Fake WinRAR downloads hide malware behind a real installer

This report analyzes a multi-stage malicious fake WinRAR installer distributed from unofficial Chinese sites that unpacks nested payloads (including a legitimate-looking installer and a malicious HTA), executes memory-only stages, and ultimately drops Winzipper-associated backdoor components (e.g., nimasila360.exe). The author documents static and dynamic analysis techniques, persistence and data-access behavior (Windows Profiles), and provides IOCs (domains and filenames) blocked by Malwarebytes to help detection and mitigation.