A newly identified malware campaign known as CountLoader is actively distributing cryptocurrency clipper malware through a sophisticated multi-stage infection chain. Researchers observed attackers leveraging obfuscated JavaScript, PowerShell scripts, and in-memory shellcode execution to compromise systems while evading traditional security controls. The campaign demonstrates advanced persistence and stealth techniques, making detection significantly more difficult for endpoint security products. The attack chain begins with a malicious executable that launches a PowerShell one-liner responsible for downloading and decoding a heavily obfuscated JavaScript payload. The script is executed using mshta.exe, a legitimate Windows utility frequently abused by threat actors to bypass security monitoring. Once executed, the malware establishes persistence through scheduled tasks and initiates communication with multiple command-and-control (C2) servers using encrypted traffic and randomized keys. The infection process includes several layers, including a JavaScript loader, PowerShell packer, injector module, and memory-resident shellcode execution. The malware disables Windows security mechanisms such as AMSI before injecting malicious code into trusted processes. The final payload functions as a cryptocurrency clipper, continuously monitoring clipboard activity and replacing copied wallet addresses with attacker-controlled cryptocurrency wallets. Researchers also identified USB propagation capabilities, where malicious shortcut files replace legitimate content on removable drives to expand infections silently.
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