Archives
/
defender-control
mirror of https://github.com/qtkite/defender-control
2
0
Fork 0
Code Issues Projects Releases Wiki Activity
An open-source windows defender manager. Now you can disable windows defender permanently.
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
128 Commits
2 Branches
8 Tags
58 MiB
C++ 76.7%
C 23.3%
 
 
main
gui
1.0.0
v1.0
v1.0.0
v1.1
v1.2
v1.3
v1.4
v1.5
Branches Tags
${ item.name }
Create tag ${ searchTerm }
Create branch ${ searchTerm }
from '545b41a92b'
${ noResults }
Go to file
qtkite 545b41a92b Disables defender!!! 3 years ago
resources demo 3 years ago
src Disables defender!!! 3 years ago
.gitignore com class 3 years ago
LICENSE com class 3 years ago
README.md Update README.md 3 years ago
logs.MD com class 3 years ago

README.md

Defender Control

Open source windows defender disabler.
Now you can disable windows defender permanently!

What is this project?

We all know that disabling windefender is a pain going through countless registries & running endless powershell commands.
The next easiest solution is to use freeware and currently the most popular one is by sordum.
But I like open source, so I made a safe to use open source defender control.

Demo

Demo

TODO

  • Delete windefend as trusted installer
  • Remove startup as boot

Reversal

I reversed parts of the freeware with some hooks & x64 debugger, here are some of my findings

x64 Debug

disabling defender

008CE9E8  043DCA88  L"HKLM64"
...
008CEA08  043DCBC0  L"SOFTWARE\\Policies\\Microsoft\\Windows Defender"

008CE8F0  043DCFE8  L"HKLM64"
...
008CE910  043DD120  L"SYSTEM\\CurrentControlSet\\Services\\WinDefend"

76122F7F | 397D 0C                  | cmp dword ptr ss:[ebp+C],edi            | [ebp+C]:L"Start"`

https://answers.microsoft.com/en-us/protect/forum/protect_defender-protect_start-windows_10/how-to-disable-windows-defender-in-windows-10/b834d36e-6da8-42a8-85f6-da9a520f05f2

76122FF0 | 8945 CC                  | mov dword ptr ss:[ebp-34],eax           | [ebp-34]:L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\StartupApproved\\Run"
76122FF3 | 66:8B01                  | mov ax,word ptr ds:[ecx]                | ecx:&L"SecurityHealth"

EDX : 043DCD78     L"SOFTWARE\\Microsoft\\Windows Defender\\Real-Time Protection"
EIP : 7591E420     <advapi32.RegCreateKeyExW>

We have 2 flags set:
DisableRealtimeMonitoring as a REG_DWORD set to 0x01
DpaDisabled as REG_DWORD set to 0x0

008CEFF8  043EB4C8  L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\StartupApproved\\Run"

enabling defender

there seems to be a reference with "Policy Manager" using RegEnumKeyExW

It seems to call RegDeleteValueW on security health (see above)

reversing w hooks

We are going to write a simple dll to inject into defender control to dump out the parameters of the functions we are interested in.

Here are the logs:

obtained RegDeleteKeyW from 75A60000
obtained RegDeleteValueW from 75A60000
obtained RegEnumValueW from 75A60000
obtained RegSetValueExW from 75A60000
obtained RegCreateKeyExW from 75A60000
obtained RegConnectRegistryW from 75A60000
obtained RegEnumKeyExW from 75A60000
obtained RegQueryValueExW from 75A60000
obtained RegOpenKeyExW from 75A60000
imports resolved
preparing to hook

Registry Routine to check if defender activated:

[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
[RegQueryValueExW]
lpValueName: C:\Program Files (x86)\DefenderControl\dControl.exe

Routine to disable defender

[RegCreateKeyExW]
lpSubKey: SOFTWARE\Policies\Microsoft\Windows Defender
[RegSetValueExW]
lpValueName: DisableAntiSpyware
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows Defender
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegCreateKeyExW]
lpSubKey: SYSTEM\CurrentControlSet\Services\WinDefend
[RegSetValueExW]
lpValueName: Start
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegQueryValueExW]
lpValueName: SecurityHealth
[RegQueryValueExW]
lpValueName: SecurityHealth
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run
[RegSetValueExW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegEnumValueW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
[RegQueryValueExW]
lpValueName: C:\Program Files (x86)\DefenderControl\dControl.exe

Routine to enable defender

[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: Policy Manager
[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegOpenKeyExW]
lpValueName: SYSTEM\CurrentControlSet\Services\SecLogon
[RegQueryValueExW]
lpValueName: Start
[RegQueryValueExW]
lpValueName: Start
[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: Policy Manager
[RegOpenKeyExW]
lpValueName: SOFTWARE\Policies\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: Policy Manager
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender
[RegQueryValueExW]
lpValueName: DisableAntiSpyware
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegEnumValueW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegQueryValueExW]
lpValueName: SecurityHealth
[RegQueryValueExW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run
[RegDeleteValueW]
lpValueNameSecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegEnumValueW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegQueryValueExW]
lpValueName: WindowsDefender
[RegQueryValueExW]
lpValueName: WindowsDefender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegEnumValueW]
lpValueName: WindowsDefender
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths
[RegQueryValueExW]
lpValueName: C:\Program Files (x86)\DefenderControl\dControl.exe
<also redacted a bunch of stuff from policy manager stuff>
-----
SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
DisableRealtimeMonitoring

When it disables the AV it modifies these registries:

[RegCreateKeyExW]
lpSubKey: SOFTWARE\Policies\Microsoft\Windows Defender
[RegSetValueExW]
lpValueName: DisableAntiSpyware
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows Defender
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegCreateKeyExW]
lpSubKey: SYSTEM\CurrentControlSet\Services\WinDefend
[RegSetValueExW]
lpValueName: Start
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegQueryValueExW]
lpValueName: SecurityHealth
[RegCreateKeyExW]
lpSubKey: SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run
[RegSetValueExW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows\CurrentVersion\Run
[RegEnumValueW]
lpValueName: SecurityHealth
[RegOpenKeyExW]
lpValueName: SOFTWARE\Microsoft\Windows Defender\Real-Time Protection
[RegQueryValueExW]
lpValueName: DisableRealtimeMonitoring

Dumping VTable Calls

[Control Table] 0x495b78
[Control Table] 0x493658
[Control Table] 0x4932f8
[Control Table] 0x494e1c
[Control Table] 0x4949e4
[Control Table] 0x4965e0
[Control Table] 0x496088
[Control Table] 0x4951c4
[Control Table] 0x4960d0
[Control Table] 0x49463c
[Control Table] 0x493808
[Control Table] 0x493850
[Control Table] 0x494ed0
[Control Table] 0x49382c
[Control Table] 0x49532c
[Control Table] 0x493874
[Control Table] 0x493898
[Control Table] 0x4931fc
[Control Table] 0x4931b4
[Control Table] 0x495500
[Control Table] 0x495cbc
[Control Table] 0x495ce0
[Control Table] 0x4958cc
[Control Table] 0x494a74
[Control Table] 0x495c08
[Control Table] 0x494cfc
[Control Table] 0x493c40
[Control Table] 0x493e5c
[Control Table] 0x493ea4
[Control Table] 0x493b8c
[Control Table] 0x495b0c
[Control Table] 0x495c2c
[Control Table] 0x493f7c
[Control Table] 0x4930dc
[Control Table] 0x493fe8
[Control Table] 0x494c00
[Control Table] 0x495644
[Control Table] 0x495428
[Control Table] 0x496430
[Control Table] 0x4963e8
[Control Table] 0x4954b8
[Control Table] 0x4945d0
[Control Table] 0x496040
[Control Table] 0x4960ac
[Control Table] 0x494a50
[Control Table] 0x495be4

Upon starting the AV, the program calls CreateProcessW on C:\Windows\System32\SecurityHealthSystray.exe

Windows File Protection

But theres, a catch. In a newer recent windows update - you can no longer disable the defender via registries without elevated permissions.
Well, our program runs completely in usermode, so there must be another way its making these registry changes - most likely through the powershell command Set-MpPreference if we do some research into changing the registry. So we will need to take a peek into the wmic api it accesses.

Luckily for us, all this stuff is documented. Check out these two links:

I first wanted to see how powershell called the command, so i looked through the powershell github since its open sourced and found that the command was in a cmdlet that was not documented in the repository. So after reading up on some powershell commands I dumped the powershell informating using this:

Get-Command Set-MpPreference | fl

If we wanted to read the MSFT_MpPreference class, it is documented here: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/legacy/dn455323(v=vs.85)#requirements
We can access via powershell like so:

Get-WmiObject -ClassName MSFT_MpPreference -Namespace root/microsoft/windows/defender

If we look further we can write to this using the WMI - it is documented here: https://docs.microsoft.com/en-us/previous-versions/windows/desktop/defender/windows-defender-wmiv2-apis-portal

We can find the specific wmi com classes if we do the following command:

MpPreference |fl *

We get an output and we are intrested in this:

CimClass                                      : root/Microsoft/Windows/Defender:MSFT_MpPreference
CimInstanceProperties                         : {AllowDatagramProcessingOnWinServer, AllowNetworkProtectionDownLevel,
                                                AllowNetworkProtectionOnWinServer,
                                                AttackSurfaceReductionOnlyExclusions...}
CimSystemProperties                           : Microsoft.Management.Infrastructure.CimSystemProperties

We can find the class here: https://docs.microsoft.com/en-us/dotnet/api/microsoft.management.infrastructure.cimsystemproperties?view=powershellsdk-7.0.0

It is also located in windows binaries in the following path: C:\Program Files (x86)\Reference Assemblies\Microsoft\WMI\v1.0