meow is an on-the-fly PatchGuard disabler for Windows 8.1 and RT which does not depends on magic values specific to build versions.

A related blog entry can be found here:

http://standa-note.blogspot.ca/2015/10/some-tips-to-analyze-patchguard.html

If you are targeting Windows 7 or older, you can use DisPG instead.

This program will not going to work as expected forever since PatchGuard is a moving target and may not be perfect even now.

Get an archive file for compiled files form this link:

https://github.com/tandasat/meow/releases/latest

On the x64 platform, you have to enable test signing to install the driver. To do that, open the command prompt with the administrator privilege and type the following command, and then restart the system to activate the change:

bcdedit /set {current} testsigning on

On the ARM platform (ig, Windows RT), you may have to exploit CVE-2015-2552 (ms15-111) in order to enable test signing since the above command is not allowed. For more details on the vulnerability, see the Bugtraq report [Windows 8+ - Trusted Boot Security Feature Bypass Vulnerability] (http://seclists.org/bugtraq/2015/Oct/70)

To install the driver, extract the archive file and make sure that internet connection is available since this program needs to download symbol files unless your system already has right symbol files.

Then, run install.bat with the administrator privilege. It installs and starts the driver, launches PowerShell for displaying log and a support program meow_client.exe to install hooks and deactivate PatchGuard.

It is advised to keep meow.sys running to make sure that PatchGuard is completely disabled otherwise PatchGuard may detect your modification if you uninstall meow before all of PatchGuard contexts are detected and dropped. If you are not going to install your own patches, it is fine to stop and uninstall meow because meow does not leave any changes in the kernel if it is unloaded.

To stop and uninstall the driver, execute uninstall.bat with the administrator privilege.

Once you started and disabled PatchGuard, you are free to install your own tools using hooks. RemoteWriteMonitor is an example of this type of tools.

To download full source code, clone it with --recursive:

git clone --recursive https://github.com/tandasat/meow.git

At the first time of build with Visual Studio, you will be prompted for a password of the certificate. The password is 'password' (without quotes).

• Windows 8.1 (x64/ARM)

This software is released under the MIT License, see LICENSE.