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Rewterz Threat Alert – Cobalt Strike Malware – Active IOCs
January 9, 2023
Rewterz Threat Alert – Chaos Ransomware – Active IOCs
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Rewterz Threat Alert – Oski Data Stealer Malware – Active IOCs

January 9, 2023

Severity

High

Analysis Summary

The Oski stealer is a malicious data stealer that was originally discovered in November 2019. This successful data-harvesting tool is spreading throughout North America and China, gathering account passwords, credit card information, and other sensitive data. This form of malware is still one of the most common types of malware employed in cyber-attacks. The dashboard of Oski C2 reveals that Oski’s stealing strategies include utilizing man-in-the-browser (MitB) attacks to extract passwords via hijacking browser processes using DLL injection. According to research, this data thief is spread via fraudulent websites that are opened as a result of a router’s DNS settings being hijacked.

Impact

  • Credential Thefts
  • Unauthorized Access
  • Information Theft

Indicators of Compromise

MD5

  • c927fbf0a308f0a52924210896ab4efa

SHA-256

  • a1fb5c784bc7054210483191ef7a6c47da443b4283442de4eb0d297bce669751

SHA-1

  • 6e139eeb5094862192d5f260b2a62beec9b910f4

Remediation

  • Search for IOCs in your environment.
  • Block all threat indicators at your respective controls. 
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    • Assess
      • Compromise Assessment
      • APT Assessment
      • Penetration Testing
      • Secure Architecture Design & Review
      • Red Team Assessment
      • Purple Team Assessment
      • Social Engineering
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    • Respond
      • Incident Response
      • Incident Analysis
  • Transform
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    •     SOC Maturity Assessment
    •     SOC Model Evaluation
    •     SOC Gap Analysis
    •     SIEM Gap Analysis
    •     SIEM Optimization
    •     SOC Content Pack
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    • 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
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