Harden-Windows-Security

Harden Windows Safely, Securely using Official Supported Microsoft methods and proper explanation | Always up-to-date and works with the latest build of Windows | Provides tools and Guides for Personal, Enterprise, Government and Military security levels | Read The Rationale https://github.com/HotCakeX/Harden-Windows-Security/blob/main/Rationale.md

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Ecosystems: PowerShell, Windows

Harden Windows Security | A New Threat to Malware

Harden Windows Safely, Securely, Only With Official Microsoft Methods

[!IMPORTANT] Click/Tap on Each of the Items Below to Access Them on This GitHub Repository

Windows Defender Application Control Resources

The WDACConfig Module for Windows Defender Application Control

Read the Rationale Behind This GitHub Repository

[!NOTE] Windows by default is secure and safe, this repository does not imply nor claim otherwise. Just like anything, you have to use it wisely and don't compromise yourself with reckless behavior and bad user configuration; Nothing is foolproof. This repository only uses the tools and features that have already been implemented by Microsoft in Windows OS to fine-tune it towards the highest security and locked-down state, using well-documented, supported, recommended and official methods. Continue reading for comprehensive info.

How To UseHowToUseIcon

Start The Harden Windows Security Using GUI (Graphical User Interface) 

(irm 'https://raw.githubusercontent.com/HotCakeX/Harden-Windows-Security/main/Harden-Windows-Security.ps1')+'P'|iex

Install the Harden Windows Security Module from PowerShell Gallery

Check the documentation and How to use

Click/Tap here for commands

Install-Module -Name 'Harden-Windows-Security-Module' -Force

Protect-WindowsSecurity -GUI

Confirm-SystemCompliance

Unprotect-WindowsSecurity

Requirements RequirementsIcon

PowerShell (latest version), Install it from Microsoft Store or using Winget: Winget install Microsoft.PowerShell

Any device that meets the Windows 11 hardware and Virtualization Based Security requirements.

Virtualization technology and Secure Boot enabled in your UEFI settings. Official guide - How to enable Secure Boot on: HP - Lenovo - Dell.

No 3rd party AV installed.

Latest available version of Windows installed.

[!TIP] Restart your device after applying the hardening measures.

Features FeaturesIcon

Everything always stays up-to-date with the newest proactive security measures that are industry standards and scalable.

Everything is in clear text, nothing hidden, no 3rd party executable or pre-compiled binary is involved.

No Windows functionality is removed/disabled against Microsoft's recommendations.

All of the links and sources are from official Microsoft websites, straight from the source. No bias, No FUD, No misinformation and definitely No old obsolete methods. That's why there are no links to 3rd party news websites, forums, made up blogs/articles, and such.

Link Count Link Reason
1 Intel website i7 13700k product page
1 state.gov List of State Sponsors of Terrorism
1 orpa.princeton.edu OFAC Sanctioned Countries
2 Wikipedia TLS - providing additional information
1 UK Cyber Security Centre TLS - providing additional information
1 Security.Stackexchange Q&A TLS - providing additional information
1 browserleaks.com/tls TLS - Browser test
1 clienttest.ssllabs.com TLS - Browser test
1 scanigma.com/knowledge-base TLS - providing additional information
1 cloudflare.com/ssl/reference/ TLS - providing additional information
1 github.com/ssllabs/research/ TLS - providing additional information
1 Wayback Machine Providing additional information about Edge Browser

The module primarily uses Group policies, the Microsoft recommended way of configuring Windows. It also uses PowerShell cmdlets where Group Policies aren't available, and finally uses a few registry keys to configure security measures that can neither be configured using Group Policies nor PowerShell cmdlets. This is why the module doesn't break anything or cause unwanted behavior.

This Readme page lists all of the security measures applied by the module.

When a hardening measure is no longer necessary because it's applied by default by Microsoft on new builds of Windows, it will also be removed from the module in order to prevent any problems and because it won't be necessary anymore.

The module can be run infinite number of times, it's made in a way that it won't make any duplicate changes.

Applying these hardening measures makes your PC compliant with Microsoft Security Baselines and Secured-core PC specifications (provided that you use modern hardware that supports the latest Windows security features) - See what makes a Secured-core PC - Check Device Guard category for more info

Secured-core recommended for the most sensitive systems and industries like financial, healthcare, and government agencies. Builds on the previous layers and leverages advanced processor capabilities to provide protection from firmware attacks.

Since I originally created this repository for myself and people I care about, I always maintain it to the highest possible standard.

If you have multiple accounts on your device, you only need to apply the hardening measures 1 time with Admin privileges, that will make system-wide changes. Then you can optionally run the module, without Admin privileges, for each standard user to apply the Non-Admin category.

[!WARNING] For your own security, exercise caution when considering any other 3rd-party tools, programs, or scripts claiming to harden or modify Windows OS in any way. Verify their legitimacy thoroughly before use and after each release. Avoid blind trust in 3rd party Internet sources. Additionally, if they don't adhere to the rules mentioned above, they can cause system damage, unknown issues, and bugs.

Hardening CategoriesHardeningCategoriesIcon

From Top to bottom in order:

  • Commands that require Administrator Privileges (click/tap on each of these to see in-depth info)

    • Microsoft Security Baselines
    • Microsoft 365 Apps Security Baselines
    • Microsoft Defender
    • Attack surface reduction rules
    • Bitlocker Settings
    • Device Guard
    • TLS Security
    • Lock Screen
    • UAC (User Account Control)
    • Windows Firewall
    • Optional Windows Features
    • Windows Networking
    • Miscellaneous Configurations
    • Windows Update configurations
    • Edge Browser configurations
    • Certificate Checking Commands
    • Country IP Blocking
    • Downloads Defense Measures

  • Commands that don't require Administrator Privileges

    • Non-Admin Commands
Indicator Description
Security measure is applied using PowerShell cmdlets or Registry
Security measure is applied using Group Policies
CSP for the security measure
Sub-category - prompts for additional confirmation

Microsoft Security BaselinesMicrosoftSecurityBaseline

A security baseline is a group of Microsoft-recommended configuration settings that explains their security implications. These settings are based on feedback from Microsoft security engineering teams, product groups, partners, and customers.

Continue reading in the official documentation

Optional Overrides for Microsoft Security Baselines

Highly recommended to apply these overrides, the module will ask you whether you want to apply them or not. Use Optional Overrides when applying the hardening measures on Azure VMs.

Microsoft 365 Apps Security BaselinesMicrosoft365AppsSecurityBaselines

The security baseline for Microsoft 365 Apps for enterprise is published twice a year, usually in June and December.

More info in Microsoft Learn

Microsoft Security Baselines Version Matrix

Microsoft DefenderWindowsDefenderIcon

  • Extends the Cloud Security Scan time to the maximum amount of 60 seconds, by default it is 10 seconds. You need to be aware that this means actions like downloading and opening an unknown file will make Microsoft Defender send samples of it to the Cloud for more advanced analysis and it can take a maximum of 60 seconds from the time you try to open that unknown file to the time when it will be opened (if deemed safe). CSP

    • Here is an example of the notification you will see in Windows 11 if that happens.
  • Configures the Cloud Block/Protection Level to the maximum level of Zero Tolerance and Block At First Sight. No unknown file can run on your system without first being recognized by the Microsoft's Security Graph and other globally omniscient systems. CSP
  • Configures the Microsoft Defender to send all samples automatically. Increasing protection by participating in the SpyNet / MAPS network. CSP
  • Sets the SpyNet membership to Advanced, improving Cloud Protection. CSP
  • Enables file hash computation; designed to allow admins to force the anti-malware solution to "compute file hashes for every executable file that is scanned if it wasn't previously computed" to "improve blocking for custom indicators in Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP). CSP
  • Clears Quarantined items after 1 day instead of the default behavior of keeping them indefinitely. CSP
  • Allows Microsoft Defender to download security updates even on a metered connection. CSP
  • Enables Microsoft Defender to scan mapped network drives during full scan. CSP
  • Enables Microsoft Defender to scan emails. The engine will parse the mailbox and mail files. CSP
  • Enables Microsoft Defender to scan Removable Drives. CSP
  • Forces Microsoft Defender to check for new virus and spyware definitions before it runs a scan. CSP
  • Makes Microsoft Defender run catch-up scans for scheduled quick scans. A computer can miss a scheduled scan, usually because the computer is off at the scheduled time, but now after the computer misses two scheduled quick scans, Microsoft Defender runs a catch-up scan the next time someone logs onto the computer. CSP
  • Makes sure Async Inspection for Network protection of Microsoft Defender is turned on - Network protection now has a performance optimization that allows Block mode to start asynchronously inspecting long connections after they're validated and allowed by SmartScreen, which might provide a potential reduction in the cost that inspection has on bandwidth and can also help with app compatibility problems. CSP

  • Enables Smart App Control (if it's in Evaluation mode): adds significant protection from new and emerging threats by blocking apps that are malicious or untrusted. Smart App Control also helps to block potentially unwanted apps, which are apps that may cause your device to run slowly, display unexpected ads, offer extra software you didn't want, or do other things you don't expect.

    • Smart App Control is User-Mode (and enforces Kernel-Mode) Windows Defender Application Control policy (WDAC), more info in the Wiki. You can see its status in System Information and enable it manually from Microsoft Defender app's GUI. It is very important for Windows and Windows Defender intelligence updates to be always up-to-date in order for Smart App Control to work properly as it relies on live intelligence and definition data from the cloud and other sources to make a Smart decision about programs and files it encounters.

    • Smart App Control uses ISG (Intelligent Security Graph). The ISG isn't a "list" of apps. Rather, it uses the same vast security intelligence and machine learning analytics that power Microsoft Defender SmartScreen and Microsoft Defender Antivirus to help classify applications as having "known good", "known bad", or "unknown" reputation. This cloud-based AI is based on trillions of signals collected from Windows endpoints and other data sources and processed every 24 hours. As a result, the decision from the cloud can change.

    • Smart App Control can block a program entirely from running or only some parts of it in which case your app or program will continue working just fine most of the time. It's improved a lot since it was introduced, and it continues doing so. Consider turning it on after clean installing a new OS and fully updating it.

    • Smart App Control enforces the Microsoft Recommended Driver Block rules and the Microsoft Recommended Block Rules

    • Once you turn Smart App Control off, it can't be turned on without resetting or reinstalling Windows.

  • Enables Controlled Folder Access. It helps protect your valuable data from malicious apps and threats, such as ransomware. Controlled folder access protects your data by checking apps against a list of known, trusted apps. Due to the recent wave of global ransomware attacks, it is important to use this feature to protect your valuables files, specially OneDrive folders. CSP

    • If it blocks a program from accessing one of your folders it protects, and you absolutely trust that program, then you can add it to exclusion list using Microsoft Defender GUI or PowerShell. you can also query the list of allowed apps using PowerShell (commands below). with these commands, you can backup your personalized list of allowed apps, that are relevant to your system, and restore them in case you clean install your Windows.

    • The root of the OneDrive folders of all the user accounts will be added to the protected folders list of Controlled Folder Access, to provide Ransomware protection for the entire OneDrive folder. CSP

    • # Add multiple programs to the exclusion list of Controlled Folder Access
Add-MpPreference -ControlledFolderAccessAllowedApplications 'C:\Program Files\App\app.exe','C:\Program Files\App2\app2.exe'

    • # Get the list of all allowed apps
(Get-MpPreference).ControlledFolderAccessAllowedApplications

  • Enables Mandatory ASLR, It might cause compatibility issues only for some poorly-made 3rd party programs, specially portable ones. CSP

    • Automatically detects and excludes the Git executables of GitHub Desktop and Git (Standalone version) from mandatory ASLR if they are installed on the system. More info here

    • You can add Mandatory ASLR override for a trusted program using the PowerShell command below or in the Program Settings section of Exploit Protection in Microsoft Defender app.

      • Set-ProcessMitigation -Name "C:\TrustedApp.exe" -Disable ForceRelocateImages

  • Applies Exploit Protections/Process Mitigations from this list to the following programs: CSP

    • All channels of Microsoft Edge browser

    • Quick Assist app

    • Some System processes

    • Microsoft 365 apps

    • More apps and processes will be added to the list over time once they are properly validated to be fully compatible.

    • Exploit Protection configurations are also accessible in XML format within this repository. When implementing exploit protections using an XML file, the existing exploit mitigations will seamlessly integrate rather than being overwritten. Should there be pre-existing exploit protections applied to an executable on the system, and the XML file specifies different mitigations for the same executable, these protections will be merged and applied collectively.

  • Turns on Data Execution Prevention (DEP) for all applications, including 32-bit programs. By default, the output of BCDEdit /enum "{current}" (in PowerShell) for the NX bit is OptIn but this module sets it to AlwaysOn
  • Check for the latest virus and spyware security intelligence on startup. CSP
  • Specifies the maximum depth to scan archive files to the maximum possible value of 4,294,967,295 CSP
  • Enables notifying user of malicious and phishing scenarios in Microsoft Defender Enhanced Phishing Protection. CSP
  • Enables the feature in Enhanced Phishing Protection in Microsoft Defender SmartScreen that warns users if they reuse their work or school password. CSP
  • Enables warning users if they type their work or school passwords in unsafe apps. CSP
  • Enables automatic data collection (formerly known as Capture Threat Window) of Enhanced Phishing Protection in Microsoft Defender SmartScreen for security analysis from a suspicious website or app. CSP
  • Defines the number of days before spyware security intelligence is considered out of date to 2. The default is 7. CSP
  • Defines the number of days before virus security intelligence is considered out of date to 2. The default is 7. CSP
  • Sets the default action for Severe and High threat levels to Remove, for Medium and Low threat levels to Quarantine. CSP
  • Configures real-time protection and Security Intelligence Updates to be enabled during OOBE. CSP
  • Enables the Intel TDT (Intel Threat Detection Technology) integration with Microsoft Defender. CSP
  • Enables a network protection setting that blocks malicious network traffic instead of displaying a warning. CSP
  • Configures the Brute-Force Protection to use cloud aggregation to block IP addresses that are over 99% likely malicious CSP
  • Configures the Brute-Force Protection to detect and block attempts to forcibly sign in and initiate sessions CSP
  • Sets the internal feature logic to determine blocking time for the Brute-Force Protections CSP
  • Configures the Remote Encryption Protection to use cloud intel and context, and block when confidence level is above 90%. CSP
  • Configures the Remote Encryption Protection to detect and block attempts to replace local files with encrypted versions from another device CSP
  • Sets the internal feature logic to determine blocking time for the Remote Encryption Protection CSP
  • Extends the brute-force protection coverage in the Microsoft Defender Antivirus to block local network addresses. CSP
  • Enables ECS Configurations in the Microsoft Defender. They improve product health and security by automatically fixing any possible issues/bugs that may arise, in a timely manner.
  • Enables Network Protection to be configured into block or audit mode on Windows Server. CSP

[!TIP] Performance analyzer for Microsoft Defender Antivirus

Attack surface reduction rulesASRrulesIcon

Attack surface reduction rules target certain software behaviors, such as: CSP

  • Launching executable files and scripts that attempt to download or run files
  • Running obfuscated or otherwise suspicious scripts
  • Performing behaviors that apps don't usually initiate during normal day-to-day work

Such software behaviors are sometimes seen in legitimate applications. However, these behaviors are often considered risky because they are commonly abused by attackers through malware. Attack surface reduction rules can constrain software-based risky behaviors and help keep your organization safe.

Reducing your attack surface means protecting your devices and network, which leaves attackers with fewer ways to perform attacks. Configuring attack surface reduction rules in Windows can help!

[!TIP] all 19 available Attack Surface Reduction rules shown in the official chart will be enabled. The Harden Windows Security application also allows you to individually configure each Attack Surface Reduction rule.

Bitlocker SettingsBitlockerIcon

  • The module sets up and configures Bitlocker using official documentation, with the most secure configuration and military grade encryption algorithm, XTS-AES-256, to protect the confidentiality and integrity of all information at rest. CSP CSP

    • It offers 2 security levels for OS drive encryption: Enhanced and Normal.

    • In Normal security level, the OS drive is encrypted with TPM and Startup PIN. This provides very high security for your data, specially with a PIN that's long, complicated (uppercase and lowercase letters, symbols, numbers, spaces) and isn't the same as your Windows Hello PIN.

    • In Enhanced security level, the OS drive is encrypted with TPM and Startup PIN and Startup key. This provides the highest level of protection by offering Multifactor Authentication. You will need to enter your PIN and also plug in a flash drive, containing a special BitLocker key, into your device in order to unlock it. Continue reading more about it here.

    • Once the OS drive is encrypted, for every other non-OS drive, there will be prompts for confirmation before encrypting it. The encryption will use the same algorithm as the OS drive and uses Auto-unlock key protector. Removable flash drives are skipped.

    • The recovery information of all of the drives are saved in a single well-formatted text file in the root of the OS drive C:\BitLocker-Recovery-Info-All-Drives.txt. It's very important to keep it in a safe and reachable place as soon as possible, e.g., in OneDrive's Personal Vault which requires additional authentication to access. See here and here for more info. You can use it to unlock your drives if you ever forget your PIN, lose your Startup key (USB Flash Drive) or TPM no longer has the correct authorization (E.g., after a firmware change).

    • TPM has special anti-hammering logic which prevents malicious user from guessing the authorization data indefinitely. Microsoft defines that maximum number of failed attempts in Windows is 32 and every single failed attempt is forgotten after 2 hours. This means that every continuous two hours of powered on (and successfully booted) operation without an event which increases the counter will cause the counter to decrease by 1. You can view all the details using this PowerShell command: Get-TPM.

    • Check out Lock Screen category for more info about the recovery password and the 2nd anti-hammering mechanism.

    • BitLocker will bring you a real security against the theft of your device if you strictly abide by the following basic rules:

      • As soon as you have finished working, either Hibernate or shut Windows down and allow for every shadow of information to disappear from RAM within 2 minutes. This practice is recommended in High-Risk Environments.

      • Do not mix 3rd party encryption software and tools with Bitlocker. Bitlocker creates a secure end-to-end encrypted ecosystem for your device and its peripherals, this secure ecosystem is backed by things such as software, Virtualization Technology, TPM 2.0 and UEFI firmware, Bitlocker protects your data and entire device against real-life attacks and threats. You can encrypt your external SSDs and flash drives with Bitlocker too.

[!IMPORTANT] AMD Zen 2 and 3 CPUs have a vulnerability in them, if you use one of them, make sure your Bitlocker Startup PIN is at least 16 characters long (max is 20).

  • Disallows standard (non-Administrator) users from changing the Bitlocker Startup PIN or password CSP

  • (Only on Physical machines) Enables Hibernate and adds Hibernate to Start menu's power options. CSP

    • Devices that support Modern Standby have the most security because (S1-S3) power states which belong to the legacy sleep modes are not available. In Modern Standby, security components remain vigilant and the OS stays protected. Applying Microsoft Security Baselines also automatically disables the legacy (S1-S3) sleep states.
  • Enables network connectivity in standby on modern standby-capable systems. This ensures security updates for Microsoft Defender and Windows will be installed automatically. CSP

Refer to this official documentation about the countermeasures of Bitlocker

Device GuardDeviceGuardIcon

  • Virtualization-based protection of Code Integrity + UEFI Lock CSP
  • Enables Machine Identity Isolation Configuration in Enforcement mode.

[!TIP] Most of the Device Guard and Virtualization-Based Security features are Automatically enabled by default on capable and modern hardware. The rest of them will be enabled and configured to the most secure state after you apply the Microsoft Security Baselines and the Harden Windows Security policies.

[!IMPORTANT] About UEFI Lock

UEFI locked security measures are rooted in Proof of Physical Presence and they can't be disabled by modifying Group Policy, registry keys or other Administrative tasks. The only way to disable UEFI locked security measures is to have physical access to the computer, reboot and access the UEFI settings, supply the credentials to access the UEFI, turn off Secure Boot, reboot the system and then you will be able to disable those security measures with Administrator privileges.

[!NOTE] Device Protection in Windows Security Gives You One of These 4 Hardware Scores

TLS SecurityTLSIcon

Changes made by this category only affect things that use Schannel SSP: that includes IIS web server, built-in inbox Windows apps and some other programs supplied by Microsoft, including Windows network communications, but not 3rd party software that use portable stacks like Java, nodejs, python or php.

If you want to read more: Demystifying Schannel

[!NOTE] The only known program incompatible with this category is Battle.net game client.

  • Disables TLS 1 and TLS 1.1 security protocols that only exist for backward compatibility. All modern software should and do use TLS 1.2 and TLS 1.3. CSP CSP
  • Disables the following weak ciphers that are only available for backward compatibility: "DES 56-bit","RC2 40-bit","RC2 56-bit","RC2 128-bit","RC4 40-bit","RC4 56-bit","RC4 64-bit","RC4 128-bit","3DES 168-bit (Triple DES 168)" 
TLS_CHACHA20_POLY1305_SHA256
TLS_AES_256_GCM_SHA384
TLS_AES_128_GCM_SHA256
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256

nistP521
curve25519
NistP384
NistP256

curve25519
NistP256
NistP384

Read more in this Wiki post

Lock ScreenLockScreenIcon

  • Requires CTRL+ALT+DEL on the lock screen, kernel protected set of key strokes. The reason and logic behind it is: CSP

    • A malicious user might install malware that looks like the standard sign-in dialog box for the Windows operating system and capture a user's password. The attacker can then sign into the compromised account with whatever level of user rights that user has.

  • Enables a security anti-hammering feature that sets a threshold of 5 for the number of failed sign-in attempts that causes the device to be locked by using BitLocker. Sign-in attempts include Windows password or Windows Hello authentication methods. This threshold means, if the specified maximum number of failed sign-in attempts is exceeded, the device will invalidate the Trusted Platform Module (TPM) protector and any other protector except the 48-digit recovery password, and then reboot. During Device Lockout mode, the computer or device only boots into the touch-enabled Windows Recovery Environment (WinRE) until an authorized user enters the recovery password to restore full access.

    • This module (in the Bitlocker category) automatically saves the 48-digit recovery password of each drive in itself, the location of it will also be visible on the PowerShell console when you run it. It is very important to keep it in a safe and reachable place, e.g. in OneDrive's Personal Vault which requires authentication to access. See Here and Here for more info about OneDrive's Personal Vault
  • Configures account lockout policy: Account lockout threshold, Sets the number of allowed failed sign-in attempts to 5. In combination with other policies in this category, this means every 5 failed sign-in attempts will need a full day to pass before 5 more attempts can be made, otherwise Bitlocker will engage, system will be restarted and 48-digit Bitlocker code will be asked. This policy greatly prevents brute force attempts. CSP
  • Configures account lockout policy: Sets Account lockout duration to 1440 minutes or 1 day. In combination with other policies in this category, this means every 5 failed sign-in attempts will need a full day to pass before 5 more attempts can be made, otherwise Bitlocker will engage, system will be restarted and 48-digit Bitlocker code will be asked. CSP
  • Configures account lockout policy: Sets Reset account lockout counter to 1440 minutes or 1 day. In combination with other policies in this category, this means every 5 failed sign-in attempts will need a full day to pass before 5 more attempts can be made, otherwise Bitlocker will engage, system will be restarted and 48-digit Bitlocker code will be asked. CSP

  • Don't display username at sign-in; If a user signs in as Other user, the full name of the user isn't displayed during sign-in. In the same context, if users type their email address and password at the sign-in screen and press Enter, the displayed text "Other user" remains unchanged, and is no longer replaced by the user's first and last name, as in previous versions of Windows 10. Additionally, if users enter their domain user name and password and click Submit, their full name isn't shown until the Start screen displays. CSP

    • Useful If you have devices that store sensitive data, with monitors displayed in unsecured locations, or if you have devices with sensitive data that are remotely accessed, revealing logged on user's full names or domain account names

  • Don't display last signed-in; This security policy setting determines whether the name of the last user to sign in to the device is displayed on the Secure Desktop. If this policy is enabled, the full name of the last user to successfully sign in isn't displayed on the Secure Desktop, nor is the user's sign-in tile displayed. Additionally, if the Switch user feature is used, the full name and sign-in tile aren't displayed. The sign-in screen requests both Username + Windows Hello credentials. CSP

    • This feature can be useful to enable if you live in High-Risk Environments and you don't want anyone to get any information about your accounts when you aren't logged-in.

    • This policy will prevent you from using "Forgot my PIN" feature in lock screen or logon screen. If you forget your PIN, you won't be able to recover it.

    • If you use Windows Hello Face or Fingerprint, you can easily login using those credential providers without the need to supply username first.

  • Don't Display Network Selection UI on Lock Screen (like WIFI Icon); This setting allows you to control whether anyone can interact with available networks UI on the logon screen. Once enabled, the device's network connectivity state cannot be changed without signing into Windows. Suitable for High-Risk Environments. CSP

  • Applies the following PIN Complexity rules to Windows Hello CSP. Please note that, by default, any character can be set as a PIN. However, the following policies ensure that certain characters are always included as a minimum requirement.

    • Must include digits CSP

    • Expires every 180 days (default behavior is to never expire) CSP

      • Setting an expiration date ensures that, in the event of theft, a threat actor cannot indefinitely attempt to guess the PIN. After 180 days, the PIN expires, rendering it unusable even if guessed correctly. To reset the PIN, authentication via a Microsoft account or EntraIDlikely inaccessible to the attackerwill be required. Combined with anti-hammering and BitLocker policies, this expiration guarantees that a threat actor cannot endlessly persist in guessing the PIN.

    • History of the 1 most recent selected PIN is preserved to prevent the user from reusing it CSP

    • Must include lower-case letters CSP

User Account ControlUACIcon

  • Prompt for elevation of privilege on secure desktop for all binaries in Administrator accounts, which presents the sign-in UI and restricts functionality and access to the system until the sign-in requirements are satisfied. The secure desktop's primary difference from the user desktop is that only trusted processes running as SYSTEM are allowed to run here (that is, nothing is running at the user's privilege level). The path to get to the secure desktop from the user desktop must also be trusted through the entire chain. CSP

    • Default Behavior: Prompt for consent for non-Windows binaries: When an operation for a non-Microsoft application requires elevation of privilege, the user is prompted on the secure desktop to select either Permit or Deny. If the user selects Permit, the operation continues with the user's highest available privilege.

    • Harden Windows Security Behavior: When an operation requires elevation of privilege, the user is prompted on the secure desktop to select either Permit or Deny. If the user selects Permit, the operation continues with the user's highest available privilege.

  • Hides the entry points for Fast User Switching. CSP

    • This policy will prevent you from using "Forgot my PIN" feature in lock screen or logon screen. If you forget your PIN, you won't be able to recover it.
  • Sets the behavior of the elevation prompt for Standard users to Prompt for Credentials on the Secure Desktop. CSP
  • Configures the type of Admin Approval Mode to be Admin Approval Mode with enhanced privilege protection.

Windows FirewallFirewallIcon

  • Makes sure Windows Firewall is enabled for all profiles (which is the default) CSP CSP CSP
  • Sets inbound and outbound default actions for Domain Firewall Profile to Block; because this module is Not intended to be used on devices that are part of a domain or controlled by an Active Directory Domain Controller, since they will have their own policies and policy management systems in place. CSP CSP
  • Enables Windows Firewall logging for Domain, Private and Public profiles, sets the log file size for each of them to the max 32.767 MB. Defines separate log files for each of the firewall profiles. Logs only dropped packets for Private and Public profiles, Logs both dropped and successful packets for Domain profile. CSP CSP CSP CSP CSP CSP CSP CSP CSP

Optional Windows FeaturesOptionalFeaturesIcon

  • Enables these optional features (Control Panel):

    • Windows Sandbox: install, test and use programs in a disposable virtual operation system, completely separate from your main OS

    • Hyper-V: a great hybrid hypervisor (Type 1 and Type 2) to run virtual machines on. check out this Hyper-V Wiki page

Windows NetworkingNetworkingIcon

  • Disables Printing over HTTP because HTTP is not encrypted and it's an old feature that's not used anymore. CSP
  • Sets the minimum required SMB version for Client to 3.1.1 which is the latest available version at the moment and was introduced years ago with Windows 10.
  • Sets the minimum required SMB version for Server to 3.1.1 which is the latest available version at the moment and was introduced years ago with Windows 10.
  • Enables encryption for SMB Server. Its status can be checked using the following PowerShell command: (get-SmbServerConfiguration).EncryptData. If the returned value is $True then SMB Encryption is turned on.
  • Enables QUIC for SMB Client.
  • Enables QUIC for SMB Server.
  • Configures the Cipher Suites from the default value of AES_128_GCM,AES_128_CCM,AES_256_GCM,AES_256_CCM to AES_256_GCM,AES_256_CCM,AES_128_GCM,AES_128_CCM for the SMB Client. CSP
  • Configures the Cipher Suites from the default value of AES_128_GCM,AES_128_CCM,AES_256_GCM,AES_256_CCM to AES_256_GCM,AES_256_CCM,AES_128_GCM,AES_128_CCM for the SMB Server. CSP

Miscellaneous ConfigurationsMiscellaneousIcon

  • Sets Early launch antimalware engine's status to 8 which is Good only. The default value is 3, which allows good, unknown and 'bad but critical'. that is the default value, because setting it to 8 can prevent your computer from booting if the driver it relies on is critical but at the same time unknown or bad. CSP

    • By being launched first by the kernel, ELAM is ensured to be launched before any third-party software and is therefore able to detect malware in the boot process and prevent it from initializing. ELAM drivers must be specially signed by Microsoft to ensure they are started by the Windows kernel early in the boot process.
  • Disables location services (Location, Windows Location Provider, Location Scripting) system wide. Websites and apps won't be able to use your precise location, however they will still be able to detect your location using your IP address. CSP CSP CSP

  • Enables svchost.exe mitigations. built-in system services hosted in svchost.exe processes will have stricter security policies enabled on them. These stricter security policies include a policy requiring all binaries loaded in these processes to be signed by Microsoft, and a policy disallowing dynamically generated code. CSP

  • Turns on Enhanced mode search for Windows indexer. The default is classic mode. CSP
    • This causes some UI elements in the search settings in Windows settings to become unavailable for Standard user accounts to view, because it will be a managed feature by an Administrator.
  • Enables Edge browser (stable/beta/dev channels) to download and install updates on any network, metered or not; because the updates are important and should not be suppressed.
  • Enables the RPC Endpoint Mapper Client Authentication policy. CSP
  • Enables a policy that requests claims and compound authentication for Dynamic Access Control and Kerberos armoring. CSP

Windows Update ConfigurationsWindowsUpdate

Windows updates are extremely important. They always should be installed as fast as possible to stay secure and if a reboot is required, it should be done immediately. Threat actors can weaponize publicly disclosed vulnerabilities the same day their POC (Proof-Of-Concept) is released..

In Windows by default, devices will scan daily, automatically download and install any applicable updates at a time optimized to reduce interference with usage, and then automatically try to restart when the end user is away.

The following policies the module configures make sure the default behavior explained above is tightly enforced.

  • Enables "Receive Updates for other Microsoft products" (such as PowerShell)
  • Enables "Notify me when a restart is required to finish updating". CSP
  • Specifies the number of days before quality updates are installed on devices automatically to 1 day. CSP
  • Specifies the number of days before feature updates are installed on devices automatically to 1 day. CSP
  • Sets the number of grace period days before feature updates are installed on devices automatically to 1 day. CSP
  • Sets the number of grace period days before quality updates are installed on devices automatically to 1 day. CSP
  • Configures the automatic updates to happen every day, automatically be downloaded and installed, notify users for restart. CSP

Edge Browser configurationsEdgeBrowser 

TLS_RSA_WITH_AES_256_CBC_SHA  Reason: NO Perfect Forward Secrecy, CBC, SHA1
TLS_RSA_WITH_AES_128_CBC_SHA  Reason: NO Perfect Forward Secrecy, CBC, SHA1
TLS_RSA_WITH_AES_128_GCM_SHA256  Reason: NO Perfect Forward Secrecy
TLS_RSA_WITH_AES_256_GCM_SHA384  Reason: NO Perfect Forward Secrecy
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA  Reason: CBC, SHA1
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA  Reason: CBC, SHA1

Due to security reasons, many policies cannot be used when you are signed into Edge browser using personal Microsoft account. This module does not use any of those policies. When those policies are applied, they are ignored by the browser and edge://policy/ shows an error for them.

  • You can view all of the policies being applied to your Edge browser by visiting this page: edge://policy/
  • You can find all of the available internal Edge pages in here: edge://about/

Certificate Checking CommandsCertificateIcon

In this category, the module downloads and runs sigcheck64.exe from Sysinternals, then lists valid certificates not rooted to the Microsoft Certificate Trust List in the User and Machine certificate stores. Except for some possible Microsoft certificates, Windows insider builds certificates or certificates that have your own computer's name, which are perfectly safe and should not be deleted, All other certificates that will be listed should be treated as dangerous and removed from your system immediately.

Country IP BlockingCountryIPBlockingIcon

The module uses the newest range of IPv4 and IPv6 addresses of State Sponsors of Terrorism and OFAC Sanctioned Countries, directly from official IANA sources repository, then creates 2 rules (inbound and outbound) for each list in Windows firewall, completely blocking connections to and from those countries.

Once you have those Firewall rules added, you can use this method to see if any of the blocked connections were from/to those countries.

[!NOTE] Threat actors can use VPN, VPS etc. to mask their originating IP address and location. So don't take this category as the perfect solution for network protection.

Downloads Defense Measures

To combat the threat of more sophisticated malware, a preemptive measure is taken by creating and deploying a WDAC policy on the system. This policy blocks the execution of executables and other potentially harmful file types in the Downloads folder, using the WDACConfig module.

This policy defends the system from malware that can launch itself automatically after being downloaded from the Internet. The user must ensure the file's safety and explicitly transfer it to a different folder before running it.

The WDAC policy employs a wildcard pattern to prevent any file from running in the Downloads folder. Additionally, it verifies that the system downloads folder in the user directory matches the downloads folder in the Edge browser's settings. If there is a discrepancy, a warning message is displayed on the console.

Creates a custom WDAC policy that blocks the execution of the following executables:

  • wscript.exe
  • mshta.exe
  • cscript.exe

They are insecure, unsandboxed script hosts that pose a security risk. You can read more about them in here which is a blog post by Eric Lawrence from Microsoft.

All of the policies can be easily removed using the Unprotect-WindowsSecurity or Remove-WDACConfig cmdlets.

Non-Admin CommandsNonAdminIcon

You don't need Admin privileges to run this category, because no system-wide changes is made. Changes in this category only apply to the current user account that is running the PowerShell session.

  • Shows known file extensions in File explorer
  • Shows hidden files, folders and drives (toggles the control panel folder options item)
  • Disables websites accessing local language list - good for privacy
  • Turns off safe search in Windows search, will enable +18 content to appear in searches; essentially toggles the button in: Windows settings > privacy and security > search permissions > safe search
  • Enables Clipboard History
  • Turns on text suggestions when typing on the physical keyboard
  • Turns on "Multilingual text suggestions" for the current user, toggles the option in Windows settings
  • Turns off sticky key shortcut of pressing shift key 5 times fast
  • Disables Show reminders and incoming VoIP calls on the lock screen

RelatedRelatedIcon

Azure DevOps Repository (mirror)

Harden Windows Security website

Official global IANA IP block for each country

Windows Security Blog

WinSecureDNSMgr

Privacy, Anonymity and Compartmentalization

TrustTrustIcon

How can you 100% trust this repository and know that nothing shady is going on?

This repository uses the simplest possible, yet effective, methods that make it very easy to verify:

SupportSupportIcon

If you have any questions, requests, suggestions etc. about this GitHub repository and its content, please open a new discussion or Issue.

Reporting a vulnerability on this GitHub repository.

I can also be reached privately at: [email protected]

Security RecommendationsSecurityRecommendationIcon

  • Always download your operation system from official Microsoft websites. Right now, Windows 11 is the latest version of Windows, its ISO file can be downloaded from this official Microsoft server. One of the worst things you can do to your own security and privacy is downloading your OS, which is the root of all the active and passive security measures, from a 3rd party website claiming they have the official unmodified files. There are countless bad things that can happen as the result of it such as threat actors embedding malware or backdoors inside the customized OS, or pre-installing customized root CA certificates in your OS so that they can perform TLS termination and view all of your HTTPS and encrypted Internet data in plain clear text, even if you use VPN. Having a poisoned and compromised certificate store is the endgame for you, and that's just the tip of the iceberg.

  • Whenever you want to install a program or app, first use the Microsoft Store or Winget, if the program or app you are looking for isn't available in there, then download it from its official website. Somebody created a nice web interface for interacting with Winget CLI here. Using Winget or Microsoft store provides many benefits:

    • Microsoft store UWP apps are secure in nature, digitally signed, in MSIX format. That means, installing and uninstalling them is guaranteed and there won't be any leftovers after uninstalling.

    • Microsoft store has Win32 apps too, they are traditional .exe installers that we are all familiar with. The store has a library feature that makes it easy to find the apps you previously installed.

    • Both Microsoft and Winget check the hash of the files by default, if a program or file is tampered, they will warn you and block the installation, whereas when you manually download a program from a website, you will have to manually verify the file hash with the hash shown on the website, if any.

  • Use Secure DNS; Windows 11 natively supports DNS over HTTPS and DNS over TLS.

  • Only use Microsoft Edge for browser; It has the Highest-rated protection against phishing and malware, available by default on Windows OS, has tightly integrated valuable Security features such as Microsoft Defender Application Guard, Microsoft Defender SmartScreen, Hardware Enforced Stack Protection, Arbitrary Code Guard (ACG), Control Flow Guard (CFG), Tracking Prevention and Trusted built-in Secure Network feature from Cloudflare just to name a few.
  • Make sure OneDrive backup for important folders (Desktop/Documents/Pictures) is enabled. It is fast, secure and works in any network condition and since it's x64 (64-bit), it can handle a Lot of small and large files simultaneously.

  • When considering the use of a VPN, it is crucial to exercise discernment and only resort to it when absolutely necessary. A VPN can be a vital tool if you reside in a totalitarian, communist, or dictatorial regime, or in a nation where democratic principles are not upheld. However, if you live in a country that does not fall into these categories, it may be wise to reconsider the necessity of using a VPN. Your local ISP (Internet Service Provider) is likely more trustworthy than the ISP associated with a remote VPN server. By using a VPN, you are merely transferring the trust you place in your local ISP to an unknown entitythe ISP utilized by the VPN provider. It is important not to be swayed by the deceptive marketing tactics employed by VPN companies. The true identities, political affiliations, backgrounds, and loyalties of those behind these services often remain shrouded in mystery. In the permissive and open societies of the Western world, it is conceivable that a VPN service could be established by entities with questionable intentions, including state sponsors of terrorism or other hostile actors. Such services could be utilized to gather intelligence, conduct data mining, and track users, posing significant risks to your privacy and security.

  • Go passwordless with your Microsoft account and use Windows Hello authentication. In your Microsoft account which has Outlook service, you can create up to 10 Email aliases in addition to the 1 Email address you get when you made your Microsoft account, that means without creating a new account, you can have 11 Email addresses all of which will use the same inbox and account. You can specify which one of those Email aliases can be used to sign into your account, in the sign in preferences of your Microsoft account settings. So for example, when going passwordless, if you need you can give one of your Email aliases to others for communication or add it to a public profile of yours, then block sign in using that Email alias so nobody can send you authenticator notifications by entering that Email alias in the sign in page, and use the other 10 aliases that are private to sign into your Microsoft account with peace of mind. You can create a rule in your Outlook so that all of the Emails sent to your public Email alias will be stored in a different folder, apart from your other inbox emails. All of this can be done using free Microsoft account and Outlook webapp.
  • Set a strong password for the UEFI firmware of your device so that it will ask for password before allowing any changes to be made to firmware. You can also configure the password to be required on startup.
  • Use NTFS (which is the default Filesystem in Windows) or ReFS (Resilient File System, newer). In addition to all their benefits, they support Mark Of The Web (MOTW) or zone.identifier. When a file is downloaded to a device running Windows, Mark of the Web is added to the file, identifying its source as being from the internet. You can read all the information about it in here. If your USB flash drive is formatted as FAT32, change it to NTFS, because FAT32 does not keep the MOTW of the files. If the file you are downloading is compressed in .zip format, make sure you open/extract it using Windows built-in support for .zip files because it keeps the MOTW of the files. If the compressed file you downloaded is in other formats such as .7zip or .rar, make sure you use an archive program that supports keeping the mark of the Web of files after extraction. One of those programs is NanaZip which is a fork of 7zip, available in Microsoft Store and GitHub, compared to 7zip, it has better and modern GUI, and the application is digitally signed. After installation, open it, navigate to Tools at the top then select Options, set Propagate zone.id stream to Yes. You can use this PowerShell command to find all the info about the Zone Identifier of the files you downloaded from the Internet.
Get-Content <Path-To-File> -stream zone.identifier
  • When using Xbox, make sure you configure sign-in preference and set it to either Ask for my PIN or Lock it down. The latter is the most secure one since it will require authentication using Microsoft Authenticator app. Ask for my PIN is recommended for the most people because it will only require a PIN to be entered using controller.

  • A few reminders about open source programs:

    • Unless you are a skilled programmer who can understand and verify every line of code in the source, and spends time to personally build the software from the source, and repeats all the aforementioned tasks for each subsequent version, then seeing the source code won't have any effect on you because you aren't able to understand nor verify it.

    • Do not assume that the entire Open Source community audits and verifies every line of code just because the source code is available, as we've seen in the XZ utility's backdoor by state sponsored actors, they can have backdoors implanted in them in broad daylight and nobody might notice it for a long time.

    • The majority of open source programs are unsigned, meaning they don't have a digital signature, their developers haven't bought and used a code signing certificate to sign their program. Among other problems, this might pose a danger to the end-users by making it harder to create trust for those programs in security solutions such as Application Control or App Whitelisting, and makes it hard to authenticate them. Read Microsoft's Introduction to Code Signing. Use Azure Trusted Signing which is affordable.

  • Use Microsoft account (MSA) or Microsoft Entra ID to sign into Windows. Never use local administrators. Real security is achieved when there is no local administrator and identities are managed using Entra ID. You will be able to enforce Multi-factor unlock, for example use PIN + Fingerprint or PIN + Facial recognition, to unlock your device.
  • Enable Random Hardware Addresses In Windows Settings -> Network & Internet -> WIFI. Currently, there is no Group Policy or associated registry key to automatically turn it on, that is why it is mentioned here in the security recommendations section. It has various security and privacy benefits such as your device cannot be uniquely identified by its hardware Mac address and the routers your connect to cannot uniquely identify you. You can set it to change daily in your WIFI network adapter's settings in Windows settings for even more benefits.
  • More Security Recommendations coming soon...

ResourcesResourcesIcon

RoadmapRoadmapIcon

LicenseLicenseFreeIcon

Using MIT License. Free information without any paywall or things of that nature. The only mission of this GitHub repository is to give all Windows users accurate, up to date and correct facts and information about how to stay secure and safe in dangerous environments, and to stay not one, but Many steps, ahead of threat actors.

Credits

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Extracted from project README
PSScriptAnalyzer
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