Remcos RAT Infection Chain Hides Behind Obfuscated Scripts and Trusted Windows Binaries

The article discusses a sophisticated malware attack involving the Remcos Remote Access Trojan (RAT) that leverages obfuscation techniques to evade detection and establish a foothold in targeted systems. Here are the key points:

1. Initial Infection Vector: The attack starts with an email containing a malicious document, likely a Word or Excel file, which contains macros designed to download additional malware.

2. Payload Delivery:

   • A PowerShell script is downloaded from a remote server.
   • This script uses Base64 encoding and obfuscation techniques to evade detection by security tools.
   • The script bypasses execution policy restrictions using the -ExecutionPolicy Bypass flag.

3. Living-off-the-Land Techniques:

   • The malware leverages legitimate Microsoft binaries like aspnet_compiler.exe for its activities, making it harder to detect as malicious traffic appears normal.
   • A secondary payload (Cqeqpvzeia.exe) is embedded in the script and injected into aspnet_compiler.exe.

4. In-Memory Execution:

   • The malware loads a .NET assembly called ALTERNATE.dll directly into memory using Reflection APIs, without writing any files to disk.
   • This technique helps evade

Read the full article at Cyber Security News

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