Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 568 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post February 14, 2026. The operation is currently active.

Also tracked as: MedusaLocker.

Timeline of this disclosure

November 30, 2025Concord Academy listed by Medusaon the group's public leak site

Records: 50 Employees

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, Concord Academy 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

Concord Academy

Claimed by Medusa · listed 6 months ago

50 Employees

Records

Age

since listed · data leaked

Status timeline

Listed
Nov 30, 2025
Data leaked

At a glance

Group: Medusa
Status: Data leaked
Country: United States
Sector: Education
Listed on leak site: Nov 30, 2025
Records: 50 Employees

About the victim

AI dossier — public-source company profile

Concord Academy is a private secondary school located in the United States. It offers college-preparatory education and is likely a small to mid-sized independent school serving a student body of several hundred pupils. No further details could be confirmed from the available sources.

Industry: Private K-12 Education
Employees: 51-200

Attack summary

Severity: high — Concord Academy is an educational institution likely holding regulated PII for minors (FERPA-protected student records), staff data, and financial information. The disclosed status is data_published, meaning data has been released, which elevates severity beyond medium even without confirmed volume details.

The Medusa ransomware group claims to have attacked Concord Academy and has listed the disclosure status as data_published, indicating exfiltration and/or publication of data. The specific nature of the stolen data could not be confirmed from the truncated leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Student records
Staff personnel files
Financial records
Academic documents

What the group claims

Concord Academy is a specialized educational institution that serves students with Autism, learning and intellectual disabilities, language processing disorders, ADD/ADHD, and other neurodiverse learning needs. The academy provides a unique learning community focused on respect and acceptance, operating within a small, structured, and secure environment. Their mission is to prepare these students for lifelong success, offering tailored educational programs and support. A significant percentage of graduates advance to post-secondary placements, reflecting the effectiveness of their individualized approach. company is headquartered in 4942 Walnut Grove Road, Memphis, TN 38117, USA. 11-50 Employees

The leak post

captured from the group's site

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Sources

Leak posthttp://xfv4jzckytb4g3ckwemcny3ihv4i5p4lqzdpi624cxisu35my5fwi5qd.onion/detail?id=316877ccd6312bfe574f659bc5fb1771

Source

Indexed 6 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.