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The Stealthy Stalker: Remcos RAT
- McAfee Labs has identified a significant rise in the Remcos RAT threat in Q3 2024.
- The malware is often delivered through phishing emails and malicious attachments, allowing cybercriminals to remotely control infected machines and compromising sensitive data.
- In a technical analysis of two Remcos RAT variants, highly obfuscated PowerShell scripts are executed to download and inject multiple files into a legitimate Microsoft .NET executable, eventually leading to the installation of the Remcos payload.
- In variant 2, the Remcos RAT comes from an Office Open XML document, which is downloaded from a spam email attachment and imported using the CVE-2017-11882 Equation Editor vulnerability.
- The VBS script from variant 2, which is highly obfuscated, launches PowerShell using Base64 encoded strings as the command.
- Once the assembly “dnlib.dll” is loaded, it calls a method VAI from a type dnlib.IO.Home within the loaded assembly.
- Organizations can better protect their systems and sensitive data from Remcos RAT by implementing robust defenses such as regular software updates, email filtering, and network monitoring.
- By staying vigilant and informed about emerging threats like Remcos RAT, organizations can safeguard against future cyberattacks.
- IOCs and detections for each variant are also provided in the article.
- References to the original source of the article are given at the end of the blog post.
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