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Rewterz Threat Alert – SmokeLoader Malware – Active IOCs
January 3, 2022
Rewterz Threat Alert – Mirai Botnet – Active IOCs
January 3, 2022

Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs

January 3, 2022

Severity

Medium

Analysis Summary

Since 2019, Guloader has been in operation as a downloader. GuLoader spreads through spam campaigns with malicious archived attachments. GuLoader downloads the bulk of malware, with the most frequent being AgentTesla, FormBook, and NanoCore. The encrypted payloads of this downloader are usually saved on Google Drive. It also got its payloads from Microsoft OneDrive and websites that were controlled by an attacker. GuLoader can avoid network-based detection by using genuine file-sharing websites, which aren’t often filtered or inspected in corporate contexts.

Impact

  • Information Theft
  • Security Bypass

Indicators of Compromise

MD5

  • a6995d610d05f1befd4d55a11c8316a2
  • 8205d65f76fa63e73b7685faf647a048
  • ae871d1957030344d4cefc7295a1e964
  • 81f377eda4163da1b74cae83e38ced9f

SHA-256

  • 9a0f607996d23c505d63f1d79812e9cceff9175ef763055a6c67bdf599e5aa5e
  • 16c6a61f609b7ef5cd13fc587805018efad3be42545912f4281adde004cf928b
  • 6f8a836d10eada55bb1d3901ceb5b97711afc9f7018e3bd0f0a8e77521f18e5b
  • a16d035ca37dbd7ab34c856f4cdf96a9898dcebba08c5801c99f3d3100ae6b3f

SHA-1

  • af92a7717a7168c77623464b566c99eeba8aa7e1
  • 79ea7b6dda9d45f021150d57ce90f340cef35940
  • 73e0d642d14ca3dcfca3d22fa2312968d1ba5cd6
  • e50abaf01a9fd3ae8176b5b6117f6b8f8a355ec0

Remediation

  • Search for IOCs in your environment.
  • Block all the threat indicators at your respective controls.
  • Do not download files attached in untrusted emails.
  • Do not download files from untrusted sources on the internet
  • 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
    • Careers
    • Contact
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