Bavacai

MITRE ATT&CK does not currently catalogue Bavacai, 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: Bavacai executes payloads via PowerShell to perform reconnaissance, privilege checks, and file targeting.

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

2. T1685 Disable or Modify Tools Defense Impairment

   What they do: Bavacai disables or modifies security tools such as EDR agents and backup restore mechanisms to hinder recovery.

   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: Bavacai deletes Volume Shadow Copies and backup artifacts via system commands to prevent restoration.

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

4. T1564.003 Hidden Window Stealth

   What they do: Bavacai hides its execution in hidden windows and disguises processes to evade endpoint detection.

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

5. T1135 Network Share Discovery Discovery

   What they do: Bavacai uses network share discovery to locate victim file shares and staging directories for encryption.

   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.

6. T1486 Data Encrypted for Impact Impact

   What they do: Bavacai encrypts victim files using its ransomware payload, targeting business documents and customer data.

   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: Bavacai inhibits system recovery by disabling restore points, backup services, and endpoint recovery tools.

   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: Bavacai performs internal defacement by replacing files with ransom notes and altered metadata.

   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.