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Rewterz Threat Alert – Kimsuky APT Group – Active IOCs
March 21, 2022
Rewterz Threat Update – Transneft Data Leaked by Anonymous – Russian-Ukrainian Cyber Warfare
March 21, 2022

Rewterz Threat Alert – B1txor20 – Active IOCs

March 21, 2022

Severity

Medium

Analysis Summary

B1txor20 is a linxu-based backdoor which builds C2 communication channels using DNS Tunnel Technology. Along with its traditional backdoors, it also has functions like Socket5 proxy and remote installation and downloading rootkits. Since it is a fairly new backdoor, there are still some bugs present in the backdoor. The backdoor uses ZLIB compression, Base64 encoding, and RC4 encryption to protect it’s traffic. The main features currently supported are shown below.

  1. SHELL
  2. Proxy
  3. Execute arbitrary commands
  4. Install Rootkit
  5. Upload sensitive information

Basic Flowchart from Netlab.

Impact

  • Information Theft and Espionage
  • Exposure of Sensitive Data

Indicators of Compromise

IP

  • 194[.]165[.]16[.]24

URL

  • http[:]//179[.]60[.]150[.]23[:]8000/xExportObject[.]class
  • http[:]//194[.]165[.]16[.]24[:]8229/b1t_1t[.]sh
  • http[:]//194[.]165[.]16[.]24[:]8228/b1t
  • http[:]//194[.]165[.]16[.]24[:]8228/_run[.]sh
  • http[:]//194[.]165[.]16[.]24[:]8229/b4d4b1t[.]elf

Remediation

  • Block all threat indicators at your respective controls.
  • Search for IOCs in your environment.
  • Services
    • Assess
      • Compromise Assessment
      • APT Assessment
      • Penetration Testing
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      • Incident Response
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  • Transform
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    •     SOC Maturity Assessment
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    •     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
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