Vidar Malware Hides Second-Stage Payloads in JPEG and TXT Files to Evade Detection

The article discusses a sophisticated malware called Vidar that employs advanced evasion techniques to avoid detection by security systems. Here are the key points:

1. Multi-Stage Delivery:

   • The malware uses multiple stages of delivery, starting with an initial payload and then fetching additional components from remote servers.

2. Obfuscation Techniques:

   • The second stage payloads are hidden within JPEG images and TXT files to evade detection by file scanners.
   • These files contain obfuscated Base64-encoded data that is decoded and executed in memory.

3. Execution Chain:

   • A VBScript (VBS) file is used to download a malicious DLL from an HTTP server.
   • The VBS script then uses WMI commands to execute the downloaded DLL, which further downloads additional payloads.

4. Final Payload:

   • The final payload is a 64-bit C++ executable that employs runtime API resolution techniques to avoid detection by security software.

5. Detection and Mitigation Strategies:

   • Security teams should monitor for outbound connections to direct IP-based HTTP endpoints.
   • Watch for chains of WScript and PowerShell process spawns.
   • Restrict execution of RegAsm.exe to

Read the full article at Cyber Security News

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