Files with "Extractor" or "Pass" in the name are often themed as legitimate Open Source Intelligence (OSINT) or credential-checking tools to reduce user suspicion while delivering RATs (Remote Access Trojans) like Quasar RAT or RomCom . Malware Behavior & Persistence
: The malware executes automatically upon the next system login without requiring administrative privileges. LinkUserPassExtractor.rar
: Once active, the payload (often a obfuscated Batch or PowerShell script) connects to a remote server to download additional malware, such as info-stealers or backdoors. Recommended Actions Files with "Extractor" or "Pass" in the name
Recent campaigns have used specially crafted RAR files to bypass the user's intended extraction folder. If extracted with a vulnerable version of WinRAR (7.12 or earlier), the archive can silently write malicious files—such as .bat , .lnk , or .exe files—directly into the Windows Startup directory or %TEMP% folders. Archives like "LinkUserPassExtractor
: Upon extraction, a hidden malicious file is placed in C:\Users\[User]\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup .
Archives like "LinkUserPassExtractor.rar" are frequently weaponized using known vulnerabilities in WinRAR to achieve silent execution: