: Legitimate system files usually reside in C:\Windows\System32 . If the file is in a temporary folder ( %TEMP% ) or a random user directory, it is likely malicious.
: Avoid using third-party tools to suppress UAC warnings for this file, as this can allow malicious code to run with administrative privileges. I accidentally downloaded a .exe virus file - Microsoft Q&A uVACUNKNOWNr.exe
: Use Microsoft Autoruns to see if the file is configured to start automatically with Windows and disable it if necessary. uVACUNKNOWNr.exe