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I have purchased a Standard Code Signing certificate from Digicert and I do not understand why my executable, although signed with a certificate from a trusted CA is displayed as Unknown Publisher by Windows Defender SmartScreen.

Screenshot of file properties showing that although signed, executable does not show Publisher name on Windows Defender SmartScreen

If I disable "Check applications and files" in "Control applications and browser" of the "Windows Defender Security Center" of Windows 10, my editor name appears correctly in the "Open File - Warning security"

**Open File - Warning security** window shows correct publisher name

So, I'd really like to understand why the SmartScreen filter in Windows Defender still says Unknown Publisher.

I understand that the SmartScreen filter is based on a reputation system and I do not question the actual display of the warning message (as my Code Signing certificate is not an EV one) but the fact that the name of the publisher is indicated as Unknown Publisher, whereas a valid signature is present.

Any idea about that? I am code signing wrongly the executable?

  • 1
    Your certificate meets all requirements for Microsoft code signing, correct? – Ramhound Oct 14 '17 at 13:28
  • Yes, sure, it meets requirements ;) – jtraulle Oct 14 '17 at 18:54
  • Did you find the cause of this? Same issue here. It actually worked for a few days right after signing. Then at some point SmartScreen decided to display "Unknown Publisher", while a UAC prompt right after clicking "Run Anyway" actually shows it as "Verified publisher: XYZ"... – JimmiTh Dec 5 '17 at 11:02
  • Unfortunately, I did not find the cause of this :( Tried contacting Microsoft through Uservoice, MSDN forums, Technet forums, twitter. No one provide me assistance and my certificate authority neither (Digicert). Still unsolved on my side :( – jtraulle Dec 6 '17 at 12:11
  • @JimmiTh See this related thread on technet social.technet.microsoft.com/Forums/windows/en-US/… and on MSDN social.msdn.microsoft.com/Forums/windowsdesktop/en-US/… – jtraulle Dec 6 '17 at 12:25

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