Arcusmedia

MITRE ATT&CK does not currently catalogue Arcusmedia, 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: arcusmedia executes malicious payloads via PowerShell scripts to stage ransomware deployment across compromised systems.

   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: arcusmedia persists by creating registry run keys containing paths to their encrypted ransomware executable.

   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: arcusmedia disables antivirus tools by terminating security processes and modifying Windows Defender settings 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.

4. T1027.016 Junk Code Insertion Stealth

   What they do: arcusmedia injects junk code into legitimate binaries to evade static analysis and pack their malicious components.

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

5. T1070.004 File Deletion Stealth

   What they do: arcusmedia deletes Volume Shadow Copies and backup directories via vssadmin commands to prevent recovery.

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

6. T1018 Remote System Discovery Discovery

   What they do: arcusmedia discovers remote systems via SMB and LDAP queries to map the victim network for expansion.

   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.

7. T1135 Network Share Discovery Discovery

   What they do: arcusmedia 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.

8. T1567.002 Exfiltration to Cloud Storage Exfiltration

   What they do: arcusmedia exfiltrates stolen data using encrypted channels before deployment to enable double extortion.

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

9. T1486 Data Encrypted for Impact Impact

   What they do: arcusmedia encrypts victim files using custom ransomware binaries targeting documents and backups with high-entropy ciphers.

   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: arcusmedia calls system recovery inhibitors like shutdown scripts to prevent forensic analysis and system restoration.

    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.