Researchers have uncovered a sophisticated malware campaign by the Chinese state-sponsored threat group Mustang Panda, which leverages its well-known PlugX Remote Access Trojan (RAT). The attack begins with a fake browser update delivered through malicious files such as Browser_Update.zip and a disguised image file. Victims are presented with a convincing update window impersonating legitimate software, encouraging them to install what appears to be a routine update. This multi-stage approach helps attackers evade traditional security tools by splitting malicious functionality across several components. After execution, the malware downloads a disguised MSI installer that drops three files: Avk.exe, Avk.dll, and AVKTray.dat. The attackers abuse a legitimate, digitally signed G DATA antivirus executable (Avk.exe) to perform DLL sideloading, allowing malicious code to run under the guise of trusted software. The malicious DLL decrypts and loads the PlugX payload directly into memory using multiple layers of encryption and threadpool execution techniques, making detection and forensic analysis more difficult. Once installed, PlugX establishes persistence through Windows Registry Run keys and communicates with its command-and-control (C2) server over HTTPS, disguising its traffic as normal Microsoft Edge browser activity. The malware supports extensive capabilities including file uploads/downloads, command execution, process management, system reconnaissance, and deployment of additional plugins. Security researchers recommend monitoring for the presence of Avk.exe, Avk.dll, and AVKTray.dat, as well as suspicious registry persistence entries, while focusing on behavioral detection rather than solely relying on indicators of compromise (IOCs).
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