Sicarii

MITRE ATT&CK does not currently catalogue Sicarii, 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: low. Treat it as orientation, not attribution.

1. T1059.001 PowerShell Execution

   What they do: sicarii executes malicious commands via PowerShell scripts to deploy payloads and manipulate system behavior.

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

2. T1685 Disable or Modify Tools Defense Impairment

   What they do: sicarii disables antivirus tools and system safeguards to evade detection during attack execution.

   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.

3. T1070.004 File Deletion Stealth

   What they do: sicarii deletes Volume Shadow Copies and backup artifacts to prevent data recovery.

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

4. T1083 File and Directory Discovery Discovery

   What they do: sicarii scans file and directory structures to identify critical data for encryption and targeting.

   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.

5. T1486 Data Encrypted for Impact Impact

   What they do: sicarii encrypts victim files using a custom ransomware payload, locking data for extortion.

   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.

6. T1489 Service Stop Impact

   What they do: sicarii terminates critical Windows services and processes to disrupt system functionality.

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

7. T1490 Inhibit System Recovery Impact

   What they do: sicarii invokes system recovery processes to inhibit backup restoration and persistence checks.

   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.