Did you just stumble upon a file that is digitally signed by ProtonVPN AG? If so, please read on.
You will typically notice ProtonVPN AG when running the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the ProtonVPN AG digital signature with the following procedure:
Here is a screenshot of a file that has been digitally signed by ProtonVPN AG:

As you can see in the screenshot above, the Windows OS reports that "This digital signature is OK". This means that the file has been published by ProtonVPN AG and that no one has tampered with the file.
If you click the View Certificate button shown in the screencap above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also view the address for ProtonVPN AG, such as the street name, city and country.
GlobalSign CodeSigning CA - SHA256 - G3 has issued the ProtonVPN AG certificates. You can also examine the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the ProtonVPN AG files I have gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 1/65 | protonvpnservice.exe |
| 0/68 | protonvpnservice.exe |
| 0/70 | ProtonVPNService.exe |
Here's the detection names for the ProtonVPN AG files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| Tencent | Suspicious.Heuristic.Gen.b.0 |
The detection percentage is based on that I have collected 203 scan reports for the ProtonVPN AG files. 1 of these scan reports came up with some sort of detection. You can view the full details of the scan results by examining the files listed above.
The analysis is done on certificates with the following serial numbers: