Cryptnet

MITRE ATT&CK does not currently catalogue Cryptnet, 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: low. Treat it as orientation, not attribution.

1. T1059.001 PowerShell Execution

   What they do: cryptnet executes PowerShell scripts to stage payloads and perform initial system reconnaissance.

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

2. T1685 Disable or Modify Tools Defense Impairment

   What they do: cryptnet disables antivirus tools by terminating security processes and modifying system configurations to evade detection.

   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.

3. T1135 Network Share Discovery Discovery

   What they do: cryptnet scans network shares using net share commands to identify additional victims for lateral movement.

   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.

4. T1567.002 Exfiltration to Cloud Storage Exfiltration

   What they do: cryptnet exfiltrates stolen data through encrypted channels before deploying ransomware to maximize extortion leverage.

   What that means: Adversaries may exfiltrate data to a cloud storage service rather than over their primary command and control channel.

5. T1486 Data Encrypted for Impact Impact

   What they do: cryptnet encrypts victim files using a custom encryption routine, targeting documents and engineering data across affected systems.

   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.

6. T1490 Inhibit System Recovery Impact

   What they do: cryptnet invokes system recovery inhibitors via command-line tools to prevent backup restoration attempts.

   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.

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

*** CRYPTNET RANSOMWARE ***

--- What happened? ---
All of your files are encrypted and stolen. Stolen data will be published soon
on our tor website. There is no way to recover your data and prevent data leakage without us
Decryption is not possible without private key. Don't waste your and our time to recover your files. 
It is impossible without our help

--- How to recover files & prevent leakage? ---
To make sure that we REALLY CAN recover your data - we offer FREE DECRYPTION for warranty. 
We promise that you can recover all your files safely and prevent data leakage. We can do it!

--- Contact Us---
Download Tor Browser - https://www.torproject.org/download/ and install it
Open website:  http://cryptr3fmuv4di5uiczofjuypopr63x2gltlsvhur2ump4ebru2xd3yd.onion
Enter DECRYPTION ID:  [snip]

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