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Rewterz Threat Alert – Cobalt Strike Malware – Active IOCs
November 11, 2021
Rewterz Threat Alert – Dridex Banking Trojan – Active IOCs
November 11, 2021

Rewterz Threat Alert – NJRAT – Active IOCs

November 11, 2021

Severity

Medium

Analysis Summary

NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple versions of the secondary payload used, ranging from base64 encoded version, hexadecimal, JSON data format, compressed blobs, and also plain text data with malicious URLs embedded within. This is done in order to evade detection by security products and increase the possibility of operating unnoticed. njRat is developed in .NET framework and is able to hijack the functions of a compromised machine remotely, including taking screenshots, exfiltrating data, keylogging, and killing processes such as antivirus programs, while also connecting the machine to a botnet. RAT was also found abusing Windows API functions such as Windows API calls such as GetKeyboardState(), GetAsynckeyState(), MapVirtualKey() for keylogging, and data theft. It was also discovered downloading web scraping tools such as “proxy scrapper” in order to extract large amounts of data via proxies.

Impact

  • Unauthorized Access

Indicators of Compromise

MD5

  • 700c7757b81e5e615b8cab09008c08f6
  • a601df2c73f63a84778303a96d681665
  • 1856b06c2392d0a5e7b73f4e98e3a840
  • a8535d5778f0d6177d4a0f6623ae7ad5

SHA-256

  • 99965cf49e14830c3080cfc35132770063cb19836ef2eb7c5dbe121eb889ca25
  • 64f9f7907d9d7c486cbad8d452c75cfed218ec8b8a1dccf97764a284085919a0
  • 48cc6bd83e2933df14dafd0ed0e119215ed134fc57167b768c48202b54d4bb41
  • 0f9a62ff1c6cd64e3f114e61890c62c3e7ac67f1b96010e0d5017386aae9d845

SHA-1

  • 5e15027312cacc8c390659ca7cfc7d2f49c12b19
  • e24836a3c8a577bf981df3adc0b66fdea713562f
  • 23a8cf21174428413fac5fe98b02035b9a8d6857
  • a45fdd4f8b93faf01e70a3635d3ea0dd8ffd9d52

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
    • Careers
    • Contact
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