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Everest is a Windows ransomware family associated with a closed, Russian-speaking cybercriminal operation active since at least December 2020. The operation combines ransomware deployment, data-theft extortion, initial access brokerage, and recruitment of corporate insiders. Its targets span North America, Europe, and Asia, including healthcare, government, telecommunications, financial services, and professional services. Associated intrusions have involved phishing, exploitation of vulnerable public-facing applications, and compromised credentials.
The Everest encryptor is a .NET executable protected with ConfuserEx. Analyzed implementations generate AES-128-CBC key material locally and protect encryption keys with an embedded RSA public key; one examined sample used RSA-1024. The malware fully encrypts smaller files and partially encrypts larger files to accelerate processing, then leaves ransom notes. It checks for duplicate execution and avoids systems configured with certain Commonwealth of Independent States language or locale settings.
Before and during encryption, Everest undermines defenses and recovery by disabling Windows Defender Controlled Folder Access, removing the Raccine anti-ransomware tool, deleting shadow copies and restore points, and deleting backup-related files. Background threads terminate analysis tools, security software, and resource-intensive processes. Observed behavior also includes network discovery, Wake-on-LAN broadcasts intended to make sleeping machines available for encryption, and delayed self-deletion.
The ransomware payload is distinct from the operation's broader intrusion toolset. One examined encryptor contained no data-exfiltration functionality; associated data theft is conducted separately. Everest also conducts encryptionless extortion, so an extortion claim does not establish deployment of its ransomware. Its operators have sold network access since 2021 and advertised paid insider recruitment since 2023.
2 distinct threat actors Mallory has associated with this family across public reporting. Open in Mallory to see the full evidence chain and overlapping campaigns.
A July 10, 2026 Picus analysis describes a Windows-focused Everest encryptor that generates key material locally and appends an Everest extension to encrypted files.
"This latest blog documents the TTPs employed by a group who were observed deploying Everest ransomware during a recent incident response engagement."
23 distinct techniques documented for this family, organized by ATT&CK tactic.
Everest has operated as an initial access broker since November 2021, selling stolen VPN and RDP credentials to other criminal operators.
Its usual playbook involves exploiting vulnerable public facing applications, phishing campaigns, and abusing stolen credentials to gain remote access.
Its usual playbook involves exploiting vulnerable public facing applications, phishing campaigns, and abusing stolen credentials to gain remote access.
Everest has operated as an initial access broker since November 2021, selling stolen VPN and RDP credentials to other criminal operators.
From there, the malware disables Windows Defender’s Controlled Folder Access, deletes shadow copies, wipes backup related files, and even strips Raccine, an open source anti ransomware tool, out of the registry entirely.
Everest has operated as an initial access broker since November 2021, selling stolen VPN and RDP credentials to other criminal operators.
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.
Everest has operated as an initial access broker since November 2021, selling stolen VPN and RDP credentials to other criminal operators.
Execution follows a clear pattern starting with a mutex check... Mutex Global\7efc73f7-fda1-42d1-a4c5-8f1670bd08a5 Single-instance mutex used to prevent duplicate execution
From there, the malware disables Windows Defender’s Controlled Folder Access, deletes shadow copies, wipes backup related files, and even strips Raccine, an open source anti ransomware tool, out of the registry entirely.
Everest disables Windows shadow copies and Controlled Folder Access and removes the open-source anti-ransomware tool Raccine. Play deploys EDR-killer drivers ahead of Active Directory reconnaissance and credential-access activity.
Everest uses ProcDump for credential dumping. Play's tooling includes credential-access techniques like HandleKatz and Nanodump used for stealthy LSASS memory access.
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.
Known IOCs associated with Everest include SoftPerfect Network Scanner and ProcDump for credential dumping and reconnaissance. Play uses AdFind, a command-line Active Directory query tool used for network discovery.
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.
Execution follows a clear pattern starting with a mutex check and a geo fencing routine that avoids systems configured with Commonwealth of Independent States language or locale settings.
"access a server on November 8–9, 2025, and copy data without permission."
Everest uses remote access software such as AnyDesk, Splashtop, and Atera to maintain persistence and exfiltrate data after initial compromise.
"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.
The Everest ransomware gang listed Frost Bank and Citizens Financial Group on its dark web leak site on April 20th, setting a six-day deadline before publicly releasing stolen data.
"publicly disclosed the victims on their Dedicated Leak Sites (DLS)"
In the aftermath of the Colonial Pipeline ransomware attack, the underground cybercrime ecosystem is reshuffling... The first to go was Darkside, the ransomware gang that orchestrated the Colonial Pipeline attack.
Before encryption, Everest disables Windows shadow copies.
Cl0p campaigns quietly exfiltrate data for weeks, then publicly extort victims. Everest, BianLian, Medusa, INC Ransom, and Rhysida use stolen data and leak-site publication as extortion leverage.
5 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Values are masked here and available in full in Mallory.
66 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.