Mimori

MITRE ATT&CK does not currently catalogue Mimori, 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: Mimori executes payloads via PowerShell to stage ransomware binaries and manipulate system processes during initial compromise.

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

2. T1569.002 Service Execution Execution

   What they do: Mimori executes ransomware logic through Windows Service installation to ensure persistence and repeated impact execution.

   What that means: Adversaries may abuse the Windows service control manager to execute malicious commands or payloads.

3. T1685 Disable or Modify Tools Defense Impairment

   What they do: Mimori disables security tools by terminating antivirus 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. T1070.004 File Deletion Stealth

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

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

5. T1083 File and Directory Discovery Discovery

   What they do: Mimori uses file and directory discovery to enumerate critical data paths and identify encryption targets across victim systems.

   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.

6. T1486 Data Encrypted for Impact Impact

   What they do: Mimori encrypts victim files using strong symmetric encryption, targeting IT and retail/e-commerce data stores for maximum disruption.

   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.

7. T1490 Inhibit System Recovery Impact

   What they do: Mimori runs service stop commands to disable backup, monitoring, and recovery services before deploying ransomware impact.

   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.

8. T1491.001 Internal Defacement Impact

   What they do: Mimori performs internal defacement by replacing victim files with custom ransomware icons and ransom notes on affected systems.

   What that means: An adversary may deface systems internal to an organization in an attempt to intimidate or mislead users, thus discrediting the integrity of the systems.