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 360 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post May 7, 2026. The operation is currently active.

Timeline of this disclosure

February 1, 2026Stellium listed by Evereston the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Stellium is reported in United Kingdom, a country with 902 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

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Stellium

Claimed by Everest · listed 4 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 1, 2026
Data leaked

At a glance

Group: Everest
Status: Data leaked
Country: United Kingdom
Sector: Not Found
Listed on leak site: Feb 1, 2026

About the victim

AI dossier — public-source company profile

Stellium is a data centre operator based in Newcastle upon Tyne, United Kingdom, providing colocation, connectivity, and managed IT infrastructure services. The company operates carrier-neutral facilities serving enterprise and public-sector clients across the UK. No additional verifiable detail is available from the leak post or a public site excerpt.

Industry: Data Centre & Colocation Services

Attack summary

Severity: high — The disclosed status is 'data_published', meaning Everest claims to have already released exfiltrated data publicly. A data centre operator holds sensitive infrastructure, connectivity, and potentially regulated client data, making any confirmed exfiltration significant even without explicit inventory details.

The Everest ransomware group has listed Stellium under a 'data_published' status, indicating the group claims to have exfiltrated data and subsequently published it. The leak post provides no further specifics on the volume or nature of data exposed.

high

Original description

AI-summarised, not from the leak post

Stellium is a consulting firm focused on services for supply chain management optimization, such as data analytics, lean manufacturing strategies, and innovative technology implementation. They cater to multiple industries, including energy, manufacturing, technology, and healthcare, among others. Their methods revolve around the utilization of advanced data to optimize operations and produce successful business outcomes.

The leak post

captured from the group's site

© 2026, All rights reserved
Citizens Bank - Database Leaked 
Evaluate a Norstella company - Database Leaked 
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Super AI - Database Leaked 
Complete Aircraft Group - Database Leaked 
Umiles Group - Database Leaked 
K Subsea Group - Database Leaked 
Parque Eólico Toabré - Database Leaked 
PT Brantas Abipraya - Database Leaked 
Straight Line Logistics - Database Leaked 
First Priority Group - Database Leaked 
Hyundai Elevator - Database Leaked 
UD Trucks - Database Leaked 
McDonalds India - Database Leaked 
Tsunami Tsolutions - Database Leaked 
Atlas Air: MUSE INSECURE - Database Leaked 
Iron Mountain - Database Leaked 
Hosowaka Micron Group - Database Leaked 
Shinwa Co Ltd - Database Leaked 
SIGMA Processing Group - Database Leaked 
Acu Trans Solutions LLC - Database Leaked 
GIBSIN Engineers - Database Leaked 
ASRock Rack - Database Leaked 
Reeves Information Technology - Database Leaked 
WANCHI STEEL INDUSTRIAL - Database Leaked 
GC Accounting - Database Leaked 
National Money Mart Company - Database leaked 
Virginia Records - Database Leaked 
Morgan Records Management - Database leaked 
ELC Electroconsult SpA - Databas…

Sources

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

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.