Disclosure context

About Nokoyawa

Nokoyawa is a ransomware group that emerged in December 2022, operating with primarily financial motivations and targeting organizations across multiple sectors including healthcare, non-profit, education, finance, and energy. The group has claimed at least 36 victims since its emergence, with attacks predominantly focused on the United States, Canada, United Kingdom, France, and the Philippines. While detailed technical analysis of Nokoyawa's operations remains limited in public reporting, the group appears to follow conventional ransomware tactics targeting critical infrastructure and essential services sectors. Their targeting of healthcare and educational institutions suggests they operate without the sector restrictions that some other ransomware groups have adopted. Notable campaigns include attacks across their preferred geographic regions, though specific high-profile incidents have not been extensively documented in public threat intelligence reporting from major security firms. As of current reporting, Nokoyawa appears to remain an active threat, though the group's relatively recent emergence means long-term operational patterns and potential law enforcement disruption efforts are still developing. The group has been linked to 36 public disclosures across our corpus. First observed on a leak site on December 9, 2022; most recent post October 8, 2023. The operation is currently inactive.

Timeline of this disclosure

May 23, 2023Sabin listed by Nokoyawaon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Sabin is reported in Brazil, a country with 319 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Sabin Medicina Diagnóstica

listed as Sabin · Claimed by Nokoyawa · listed 3 years ago

36m

Age

since listed · data leaked

Status timeline

Listed
May 23, 2023
Data leaked

At a glance

Group: Nokoyawa
Status: Data leaked
Country: Brazil
Sector: Healthcare
Listed on leak site: May 23, 2023

About the victim

AI dossier — public-source company profile

Sabin Medicina Diagnóstica is one of Brazil's leading medical diagnostics companies, offering a wide range of high-precision laboratory tests and diagnostic services. The company is headquartered in Brasília, Brazil, and operates an extensive network of collection units across multiple Brazilian states. Sabin is widely recognized for its organizational culture and quality of customer service in the healthcare sector.

Industry: Medical Diagnostics & Laboratory Services
Employees: 1001-5000
Founded: 1999

Attack summary

Severity: critical — Sabin is a large-scale medical diagnostics provider; a data_published status strongly implies confirmed exfiltration of regulated health and PII data at scale, including patient medical records and diagnostic results, which constitutes sensitive regulated data under Brazilian LGPD and healthcare privacy standards.

Nokoyawa claims to have compromised Sabin Laboratory and has reached the data_published stage, indicating exfiltration and publication of stolen data. The specific data categories and volume have not been explicitly quantified in the post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient records
Laboratory test results
Personal identification information
Employee data
Business/organizational documents

What the group claims

Sabin Laboratory is one of the leading medical diagnostics companies in Brazil. The company is well-known for its premium customer relationship and high-precision and wide-range lab tests. Sabin's robust and healthy organizational culture has been vastly awarded in Brazil and across...

Sources

Victim sitesabin.com.br/
Leak posthttp://nokoleakb76znymx443veg4n6fytx6spck6pc7nkr4dvfuygpub6jsid.onion/leak/6441c7a7f675292f2b84f1f1

Source

Indexed 3 years 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.