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 17, 2026Atlas Air: MUSE INSECURE listed by Evereston the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 847 disclosures indexed across all operators we track. Geographically, Atlas Air: MUSE INSECURE 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

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Atlas Air

listed as Atlas Air: MUSE INSECURE · Claimed by Everest · listed 3 months ago

Age

since listed · data leaked

Status timeline

Listed
Feb 17, 2026
Data leaked

At a glance

Group: Everest
Status: Data leaked
Country: United States
Sector: Transportation/Logistics
Listed on leak site: Feb 17, 2026

About the victim

AI dossier — public-source company profile

Atlas Air is a U.S.-based cargo airline and aircraft leasing company founded in 1992 and headquartered in Purchase, New York. The company operates a large fleet of Boeing freighter aircraft, providing air cargo, charter, and ACMI (Aircraft, Crew, Maintenance, and Insurance) services to airlines, freight forwarders, and the U.S. military worldwide. Atlas Air is a subsidiary of Atlas Air Worldwide Holdings and is one of the largest air cargo carriers in the world.

Industry: Air Cargo & Charter Aviation
Employees: 1001-5000
Founded: 1992

Attack summary

Severity: high — Atlas Air is a major air cargo operator with ties to U.S. military logistics; a confirmed data publication by a ransomware group against such a critical transportation/logistics entity constitutes high severity, even without detailed proof count or data volume, due to the sensitivity of potential operational, employee, and government-contract data.

The Everest ransomware group claims to have compromised Atlas Air, listing the victim under the label 'MUSE INSECURE' with a disclosed/published status, suggesting data exfiltration has occurred or been published. The leak post itself is minimal and provides no explicit detail on the volume or nature of data claimed.

high

Data the group says was taken

AI dossier — extracted from the leak post

Internal business documents
Employee records
Operational data

Original description

AI-summarised, not from the leak post

N/A

The leak post

captured from the group's site

© 2026, All rights reserved
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Sources

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

Source

Indexed 3 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.