UmBra

MITRE ATT&CK does not currently catalogue UmBra, 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 v20.0. Confidence: medium. Treat it as orientation, not attribution.

1. T1059.001 PowerShell Execution

   What they do: UmBra executes malicious commands through PowerShell scripts to automate initial compromise and reconnaissance.

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

2. T1112 Modify Registry PersistenceDefense Impairment

   What they do: UmBra modifies Windows Registry Run keys to establish persistence across reboots on compromised hosts.

   What that means: Adversaries may interact with the Windows Registry as part of a variety of other techniques to aid in defense evasion, persistence, and execution.

3. T1685 Disable or Modify Tools Defense Impairment

   What they do: UmBra disables security tools by terminating antivirus processes and modifying Windows Defender settings via native APIs.

   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: UmBra deletes Volume Shadow Copies and recycle bins via vssadmin and system commands to prevent recovery.

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

5. T1564.003 Hidden Window Stealth

   What they do: UmBra operates through hidden console windows and obfuscated command chains to evade endpoint detection.

   What that means: Adversaries may use hidden windows to conceal malicious activity from the plain sight of users.

6. T1083 File and Directory Discovery Discovery

   What they do: UmBra uses file and directory discovery via PowerShell to enumerate critical system and data folders before 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.

7. T1485 Data Destruction Impact

   What they do: UmBra performs data destruction by overwriting encrypted remnants and deleting original files post-ransomware.

   What that means: Adversaries may destroy data and files on specific systems or in large numbers on a network to interrupt availability to systems, services, and network resources.

8. T1486 Data Encrypted for Impact Impact

   What they do: UmBra encrypts victim files using a custom ransomware payload, targeting documents and backups with high-entropy ciphering.

   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.

9. T1489 Service Stop Impact

   What they do: UmBra stops critical Windows services like backup and monitoring utilities using net stop commands to disrupt defenses.

   What that means: Adversaries may stop or disable services on a system to render those services unavailable to legitimate users.

10. T1490 Inhibit System Recovery Impact

    What they do: UmBra inhibits system recovery by corrupting backup restore mechanisms and disabling automated repair 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.