Everest

MITRE ATT&CK does not currently catalogue Everest, so this is our assessment of the techniques it uses, drawn from public reporting. The techniques themselves, and every "what that means" definition below, come from MITRE ATT&CK v19.2. Confidence: medium. Treat it as orientation, not attribution.

1. T1059.001 PowerShell Execution

   What they do: everest uses PowerShell scripts to execute malicious commands and deploy ransomware payloads across compromised systems.

   What that means: Adversaries may abuse PowerShell commands and scripts for execution.

2. T1547.001 Registry Run Keys / Startup Folder PersistencePrivilege Escalation

   What they do: everest modifies Windows Registry Run Keys to ensure ransomware execution persists across reboots on compromised hosts.

   What that means: Adversaries may achieve persistence by adding a program to a startup folder or referencing it with a Registry run key.

3. T1685 Disable or Modify Tools Defense Impairment

   What they do: everest disables or modifies security tools like antivirus software to evade detection during initial compromise and execution phases.

   What that means: Adversaries may disable, degrade, or tamper with security tools or applications (e.g., endpoint detection and response (EDR) tools, intrusion detection systems (IDS), antivirus, logging agents, sensors, etc.) to impair or reduce visibility of defensive capabilities.

4. T1070.004 File Deletion Stealth

   What they do: everest deletes Volume Shadow Copies and backup directories via system commands to prevent data recovery without payment.

   What that means: Adversaries may delete files left behind by the actions of their intrusion activity.

5. T1003.001 LSASS Memory Credential Access

   What they do: everest accesses LSASS memory using credential-stealing tools to harvest user credentials for lateral access and evasion.

   What that means: Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).

6. T1135 Network Share Discovery Discovery

   What they do: everest performs network share discovery to identify accessible remote directories for lateral movement and victim data targeting.

   What that means: Adversaries may look for folders and drives shared on remote systems as a means of identifying sources of information to gather as a precursor for Collection and to identify potential systems of interest for Lateral Movement.

7. T1021.002 SMB/Windows Admin Shares Lateral Movement

   What they do: everest exploits SMB/Windows Admin Shares for lateral movement between networked systems within victim environments.

   What that means: Adversaries may use Valid Accounts to interact with a remote network share using Server Message Block (SMB).

8. T1486 Data Encrypted for Impact Impact

   What they do: everest encrypts victim files using custom ransomware binaries to maximize impact and force ransom payments.

   What that means: Adversaries may encrypt data on target systems or on large numbers of systems in a network to interrupt availability to system and network resources.

9. T1489 Service Stop Impact

   What they do: everest executes Service Stop commands to terminate critical services, disrupting operational continuity during ransomware deployment.

   What that means: Adversaries may stop or disable services on a system to render those services unavailable to legitimate users.

10. T1490 Inhibit System Recovery Impact

    What they do: everest invokes system recovery inhibition commands to prevent backup restoration and isolate compromised machines.

    What that means: Adversaries may delete or remove built-in data and turn off services designed to aid in the recovery of a corrupted system to prevent recovery.

Software Everest has been seen using, grouped by what it is used for. Legitimate administration tools appear here because these actors routinely abuse them — presence in this list is not itself malicious.

Tool data from Ransomware Tool Matrix by BushidoUK, licensed CC BY 4.0. Grouped by purpose and matched to this group by Breach House.

The note this group leaves on a compromised machine. Click a filename to read it.

Dear [snip],
Greetings from the Everest team. Your systems have been attacked, the files are encrypted. You can read about us in our blog (Tor browser needed)
Blog : ransomocmou6mnbquqz44ewosbkjk3o5qjsl3orawojexfook2j7esad.onion
Or read about our group in Twitter
Also, our team was able to bypass your "Dataprotection" as any other your protection software and more than 1 Terabyte of internal files were exfiltrated to our servers, which we can confirm with great joy and ease
The list contains financial documents, internal orders, KYC information(documents,photos...), trusted representatives personal info
Client risk levels,loans, debt and client data. Various financial documentation, backups , etc. etc.
The information was collected both from personal PCs and from centralized storage locations.
If an agreement is reached with us, this information will never be published and the problem will disappear as if it never happened, otherwise it will be posted on our blog and darknet. Which will lead to even greater financial and reputational losses on your part.
Also you will get 
1.Attack logbook (months of experience with your company) with full list of vulnerabilities and bypass methods
2.Advices how to singifically improve your security and avoid such attacks in the future
3.We will delete all files from your company
4.We will attack your company no more
Yours trully Everest Team
Email to contact: [email protected]
Your key: 
[snip]

Ransom-note text from RansomLook, licensed CC BY 4.0.