Bert

MITRE ATT&CK does not currently catalogue Bert, 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: bert uses PowerShell scripts to execute malicious commands and spread payloads 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: bert adds malicious registry run keys to ensure persistence across reboots on infected hosts.

   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: bert disables antivirus and monitoring tools by terminating security processes and modifying system configurations.

   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. T1027.013 Encrypted/Encoded File Stealth

   What they do: bert encodes victim files with symmetric encryption keys before demanding payment for decryption.

   What that means: Adversaries may encrypt or encode files to obfuscate strings, bytes, and other specific patterns to impede detection.

5. T1070.004 File Deletion Stealth

   What they do: bert deletes Volume Shadow Copies and backup files via command-line utilities 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: bert discovers remote systems via port scanning to expand foothold within the network.

   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. T1049 System Network Connections Discovery Discovery

   What they do: bert enumerates active network connections to identify high-value targets for lateral movement.

   What that means: Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.

8. T1135 Network Share Discovery Discovery

   What they do: bert probes network shares using SMB tools 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.

9. T1486 Data Encrypted for Impact Impact

   What they do: bert encrypts victim files using custom ransomware binaries targeting critical data directories.

   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. T1491.001 Internal Defacement Impact

    What they do: bert displays ransom notes and defaces web content on compromised servers to pressure victims.

    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.

The note this group leaves on a compromised machine. Click a filename to read it.

Hello from Bert!

 
Your network is hacked and files are encrypted.
We download some important files from your network.

 
Instructions for contacting our team:
Download the (Session) messenger (https://getsession.org) in messenger :ID  05149ef8a65c342bc76bad335ad3a314ec1321b18cdb6092667083b4e56a4dcb41 

bertblogsoqmm4ow7nqyh5ik7etsmefdbf25stauecytvwy7tkgizhad.onion our blog

Ransom-note text from RansomLook, licensed CC BY 4.0.