Was DESY hit by ransomware?

DESY was listed by the Everest ransomware operation (Germany), 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 Everest ransomware group?

Everest 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 DESY breach?

Everest published data attributed to DESY. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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DESY

Claimed by Everest · listed 6 months ago

Age

since listed · data leaked

Status timeline

ListedJan 5, 2026
Data leakeddate unknown

At a glance

Group: Everest
Status: Data leaked
Country: Germany
Listed on leak site: Jan 5, 2026

About the victim

AI dossier — public-source company profile

DESY (Deutsches Elektronen-Synchrotron) is a German national research centre headquartered in Hamburg, with a second campus in Zeuthen, Brandenburg. It operates some of the world's most powerful particle accelerators and conducts research in photon science, particle physics, and accelerator development. DESY is funded largely by the German Federal Ministry of Education and Research and is a member of the Helmholtz Association.

Industry: Particle Physics & Accelerator Research
Address: Notkestraße 85, 22607 Hamburg, Germany
Employees: 2500-3000
Founded: 1959

Attack summary

Severity: high — DESY is a major government-funded national research institution involved in sensitive particle-physics and photon-science programmes with international collaborators; a confirmed data-published status implies exfiltration of potentially sensitive scientific, personnel, and operational data, warranting a high severity even without granular data inventory details.

The Everest ransomware group claims a disclosed/published-data incident against DESY; the leak post is minimal and does not specify whether encryption, exfiltration, or both occurred, nor does it detail the volume or nature of data involved.

high

Data the group says was taken

AI dossier — extracted from the leak post

Unspecified research or operational data

Original description

AI-summarised, not from the leak post

DESY, short for Deutsches Elektronen-Synchrotron, is a German research center funded by the Federal Republic of Germany, the states of Germany, and the German Research Foundation. Established in 1959 and based in Hamburg, it operates particle accelerators that are used to investigate the structure and function of matter. The center undertakes research in the fields of physics, photon science, nanotechnology, and much more.

The leak post

captured from the group's site

© 2026, All rights reserved
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Sources

Leak posthttp://ransomocmou6mnbquqz44ewosbkjk3o5qjsl3orawojexfook2j7esad.onion/news/DESY/

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.

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Disclosure context

About Everest

Everest is a financially-motivated ransomware group that emerged in September 2021, operating with a focus on profit-driven extortion campaigns against organizations primarily in the United States and Europe. The group's country of origin and specific affiliations remain undocumented in public threat intelligence reporting, though their operational patterns suggest they likely operate as an independent entity rather than a formal ransomware-as-a-service model. Limited public documentation exists regarding Everest's specific attack methodologies, initial access vectors, or technical capabilities, though their victim profile indicates they employ standard ransomware tactics targeting a diverse range of sectors including healthcare, technology, business services, and manufacturing organizations. Since their emergence, Everest has claimed responsibility for attacks against 339 victims across multiple countries, with the United States, United Kingdom, Italy, Germany, and Spain representing their primary geographic targets, though no specific high-profile incidents or major ransoms have been publicly documented by law enforcement or major security firms. As of current reporting, Everest appears to remain an active threat actor, though the limited public intelligence available suggests they operate as a lower-tier ransomware group compared to more prominent and well-documented criminal organizations. The group has been linked to 369 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post May 29, 2026. The operation is currently active.

Timeline of this disclosure

January 5, 2026DESY listed by Evereston the group's public leak site

Other recent disclosures by Everest

Everest has been linked to 369 public victims on Darkfield. A sample of the most recent:

See the full Everest dossier →

Sector and geography

Geographically, DESY is reported in Germany, a country with 926 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Everest means DESY 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, CERT-Bund (Germany), as required for your jurisdiction.
Monitor for the data appearing on Everest'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.