Weyhro

MITRE ATT&CK does not currently catalogue Weyhro, 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: weyhro executes malicious commands via PowerShell scripts to stage payloads and manipulate system behavior.

   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: weyhro leverages registry run keys to maintain persistence across system reboots.

   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: weyhro disables antivirus tools and security monitoring processes to evade detection during deployment.

   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. T1688 Safe Mode Boot Defense Impairment

   What they do: weyhro manipulates boot sequences to disable recovery mechanisms and enforce impact.

   What that means: Adversaries may abuse Windows safe mode to disable endpoint defenses.

5. T1027.013 Encrypted/Encoded File Stealth

   What they do: weyhro encodes victim files with symmetric encryption keys before demanding ransom payments.

   What that means: Adversaries may encrypt or encode files to obfuscate strings, bytes, and other specific patterns to impede detection.

6. T1070.004 File Deletion Stealth

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

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

7. T1049 System Network Connections Discovery Discovery

   What they do: weyhro enumerates active network connections to identify high-value targets for encryption.

   What that means: Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.

8. T1135 Network Share Discovery Discovery

   What they do: weyhro scans network shares using native tools to identify victim file structures and encryption targets.

   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.

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

   What they do: weyhro moves laterally through SMB shares to compromise additional hosts within the network.

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

10. T1486 Data Encrypted for Impact Impact

    What they do: weyhro encrypts victim files using custom ransomware binaries targeting critical business data.

    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.