Onyx

MITRE ATT&CK does not currently catalogue Onyx, 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: onyx executes malicious commands via PowerShell scripts to spread 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: onyx modifies registry run keys to ensure persistence and automatic execution on reboot.

   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: onyx disables security tools like antivirus software to evade detection during the attack chain.

   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: onyx 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.

5. T1018 Remote System Discovery Discovery

   What they do: onyx performs remote system discovery to map the network and locate high-value targets.

   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.

6. T1135 Network Share Discovery Discovery

   What they do: onyx discovers network shares using native API calls 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.

7. T1486 Data Encrypted for Impact Impact

   What they do: onyx encrypts victim files using custom ransomware binaries to maximize impact and extortion leverage.

   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: onyx invokes system recovery inhibition commands to lock down infrastructure and hinder remediation.

   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.