Was National Kidney Registry hit by ransomware?

National Kidney Registry was listed by the direwolf 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 direwolf ransomware group?

direwolf 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 National Kidney Registry breach?

direwolf published data attributed to National Kidney Registry. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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National Kidney Registry

Claimed by Direwolf · listed 27 minutes ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 25, 2026
Data leakeddate unknown

At a glance

Group: Direwolf
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Aug 25, 2026

Original description

AI-summarised, not from the leak post

The National Kidney Registry is a nonprofit organization based in the United States that facilitates kidney paired donation programs. It operates within the healthcare and organ transplantation industry, connecting kidney donors and recipients across a national network of transplant centers. Its mission is to improve transplant outcomes, increase the number of living donor transplants, and reduce patient waiting times for compatible kidneys.

The leak post

captured from the group's site

```
{"article":{"id":111,"title":"National Kidney Registry","content":"\u003ch3\u003e1. Overview\u003c/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eItem\u003c/th\u003e\n\u003cth\u003eValue\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBusiness\u003c/td\u003e\n\u003ctd\u003eUNOS‑affiliated transplant program: donor/recipient matching, paired exchange (PKE), advance donation (ADP), and financial reimbursement.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal records\u003c/td\u003e\n\u003ctd\u003e180,000 documents / files across 8 functional datasets\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitive data\u003c/td\u003e\n\u003ctd\u003eSSN, DOB, full medical history, imaging, HLA typing, financial proofs (pay stubs, tax forms, receipts), and personal contact details. All subject to HIPAA and UNOS data protection policies.\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGovernance\u003c/td\u003e\n\u003ctd\u003eRole‑based access, encryption at rest, audit logging, and de‑identification for research. Data retained per institutional and regulator…

Sources

Victim sitekidneyregistry.com
Leak posthttp://direwolfcdkv5whaz2spehizdg22jsuf5aeje4asmetpbt6ri4jnd4qd.onion/api/public/articles/111

Source

Indexed 27 minutes 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 direwolf

Direwolf is a ransomware group that emerged in May 2025 with primarily financial motivations, having targeted 71 known victims across multiple sectors and geographic regions. The group's origin and potential affiliations remain undocumented in public threat intelligence reports, with no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major cybersecurity firms or government agencies, though their targeting patterns indicate a focus on manufacturing, technology, healthcare, and transportation/logistics sectors across Malaysia, the United States, Thailand, Singapore, and Taiwan. No major high-profile campaigns or significant ransomware demands have been publicly attributed to this group by CISA, FBI, or established security researchers such as Mandiant. Given the group's recent emergence and limited public documentation, their current operational status and long-term threat posture remain unclear, requiring continued monitoring by the cybersecurity community to establish a more comprehensive threat profile. The group has been linked to 115 public disclosures across our corpus. First observed on a leak site on May 27, 2025; most recent post August 25, 2026. The operation is currently active.

Also tracked as: DIRE WOLF.

Timeline of this disclosure

August 25, 2026National Kidney Registry listed by direwolfon the group's public leak site

Other recent disclosures by direwolf

direwolf has been linked to 115 public victims on Darkfield. A sample of the most recent:

See the full direwolf dossier →

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 2,608 disclosures indexed across all operators we track. Geographically, National Kidney Registry is reported in United States, a country with 3,164 ransomware disclosures in our corpus.

If your organisation is affected

A listing by direwolf means National Kidney Registry 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 direwolf'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.