Token Privileges of TrustedInstaller.exe process Notice that the token user is NT AUTHORITY\SYSTEM, and we have the NT AUTHORITY\TrustedInstaller group associated with it. We can explore the token associated with the executable by starting the service manually and looking at it in Process Hacker. TrustedInstaller is a Service Account, meaning the service must be running when files owned by it are modified, and only the TrustedInstaller.exe can modify them. This is accomplished by assigning ownership of system files to the TrustedInstaller account, which means that even an administrator cannot make changes to these files without first taking ownership of them. TrustedInstaller ensures that important system files are not tampered with or modified by unauthorized users. It is responsible for managing system files, installing and uninstalling applications, and performing critical system updates. Introduced in Windows Vista, TrustedInstaller is a built-in service account in the Windows operating system with the highest permissions. TrustedInstaller ownership on Windows Defender Directory Looking at the Security Properties of the folder, it turns out we don't own the Windows Defender folder on our Computer. Let’s delve deeper into the nuisance known as TrustedInstaller.Īccess Denied on Deleting Windows Defender directory Enter TrustedInstaller However, we received an " Access Denied" message even when we were logged in as an Administrator. We attempt to delete or rename the C:\Program Files\Windows Defender folder. Taking it a step further, how about deleting the Defender executable all together? Therefore, disabling the service or modifying the configuration won’t work. Changing settings through PowerShell cmdlets on your device.Configuring settings in Registry Editor on your Windows device.How would one do that? When most organisations use Tamper Protection.Īccording to Microsoft, Tamper protection essentially locks Microsoft Defender Antivirus to its secure default values and prevents your security settings from being changed through apps and methods such as: How would you suppress alerts from an EDR?
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