Squirrel Update.exe

[Divina Milliken]

Youcannot debug squirrel UpdateManager - but there is one way: you can first install your app released by squirrel on you computer and then copy Update.exe (from %LocalAppData%/YourAppName/) to parent directory of yours binary files in project. (ProjectName/Bin/Debug or ProjectName/Bin/Release).

Hi! Sorry when I got home last night squirrel was no longer being flagged, however Update.exe is now. Totally my miss on which file you asked for, I've included it below just in case you still want it.

The above binary will go to url and look for RELEASES file, download and install the nuget package. squirrel.exe --update [url to package] Use caseDownload and execute binary Privileges requiredUse...

Squirrel is an installation and update framework for Windows desktop apps. It is used by many applications (e.g. slack) and as a result can be found on many systems. Like other installers I describ...

Detects the usage of the "Squirrel.exe" binary as a LOLBIN. This binary is part of multiple software installations (Slack, Teams, Discord, etc.). This rule is adapted from _creation/proc_creation_win_lolbin_squirrel.yml

Persistence consists of techniques that adversaries use to keep access to systems across restarts, changed credentials, and other interruptions that could cut off their access. Techniques used for persistence include any access, action, or configuration changes that let them maintain their foothold on systems, such as replacing or hijacking legitimate code or adding startup code.

Also, when I try to open other installed apps like Discord from their shortcut in desktop or from main menu they dont open. I checked that the shortcut was for update.exe file and that file doesnt open even if I try to start from there but when I try to open application named app and Discord they both work

If you are a web developer, you would be amazed by the possibilities that a desktop application offers.

Just give a look at the applications listed on electron website to have a quick glance of the infinite opportunities offered by such a technology.

Few key features:

This little open-source framework aims to simplify installers for desktop softwares.

When correctly set up, it enables your application to watch for new releases deployed on a server and to automatically update itself from the downloaded files.

This sounds great, but when I recently tried to implement this feature for a Windows application, I had a hard time to understand how every pieces fit together.

I will give you a quick glance of what I learned doing this, and explain how the update loop of a Squirrel application works.

The framework also works on Mac but the server implementation is slightly different:

To use Squirrel for Mac with Electron, check this article which helped me a lot when implementing the feature.

This script will read the option of the squirrel event when launching your application, giving you the ability to execute scripts at specific moments of the installation.

In this case, it will restart the application when installing it, updating it or uninstalling it.

You can as well do thing like add an shortcut icon on desktop when installing the application and remove it when uninstalling (check this documentation).

Very simply, you can now distribute your application to your users with the Setup.exe file.

Go to :3333/Setup.exe, this will download the Setup.exe file which will install MyAwesomeApp wrapped with Squirrel on your computer.

Run the Setup.exe file, and the application should be installed in C:\Users\Me\AppData\MyAwesomeApp\.

To run it, launch the MyAwesome.exe file.

You can as well create a shortcut on your desktop for later use.

Open now your application: you can use the shortcut that you have created earlier or go to C:\Users\Me\AppData\MyAwesomeApp\.

Wait for around 20sec, and your app should reload and you will see your new wonderful feature appears!

You now know pretty everything about the Squirrel.Windows framework!

To dive deeper into the possibilities that it offers, open a terminal on Windows and run ./Update.exe into your project folder to display available documentation.

You .nupkg file should contain a single lib folder with a net45 folder inside. .Net 4.5 is a requirement for Squirrel, but it is not restrained to only be used with .Net 4.5 projects. Actually, you can use Squirrel to distribute and install any sort of desktop application on Windows and Mac.

Then inside your net45 folder you put the content you want to install. For .Net projects, this is often the output of a Release build. You can remove all IDE related files and debugging symbols, such as .pdb, .vshost etc. Set the appropriate metadata on the .nupkg file. The icon will be used on the application, and the package summary will be used as Name in the Programs and Features list.

This means that Squirrel wraps it into a folder, a Releases folder per default, next to the .nupkg file. The Squirrel.exe is part of the squirrel.windows NuGet package. This means that an easy way to access it, is through the NuGet Package Manager Console in Visual Studio. Squirrel.exe comes with a number of command line options, which are worth looking into.

Inside the Releases folder is the .nupkg file, a Setup.exe, a Setup.msi, and a RELEASES file. The two Setup files are used for installation. The RELEASES file contains information, a SHA, name, and size of the releases in the folder.

You can copy the content of the Releases folder to a local path, a Dropbox folder, Amazon S3, Azure Blob Storage, Microsoft IIS, etc. There are no requirements what so ever. You can even change the path or url and move the installation files. If you wanna use the background updating mechanism, you just have to update the path or url in your application.

As with Easy-Mode it is good practice to put the UpdateManager into a using statement. It is required that the UpdateManager is disposed prior to application termination. You can either handle this manually or use a using statement.

For development / internal use, creating installers without a signature is okay, but for a production app you need to sign your application. Internet Explorer's SmartScreen filter will block your app from being downloaded, and many anti-virus vendors will consider your app as malware unless you obtain a valid cert.

Any certificate valid for "Authenticode Code Signing" will work here, but if you get the right kind of code certificate, you can also opt-in to Windows Error Reporting. This MSDN page has the latest links on where to get a WER-compatible certificate. The "Standard Code Signing" certificate is sufficient for this purpose.

Notice that the first time the installer launches your app, your app will see a --squirrel-firstrun flag. This allows you to do things like showing up a splash screen or presenting a settings UI. Another thing to be aware of is that, since the app is spawned by squirrel and squirrel acquires a file lock during installation, you won't be able to successfully check for app updates till a few seconds later when squirrel releases the lock.

Modern: By passing a windowsSign option, which will be passed to @electron/windows-sign. This method allows full customization of the code-signing process - and supports more complicated scenarios like cloud-hosted EV certificates, custom sign pipelines, and per-file overrides. It also supports all existing "simple" codesigning scenarios, including just passing a certificate file and password. Please see @electron/windows-sign for all possible configuration options.

Legacy: By passing the top-level settings (certificateFile, certificatePassword, and signWithParams). For simple codesigning scenarios, there's no reason not to use this method - it'll work just as fine as the modern method.

The genuine Update.exe file is a software component of Microsoft Windows Operating System by Microsoft Corporation.

Microsoft Windows does use "update.exe" as a process name, for its Package Installer, (formerly Service Pack Setup), which applies system patches and updates downloaded from Microsoft Update or Windows Update servers, but the name is widely used by other legitimate software products and for disguise by malware. It is downloaded within a Windows self-unpacking executable (".exe") cabinet file. By default it runs from the temporary folder into which this file unpacks itself, ("C:\\updates\update.exe"). If located in the system root folder or in "C:\Windows" or its subfolders, it is at least 50% dangerous. The features controlled by command-line parameters inherited from the parent cabinet file's execution, and the parameters it accepts, depend on the version used when packaging the update. The version of "update.exe" that runs when installing one update or system patch may differ from that supplied inside another. Some updates install using "hotfix.exe" or the Windows Installer ("msiexec.exe").

3a8082e126