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hi this is paula jay-ar from secure delivering another episode of secure hacks weekly day's episode is very cool because today it's going to be delivered by Greg I would try to show how to sign a code how to get a certificate first because it may be a commercial certificate or it may be your own certificate there's nothing wrong with your own certificate what will happen with your signed code if your certificate expires it's also pretty interesting copying so we try to get the certificate sign a code verify those signatures and show how do they work and and what we can do about it okay so let's get started okay so I have my virtual machine up and running and on the desktop I have my early cash utility utility written for some forensic purposes and this utility is not digitally signed it was written a long time ago you cancel you can see there is no digital signature over here and interesting fact here is it not written as you can swap by the icon in any of Microsoft development environments and still can be perfectly well signed without any problem to have a digital signature first we have to have a certificate for used for signing it can be any certificate with the proper purpose for example I can run a PowerShell and then issue a command new self signed certificate with the proper q-switch and then third sign and so on and so on but such certificate will be next to be useless because it will be only trusted by myself so well it will verify if the file was not altered and how but only by yourself so is not the best approach if you are finding a file for internal usage like your own company utilities and so on you can use CA your own certificate authority for this purpose to do this you have to manage templates I will switch to a certificate authority over here I will launch my certificate authority console and under certificate templates by default there is no template about code filing it will load in a second it has to be loaded from active directory and now I can click right click manage go to the templates and select code signing template duplicate it and apply my own name CQ signing and go through other properties to verify how I can issue a certificate based on this template if all those properties are acceptable for me of course I can click OK and I have this secure signing template being present if I return to the certificate authority console I can click new certificate template to issue and I can select secure signing for consigning purposes click OK and now my certificate authority will issue certificates with the purpose of signing if I return right now to my machine with that executable file for being signed I can exit from PowerShell go-to certificate management third...