While the WinRAR software itself might be legitimate, the "Key.exe" bundled with it is almost certainly malicious. Technical Breakdown of the Name
The presence of or an executable file format ( .exe ) for a license key is a major red flag. WinRAR.v6.00.FINAL.ES.x86.x64.Incl.KEY.exe
Genuine WinRAR license keys are provided as a small file named rarreg.key , not as an executable program. While the WinRAR software itself might be legitimate,