Entropy

MITRE ATT&CK does not currently catalogue Entropy, 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: entropy executes malicious PowerShell commands to stage payloads and manipulate system behavior.

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

2. T1106 Native API Execution

   What they do: entropy leverages native API calls to execute cryptographic functions and evade detection.

   What that means: Adversaries may interact with the native OS application programming interface (API) to execute behaviors.

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

   What they do: entropy adds malicious registry run keys to ensure persistence across reboots.

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

4. T1685 Disable or Modify Tools Defense Impairment

   What they do: entropy disables security tools like EDR and AV by terminating processes or modifying 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.

5. T1027.016 Junk Code Insertion Stealth

   What they do: entropy inserts junk code into legitimate binaries to evade static analysis and behavioral detection.

   What that means: Adversaries may use junk code / dead code to obfuscate a malware’s functionality.

6. T1070.004 File Deletion Stealth

   What they do: entropy deletes Volume Shadow Copies and backup files via command-line tools to prevent recovery.

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

7. T1083 File and Directory Discovery Discovery

   What they do: entropy discovers files and directories using Windows API calls to identify critical data for encryption.

   What that means: Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system.

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

   What they do: entropy moves laterally via SMB shares to encrypt additional systems within the victim network.

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

9. T1486 Data Encrypted for Impact Impact

   What they do: entropy encrypts victim files using custom symmetric encryption routines applied across the compromised system.

   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.

10. T1490 Inhibit System Recovery Impact

    What they do: entropy invokes system recovery inhibition commands to prevent automatic 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.