Disable AzureAD Security Defaults – MFA

Disable AzureAD Security Defaults – MFA

Microsoft recently turned on security defaults for M365 Tenants forcing MFA for users.

You can check by going into Azure AD > Properties > Manage Security defaults

M365 tenancy

 

If defaults are set to “Yes” that is the reason MFA turned on. You should be able to set that to NO to remove the “new” defaults and turn MFA off. – However it is highly recommended to use MFA for all accounts.

disable security defaults

 

 

 

Create Group Policy to Whitelist Applications

Create Group Policy to Whitelist Applications

Create Group Policy to Whitelist Applications – Ransomware prevention

 

Recommended to test Whitelisting in a test environment before deploying in production environment. Purpose is to Block Ransomware, Block Java Updates You will need to manually add Whitelist entries for each new Java Update you wish to install

Go to https://java.com/en/download/

Take note of the latest Java Version (eg, 8u301)

Login to your to a server that can Access/Create/Edit Group Policy objects

Open the run command, type in gpmc.msc – Click OK

 

Right click on the Organizational Unit you wish add the Whitelist to, Select the first option.

(Create GPO)

Enter a name for the Whitelist, Click OK (i.e CryptoLocker/Ransomware Prevention)

Link the newly create GPO to any other Organizational Units you want to be added to the GPO.

(eg. Right click on Computers OU, ‘select Link an Existing GPO…’ then select the new GPO)

Right click on the GPO, click Edit…

Drill down in; Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Software Restriction Policies

Right click on Software Restriction Policies, Select the first option

Right click on Additional Rules, Select New Path Rule…

Enter the following path: %localAppData%\*\*.exe

Security Level = Disallowed

Click OK

Create Additional Path Rules for the following paths:

%localAppData%\*.exe

%AppData%\*.exe

%AppData%\*\*.exe

%Temp%\*.zip\*.exe

%Temp%\7z*\*.exe

%Temp%\Rar*\*.exe

%Temp%\wz*\*.exe

Your list should look like this:

Exit out of Group Policy Editor.

Create another GPO called Cryptolocker/Ransomware – Whitelist Allow (Link to same OU’s as previous GPO)

Right click on the GPO, click Edit…

Drill down in; – Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Software Restriction Policies

Right click on Software Restriction Policies, Select the first option

Right click on Additional Rules, Select New Path Rule…

Under ‘Path:’ enter the path of the Java Installer you wish to allow:

%localappData%\temp\jre-8u301-windows-i586-iftw.exe

 

Depending on which version of Java you are updating, replace ‘8u91’ with the version you want to allow.

Set Security Level to ‘Unrestricted’

Enter an appropriate description name.

Click OK.

Verify that new Path Rule has been added to Whitelist.

Close GPO Editor.

Refresh Group policy Management

Go down to the Whitelisting Çryptolocker/Ransomware – Whitelist Allow GPO, click on it once

In the window on the right select ‘Settings’ from the tabs.

Drill down to; Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Software Restriction Policies/Additional Rules

Verify that new Path rule is shown in Policy List.

Exit Group Policy Management.

 

Go to a machine what is linked to the GPO to test whitelist.

Run Java Updater/Installer

Note the successful installation of Java

If fails = Perform forced Update to GPO

From Administrative Command Prompt,

gpupdate /force

 

 

Enable Auditing on Windows Folders/Files

Enable Auditing on Windows Folders/Files

Audit all access to folders and/or files on a server or workstation.

Log onto the server/workstation that you wish to enable auditing on.

Open Local Group Policy Editor.

CTRL + R

gpedit.msc

Browse to the following location: – Computer Configuration > Windows Settings > Security Settings > Local Policies > Audit Policy

Double click ‘Audit object access’

Select Success and Failure

Click Apply then OK

Exit Local Group Policy Editor

 

Navigate to the folder/file you wish to track permission changes.

Right click the folder/file then select Properties.

Select the Security tab then select Advanced

Select the Auditing tab then select Continue (if prompted)

Click Add

Click Select a principal

Type ‘everyone’ then select Check Names. – Click OK

Set the Type: to All

Untick the default auditing permissions and only select ‘Change permissions’ – Click OK

Click OK Twice more.

Open up cmd or powershell as ADMIN

Execute the command: gpupdate /force

Auditing is now implemented on the specific folders/files.

 

To check audit logs open Event Viewer.

Select the Security Logs

Filter the logs based on Event ID 4670