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 278 public disclosures across our corpus. First observed on a leak site on June 5, 2023; most recent post May 20, 2026. The operation is currently active.

Timeline of this disclosure

February 4, 2026Lakeside Union School District listed by Rhysidaon the group's public leak site

Data size: 10 TB
Records: 287 files

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, Lakeside Union School District is reported in United States, a country with 7,392 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

Lakeside Union School District

Claimed by Rhysida · listed 4 months ago

10 TB

Data size

287 files records

Age

since listed · data leaked

Status timeline

Listed
Feb 4, 2026
Data leaked

At a glance

Group: Rhysida
Status: Data leaked
Country: United States
Sector: Education
Listed on leak site: Feb 4, 2026
Data size: 10 TB
Records: 287 files

About the victim

AI dossier — public-source company profile

Lakeside Union School District is a public school district in California serving preschool through 8th-grade students. The district focuses on providing a safe, nurturing environment that promotes academic success, personal growth, and responsible citizenship.

Industry: K-8 Public Education

Attack summary

Severity: high — 585 GB / 1.67 million files have been fully published publicly from a K-8 school district, which likely contains PII of minors (students) and staff; exfiltration of minor PII at scale from an educational institution is a serious regulated-data exposure even if not explicitly confirmed as medical or financial records.

Rhysida claims to have exfiltrated 585 GB of data comprising 1,670,126 files from Lakeside Union School District and has published all files to public access.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student records
Staff records
Administrative files
District operational documents

What the group claims

Lakeside Union School District

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 4 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.