Kraken

MITRE ATT&CK does not currently catalogue Kraken, 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: kraken executes malicious commands via PowerShell scripts to stage payloads and evade detection.

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

2. T1685 Disable or Modify Tools Defense Impairment

   What they do: kraken disables antivirus tools by terminating security processes and modifying service configurations.

   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. T1070.004 File Deletion Stealth

   What they do: kraken deletes Volume Shadow Copies and backup directories via vssadmin and system commands.

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

4. T1018 Remote System Discovery Discovery

   What they do: kraken discovers remote hosts using nmap scans to map the internal network topology.

   What that means: Adversaries may attempt to get a listing of other systems by IP address, hostname, or other logical identifier on a network that may be used for Lateral Movement from the current system.

5. T1135 Network Share Discovery Discovery

   What they do: kraken scans network shares using net use 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.

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

   What they do: kraken spreads laterally through SMB shares to encrypt additional systems within the network.

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

7. T1486 Data Encrypted for Impact Impact

   What they do: kraken encrypts victim files using a custom ransomware algorithm targeting documents and backups.

   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.

8. T1490 Inhibit System Recovery Impact

   What they do: kraken prevents system recovery by corrupting restore points and disabling backup services.

   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.

Hello dear user!

!!! Do not interrupt encryption process, it causes full data loss. !!!

Contact support using the following methods and decrypt one non-important file for free.

Contact us method below:
Use TOR Browser: http://bd56nsu2p5wnosagb7ipzk33efhhufjmc2sy4yqr3upyxulg535gemqd.onion/[snip]

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