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Rewterz Threat Advisory – ICS: Siemens SIMATIC CP 442-1 and CP 443-1 RNA Vulnerability
May 11, 2022
Rewterz Threat Advisory – CVE-2022-29885 – Apache Tomcat Vulnerability
May 12, 2022

Rewterz Threat Alert – Zeppelin Ransomware – Active IOCs

May 11, 2022

Severity

High

Analysis Summary

Zeppelin most commonly is distributed through phishing emails with macro-enabled documents attached, although it has also been known to spread via malvertising and RDP. Once on the system, Zeppelin leverages the same memory allocation techniques to run its payload in memory. In terms of the decryption routine, Zeppelin has evolved to load APIs onto the stack and implements additional obfuscation techniques. Both Buran and Zeppelin perform geolocation checks prior to proceeding with encryption, avoiding encrypting hosts located in Ukraine, Belarus, Kazakhstan, or Russia. For storing configuration data, a Registry key is created. The earliest versions of Zeppelin included the “Buran” keyword in the Registry key name, but have since switched to using “Zeppelin.” Zeppelin is also capable of creating persistence via a Registry Run key. Multiple instances of the executable are run, each with a different purpose. For example, one terminates processes associated with important files while also running Clipbanker to monitor the clipboard, while another is responsible for encryption of files. During encryption, both Buran and Zeppelin use add an infection marker to encrypted files. Finally, both drop a ransom note and open it using notepad.exe.

Impact

  • File Encryption

Indicators of Compromise

MD5

  • 5841ef35aaff08bb03d25e5afe3856a2

SHA-256

  • 1e3c5a0aa079f8dfcc49cdca82891ab78d016a919d9810120b79c5deb332f388

SHA-1

  • ffd228b0d7afe7cab4e9734f7093e7ba01c5a06e

Remediation

  • Block all threat indicators at your respective controls
  • Search for IOCs in your environment.
  • Services
    • Assess
      • Compromise Assessment
      • APT Assessment
      • Penetration Testing
      • Secure Architecture Design & Review
      • Red Team Assessment
      • Purple Team Assessment
      • 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
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    • Contact
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