Used ImposterExec for Windows?
Developer’s Description
This program was written to scan your computer for potential malicious executable files (e.g. C:\Windows\rundll32.dll.exe). *Notice the ".dll.exe" in the file.* If your computer's settings hide known file extensions, then the file would only show up as "C:\Windows\rundll32.dll". This can easily be mistaken for a system file. Using this program will help you determine which files are potentially a threat.
Used ImposterExec for Windows?
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