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Rewterz Threat Alert – Emerging Black Basta Ransomware – Active IOCs

December 22, 2022

Severity

High

Analysis Summary

Black Basta is a new emerging ransomware that encrypts data stored on clients’ hard drives. It has been active since April 2022 and employs a double-extortion attack technique. In July 2022, the Black Basta ransomware group has added a new capability that encrypts VMware ESXi virtual machines (VMs) on Linux servers

A new strain of the Black Basta ransomware that supports encryption of VMWare ESXi servers. They have been reporting on similar encryptors issued by a number of different groups, including LockBit, HelloKitty, BlackMatter, REvil, AvosLocker, RansomEXX, and Hive, among others.

Black Basta’s ransomware binary, like other Linux encryptors, will search for the /vmfs/volumes where virtual machines are kept on the compromised ESXi servers (if no such folders are found, the ransomware exits).

To encrypt the data, the ransomware uses the ChaCha20 algorithm. It also uses multithreading to make use of many processors and accelerate the encryption operation. The ransomware appends the .basta extension to encrypted filenames and creates readme.txt ransom notes in each folder.

Impact

  • Files Encryption

Indicators of Compromise

MD5

432ef25107f4c29775ecc469699d02fb

SHA-256

4da76668000e24cbd75973f45a6a2c273c6292161348fa84f996d5f5e6fd4152

SHA-1

c74dc4765adcf729367068b4570ca3ea1bba7e0d

Remediation

  • Block all threat indicators at your respective controls.
  • Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
  • Maintain cyber hygiene by updating your anti-virus software and implementing patch management lifecycle.
  • Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
  • Emails from unknown senders should always be treated with caution.
  • Never trust or open links and attachments received from unknown sources/senders
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      • Compromise Assessment
      • APT Assessment
      • Penetration Testing
      • Secure Architecture Design & Review
      • Red Team Assessment
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      • Social Engineering
      • Source Code Review
    • Respond
      • Incident Response
      • Incident Analysis
  • Transform
    • SOC Consultancy
    •     SOC Maturity Assessment
    •     SOC Model Evaluation
    •     SOC Gap Analysis
    •     SIEM Gap Analysis
    •     SIEM Optimization
    •     SOC Content Pack
  • Train
    • Security Awareness and Training
    • Tabletop Exercise
    • Simulated Cyber Attack Exercises
  • Managed Security
    • Managed Security Monitoring
      • Remote SOC
      • Onsite SOC
      • Hybrid SOC
    • Managed Security Services
      • Managed Detection and Response
      • Managed Endpoint Detection and Response
      • Managed Threat Intelligence
      • Managed Threat Hunting
      • Managed Risk-Based SOAR
      • Managed Penetration Testing
  • Solutions
  • Resources
    • Blog
    • Threat Advisory
  • Company
    • About Us
    • Careers
    • Contact
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