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Everest is a Russia-linked ransomware operation active since at least 2020 that has operated as a ransomware-as-a-service and double-extortion enterprise. The group is known for stealing data, encrypting victim systems, and threatening public release of stolen information to coerce payment. Reporting has also associated Everest with initial access brokerage activity, indicating that the operation has at times monetized network footholds in addition to ransomware deployment.
Everest has targeted organizations across North America, Europe, and Asia, with victims spanning government, healthcare, telecommunications, aviation, manufacturing, energy, finance, and other enterprise sectors. Publicly claimed victims and incident reporting indicate broad opportunistic targeting rather than a narrow vertical focus, although healthcare and critical business operations have featured prominently in observed cases.
Initial access has been associated with exploitation of vulnerable public-facing applications, phishing, and the use of stolen credentials. In intrusions attributed to Everest, data theft may occur earlier in the attack chain through tooling separate from the ransomware payload itself. This distinction is important because technical analysis of at least one live Everest encryptor sample found no built-in exfiltration capability despite extortion claims of large-scale data theft.
The Everest encryptor has been observed as a .NET executable protected with ConfuserEx and designed primarily for defense evasion, process disruption, network reachability, and file encryption. Observed behaviors include mutex-based single-instance execution, geofencing to avoid systems configured with Commonwealth of Independent States language or locale settings, termination of security and analysis tools, disabling of Windows Defender Controlled Folder Access, deletion of shadow copies, removal of backup-related data, and removal of the anti-ransomware tool Raccine. The malware has also demonstrated an unusual use of Wake-on-LAN broadcasts to wake sleeping devices so they can be encrypted.
For encryption, Everest has been observed using AES-128 for file data and RSA-1024 to protect encryption keys. It encrypts smaller files fully and larger files partially to accelerate impact across large environments. After encryption it appends a dedicated Everest extension to affected files, drops ransom notes in impacted locations, and can self-delete after execution.
Everest is best understood as an extortion-focused criminal operation whose public claims may at times overstate the capabilities of the ransomware binary itself. Its operational model combines conventional ransomware deployment with data-theft pressure and public leak-site coercion, making it a persistent threat to enterprise environments and third-party supply chains.
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2 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
"This latest blog documents the TTPs employed by a group who were observed deploying Everest ransomware during a recent incident response engagement."
"This latest blog documents the TTPs employed by a group who were observed deploying Everest ransomware during a recent incident response engagement."
21 distinct techniques documented for this family, organized by ATT&CK tactic.
Its usual playbook involves exploiting vulnerable public facing applications, phishing campaigns, and abusing stolen credentials to gain remote access.
The encryptor itself is a .NET executable protected with ConfuserEx, a tool that strips identifying watermarks and adds anti tampering layers before analysis begins.
From there, the malware disables Windows Defender’s Controlled Folder Access, deletes shadow copies, wipes backup related files... The ransomware wraps up by dropping a note called EVERESTRANSOMWARE.txt into every affected folder and on the desktop, before triggering a delayed self deletion routine to erase its own tracks.
One of the more unusual traits AttackIQ flagged is the ransomware’s use of Wake on LAN broadcasts, sent to force sleeping machines on the network to power up so they too can be encrypted.
Security teams should expand emulation coverage to include Wake on LAN broadcasts, mapped drive enumeration, and active network connection discovery, since these behaviors reflect genuine attacker movement rather than isolated test conditions.
"The group alleges it obtained approximately 90GB of internal data... the data is described as a database and internal company documentation."
"Everest Ransomware Says It Breached Brazilian Energy Giant Petrobras" / "demanding contact through qTox"
Despite boasting about stealing a full terabyte of data from a victim organization, the actual malware sample used in the intrusion contains no code capable of exfiltrating anything at all.
Everest has been active since at least December 2020 as a double extortion operation, combining file encryption with theft of sensitive data before deployment.
4 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
IPs, domains, and DNS infrastructure linked to this family.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
49 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Double-extortion ransomware active since at least December 2020. It encrypts files, drops an EVERESTRANSOMWARE.txt note, appends a .everest extension, disables defenses, deletes shadow copies and backup-related files, removes Raccine, uses Wake-on-LAN to wake sleeping hosts for broader encryption, and self-deletes after execution. The analyzed sample contained no data-exfiltration capability, suggesting any theft occurred earlier in the intrusion via separate tools.
A ransomware operation mentioned as one of the actors contributing to Japan’s victim count in Q1 2026.
Everest is a ransomware-as-a-service operation using double extortion: stealing data, encrypting systems, and threatening public release if victims do not pay. The content also states it has expanded into initial access brokerage by selling network footholds to other threat actors.
Ransomware used in attacks against organizations in South Korea (exhibition management platform and an elevator manufacturer).
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.