient records, along with Exchange email backups and company files including identification documents. The group is threatening to publish the data unless a $200,000 ransom is paid.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Oracle database backup (25 years of operational data)
Patient personal health information (PHI)
Patient full names, phone numbers, emails, addresses
Social Security numbers (SSNs)
Exchange email backups (PST files)
Passports
Driver licenses

What the group claims

Price: $200,000 Sanderling Renal Services is a leading healthcare company that specializes in providing high-quality dialysis and nephrology services to rural communities and home dialysis patients across the USA. The company leverages advanced telemedicine technology and over 25 years of experience to bring specialized kidney care to underserved areas through its national network of licensed physicians. Dataset contains: tens/hundreds of thousands of personal records | Unsold data will be published. Purchased lots will be permanently removed from the final archive. Exclusive data — what we sell cannot be found elsewhere. Archive contains: - Full Oracle base backup (Contains informations of 25 years of work of this company, patients full info, full PHI, phones, emails, addresess, ssn's and etc) - Exchange backup (Backup of pst files) - Company Files (Passports, Driver Licences and etc)Geo: USA - Leak size: GB - Contains: N/A

Source

Indexed 1 year 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 Sarcoma

Sarcoma is a relatively new ransomware group that emerged in October 2024, operating with apparent financial motivations and demonstrating a broad international targeting approach with at least 140 documented victims across multiple countries and industry sectors. The group's origin and affiliations remain unclear due to its recent emergence, with no publicly documented connections to established ransomware families or confirmation of whether they operate as an independent entity or through a Ransomware-as-a-Service model. Limited public information is available regarding Sarcoma's specific attack methodologies, initial access vectors, or technical capabilities, though their targeting patterns suggest opportunistic rather than highly selective victim selection across diverse industries including manufacturing, business services, agriculture and food production, and technology sectors. The group has shown a particular focus on victims in the United States while also maintaining operations against targets in Italy, Canada, Germany, and Australia, though no specific high-profile attacks or record ransom demands have been publicly documented by major security firms or law enforcement agencies. Given the group's recent emergence in late 2024, Sarcoma appears to remain active with no reported law enforcement disruptions or confirmed rebranding activities at this time. The group has been linked to 150 public disclosures across our corpus. First observed on a leak site on October 9, 2024; most recent post May 12, 2026. The operation is currently active.

Also tracked as: Sarcoma Ransomware Group.

Timeline of this disclosure

July 3, 2025Sanderling listed by Sarcomaon the group's public leak site

Ransom demanded: $200.000

Other recent disclosures by Sarcoma

Sarcoma has been linked to 150 public victims on Darkfield. A sample of the most recent:

See the full Sarcoma dossier →

Sector and geography

Geographically, Sanderling is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Sarcoma means Sanderling 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 Sarcoma'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.