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30
windows/security/threat-protection/auditing/event-4776.md
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@ -7,7 +7,7 @@ ms.mktglfcycl: deploy
ms.sitesec: library
ms.localizationpriority: none
author: dansimp
ms.date: 04/19/2017
ms.date: 09/13/2021
ms.reviewer:
manager: dansimp
ms.author: dansimp
@ -116,7 +116,7 @@ This event does *not* generate when a domain account logs on locally to a domain
| 0xC0000193 | Account logon with expired account. |
| 0xC0000224 | Account logon with "Change Password at Next Logon" flagged. |
| 0xC0000234 | Account logon with account locked. |
| 0xc0000371 | The local account store does not contain secret material for the specified account. |
| 0xC0000371 | The local account store does not contain secret material for the specified account. |
| 0x0 | No errors. |
> Table 1. Winlogon Error Codes.
@ -125,14 +125,14 @@ This event does *not* generate when a domain account logs on locally to a domain
For 4776(S, F): The computer attempted to validate the credentials for an account.
| **Type of monitoring required** | **Recommendation** |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **High-value accounts**: You might have high-value domain or local accounts for which you need to monitor each action.<br>Examples of high-value accounts are database administrators, built-in local administrator account, domain administrators, service accounts, domain controller accounts and so on. | Monitor this event with the **“Logon Account”** that corresponds to the high-value account or accounts. |
| **Type of monitoring required** | **Recommendation** |
|-----------------|---------|
| **High-value accounts**: You might have high-value domain or local accounts for which you need to monitor each action.<br>Examples of high-value accounts are database administrators, built-in local administrator account, domain administrators, service accounts, domain controller accounts and so on. | Monitor this event with the **“Logon Account”** that corresponds to the high-value account or accounts. |
| **Anomalies or malicious actions**: You might have specific requirements for detecting anomalies or monitoring potential malicious actions. For example, you might need to monitor for use of an account outside of working hours. | When you monitor for anomalies or malicious actions, use the **“Logon Account”** value (with other information) to monitor how or when a particular account is being used.<br>To monitor activity of specific user accounts outside of working hours, monitor the appropriate **Logon Account + Source Workstation** pairs. |
| **Non-active accounts**: You might have non-active, disabled, or guest accounts, or other accounts that should never be used. | Monitor this event with the **“Logon Account”** that should never be used. |
| **Account allow list**: You might have a specific allow list of accounts that are the only ones allowed to perform actions corresponding to particular events. | If this event corresponds to a “allow list-only” action, review the **“Logon Account”** for accounts that are outside the allow list. |
| **Restricted-use computers**: You might have certain computers from which certain people (accounts) should not log on. | Monitor the target **Source Workstation** for credential validation requests from the **“Logon Account”** that you are concerned about. |
| **Account naming conventions**: Your organization might have specific naming conventions for account names. | Monitor “**Logon Account”** for names that don’t comply with naming conventions. |
| **Non-active accounts**: You might have non-active, disabled, or guest accounts, or other accounts that should never be used. | Monitor this event with the **“Logon Account”** that should never be used. |
| **Account allow list**: You might have a specific allow list of accounts that are the only ones allowed to perform actions corresponding to particular events. | If this event corresponds to a “allow list-only” action, review the **“Logon Account”** for accounts that are outside the allow list. |
| **Restricted-use computers**: You might have certain computers from which certain people (accounts) should not log on. | Monitor the target **Source Workstation** for credential validation requests from the **“Logon Account”** that you are concerned about. |
| **Account naming conventions**: Your organization might have specific naming conventions for account names. | Monitor “**Logon Account”** for names that don’t comply with naming conventions. |
- If NTLM authentication should not be used for a specific account, monitor for that account. Don’t forget that local logon will always use NTLM authentication if an account logs on to a device where its user account is stored.
@ -142,12 +142,12 @@ For 4776(S, F): The computer attempted to validate the credentials for an accoun
- Consider tracking the following errors for the reasons listed:
| **Error to track** | **What the error might indicate** |
|-----------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error to track** | **What the error might indicate** |
|----------|----------------|
| **User logon with misspelled or bad user account** | For example, N events in the last N minutes can be an indicator of an account enumeration attack, especially relevant for highly critical accounts. |
| **User logon with misspelled or bad password** | For example, N events in the last N minutes can be an indicator of a brute-force password attack, especially relevant for highly critical accounts. |
| **User logon outside authorized hours** | Can indicate a compromised account; especially relevant for highly critical accounts. |
| **User logon from unauthorized workstation** | Can indicate a compromised account; especially relevant for highly critical accounts. |
| **User logon outside authorized hours** | Can indicate a compromised account; especially relevant for highly critical accounts. |
| **User logon from unauthorized workstation** | Can indicate a compromised account; especially relevant for highly critical accounts. |
| **User logon to account disabled by administrator** | For example, N events in last N minutes can be an indicator of an account compromise attempt, especially relevant for highly critical accounts. |
| **User logon with expired account** | Can indicate an account compromise attempt; especially relevant for highly critical accounts. |
| **User logon with account locked** | Can indicate a brute-force password attack; especially relevant for highly critical accounts. |
| **User logon with expired account** | Can indicate an account compromise attempt; especially relevant for highly critical accounts. |
| **User logon with account locked** | Can indicate a brute-force password attack; especially relevant for highly critical accounts. |

5
windows/security/threat-protection/microsoft-defender-application-guard/configure-md-app-guard.md
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@ -8,7 +8,7 @@ ms.pagetype: security
ms.localizationpriority: medium
author: denisebmsft
ms.author: deniseb
ms.date: 05/24/2021
ms.date: 09/16/2021
ms.reviewer:
manager: dansimp
ms.custom: asr
@ -54,10 +54,11 @@ These settings, located at `Computer Configuration\Administrative Templates\Wind
|-----------|------------------|-----------|-------|
|Configure Microsoft Defender Application Guard clipboard settings|Windows 10 Enterprise, 1709 or higher<p>Windows 10 Pro, 1803 or higher|Determines whether Application Guard can use the clipboard functionality.|**Enabled.** Turns On the clipboard functionality and lets you choose whether to additionally:<br/>- Disable the clipboard functionality completely when Virtualization Security is enabled.<br/>- Enable copying of certain content from Application Guard into Microsoft Edge.<br/>- Enable copying of certain content from Microsoft Edge into Application Guard. **Important:** Allowing copied content to go from Microsoft Edge into Application Guard can cause potential security risks and isn't recommended.<p>**Disabled or not configured.** Completely turns Off the clipboard functionality for Application Guard.|
|Configure Microsoft Defender Application Guard print settings|Windows 10 Enterprise, 1709 or higher<p>Windows 10 Pro, 1803 or higher|Determines whether Application Guard can use the print functionality.|**Enabled.** Turns On the print functionality and lets you choose whether to additionally:<br/>- Enable Application Guard to print into the XPS format.<br/>- Enable Application Guard to print into the PDF format.<br/>- Enable Application Guard to print to locally attached printers.<br/>- Enable Application Guard to print from previously connected network printers. Employees can't search for additional printers.<br/><br/>**Disabled or not configured.** Completely turns Off the print functionality for Application Guard.|
|Block enterprise websites to load non-enterprise content in IE and Edge|Windows 10 Enterprise, 1709 or higher|Determines whether to allow Internet access for apps not included on the **Allowed Apps** list.|**Enabled.** Prevents network traffic from both Internet Explorer and Microsoft Edge to non-enterprise sites that can't render in the Application Guard container. <p>**NOTE**: This action might also block assets cached by CDNs and references to analytics sites. Add them to the trusted enterprise resources to avoid broken pages.<p>**Disabled or not configured.** Prevents Microsoft Edge to render network traffic to non-enterprise sites that can't render in Application Guard. |
|Prevent enterprise websites from loading non-enterprise content in Microsoft Edge and Internet Explorer|Windows 10 Enterprise, 1709 or higher|Determines whether to allow Internet access for apps not included on the **Allowed Apps** list.|**Enabled.** Prevents network traffic from both Internet Explorer and Microsoft Edge to non-enterprise sites that can't render in the Application Guard container. <p>**NOTE**: This action might also block assets cached by CDNs and references to analytics sites. Add them to the trusted enterprise resources to avoid broken pages.<p>**Disabled or not configured.** Prevents Microsoft Edge to render network traffic to non-enterprise sites that can't render in Application Guard. |
|Allow Persistence|Windows 10 Enterprise, 1709 or higher<br><br>Windows 10 Pro, 1803 or higher|Determines whether data persists across different sessions in Microsoft Defender Application Guard.|**Enabled.** Application Guard saves user-downloaded files and other items (such as, cookies, Favorites, and so on) for use in future Application Guard sessions.<p>**Disabled or not configured.** All user data within Application Guard is reset between sessions.<p>**NOTE**: If you later decide to stop supporting data persistence for your employees, you can use our Windows-provided utility to reset the container and to discard any personal data.<p>**To reset the container:**<br/>1. Open a command-line program and navigate to `Windows/System32`.<br/>2. Type `wdagtool.exe cleanup`. The container environment is reset, retaining only the employee-generated data.<br/>3. Type `wdagtool.exe cleanup RESET_PERSISTENCE_LAYER`. The container environment is reset, including discarding all employee-generated data.|
|Turn on Microsoft Defender Application Guard in Managed Mode|Windows 10 Enterprise, 1809 or higher|Determines whether to turn on Application Guard for Microsoft Edge and Microsoft Office.|**Enabled.** Turns on Application Guard for Microsoft Edge and/or Microsoft Office, honoring the network isolation settings, rendering non-enterprise domains in the Application Guard container. Be aware that Application Guard won't actually be turned on unless the required prerequisites and network isolation settings are already set on the device. Available options:<br/>- Enable Microsoft Defender Application Guard only for Microsoft Edge<br/>- Enable Microsoft Defender Application Guard only for Microsoft Office<br/>- Enable Microsoft Defender Application Guard for both Microsoft Edge and Microsoft Office<br/><br/>**Disabled.** Turns off Application Guard, allowing all apps to run in Microsoft Edge and Microsoft Office.|
|Allow files to download to host operating system|Windows 10 Enterprise, 1803 or higher|Determines whether to save downloaded files to the host operating system from the Microsoft Defender Application Guard container.|**Enabled.** Allows users to save downloaded files from the Microsoft Defender Application Guard container to the host operating system. This action creates a share between the host and container that also allows for uploads from the host to the Application Guard container.<p>**Disabled or not configured.** Users are not able to save downloaded files from Application Guard to the host operating system.|
|Allow hardware-accelerated rendering for Microsoft Defender Application Guard|Windows 10 Enterprise, 1803 or higher<br><br>Windows 10 Pro, 1803 or higher|Determines whether Microsoft Defender Application Guard renders graphics using hardware or software acceleration.|**Enabled.** Microsoft Defender Application Guard uses Hyper-V to access supported, high-security rendering graphics hardware (GPUs). These GPUs improve rendering performance and battery life while using Microsoft Defender Application Guard, particularly for video playback and other graphics-intensive use cases. If this setting is enabled without connecting any high-security rendering graphics hardware, Microsoft Defender Application Guard will automatically revert to software-based (CPU) rendering. **Important:** Be aware that enabling this setting with potentially compromised graphics devices or drivers might pose a risk to the host device.<br><br>**Disabled or not configured.** Microsoft Defender Application Guard uses software-based (CPU) rendering and won’t load any third-party graphics drivers or interact with any connected graphics hardware.|
|Allow camera and microphone access in Microsoft Defender Application Guard|Windows 10 Enterprise, 1809 or higher<br><br>Windows 10 Pro, 1809 or higher|Determines whether to allow camera and microphone access inside Microsoft Defender Application Guard.|**Enabled.** Applications inside Microsoft Defender Application Guard are able to access the camera and microphone on the user's device. **Important:** Be aware that enabling this policy with a potentially compromised container could bypass camera and microphone permissions and access the camera and microphone without the user's knowledge.<p>**Disabled or not configured.** Applications inside Microsoft Defender Application Guard are unable to access the camera and microphone on the user's device.|
|Allow Microsoft Defender Application Guard to use Root Certificate Authorities from a user's device|Windows 10 Enterprise, 1809 or higher<br><br>Windows 10 Pro, 1809 or higher|Determines whether Root Certificates are shared with Microsoft Defender Application Guard.|**Enabled.** Certificates matching the specified thumbprint are transferred into the container. Use a comma to separate multiple certificates.<p>**Disabled or not configured.** Certificates are not shared with Microsoft Defender Application Guard.|
|Allow auditing events in Microsoft Defender Application Guard|Windows 10 Enterprise, 1809 or higher<br><br>Windows 10 Pro, 1809 or higher|This policy setting allows you to decide whether auditing events can be collected from Microsoft Defender Application Guard.|**Enabled.** Application Guard inherits auditing policies from your device and logs system events from the Application Guard container to your host.<p>**Disabled or not configured.** event logs aren't collected from your Application Guard container.|

3
windows/security/threat-protection/security-compliance-toolkit-10.md
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@ -37,6 +37,7 @@ The Security Compliance Toolkit consists of:
- Windows 10, Version 1507
- Windows Server security baselines
- Windows Server 2022
- Windows Server 2019
- Windows Server 2016
- Windows Server 2012 R2
@ -45,7 +46,7 @@ The Security Compliance Toolkit consists of:
- Microsoft 365 Apps for enterprise, Version 2104
- Microsoft Edge security baseline
- Version 92
- Version 93
- Windows Update security baseline
- Windows 10 20H2 and below (October 2020 Update)

6
windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules.md
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@ -40,6 +40,7 @@ Unless your use scenarios explicitly require them, Microsoft recommends that you
- bash.exe
- bginfo.exe<sup>1</sup>
- cdb.exe
- cscript.exe
- csi.exe
- dbghost.exe
- dbgsvc.exe
@ -69,6 +70,7 @@ Unless your use scenarios explicitly require them, Microsoft recommends that you
- wfc.exe
- windbg.exe
- wmic.exe
- wscript.exe
- wsl.exe
- wslconfig.exe
- wslhost.exe
@ -149,7 +151,7 @@ Select the correct version of each .dll for the Windows release you plan to supp
<Deny ID="ID_DENY_BGINFO" FriendlyName="bginfo.exe" FileName="BGINFO.Exe" MinimumFileVersion="4.21.0.0"/>
<Deny ID="ID_DENY_CBD" FriendlyName="cdb.exe" FileName="CDB.Exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_CSI" FriendlyName="csi.exe" FileName="csi.Exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_CSCRIPT" FriendlyName="cscript.exe" FileName="cscript.exe" MinimumFileVersion = "65535.65535.65535.65535" />
<Deny ID="ID_DENY_CSCRIPT" FriendlyName="cscript.exe" FileName="cscript.exe" MinimumFileVersion = "10.0.0.0" />
<Deny ID="ID_DENY_DBGHOST" FriendlyName="dbghost.exe" FileName="DBGHOST.Exe" MinimumFileVersion="2.3.0.0"/>
<Deny ID="ID_DENY_DBGSVC" FriendlyName="dbgsvc.exe" FileName="DBGSVC.Exe" MinimumFileVersion="2.3.0.0"/>
<Deny ID="ID_DENY_DNX" FriendlyName="dnx.exe" FileName="dnx.Exe" MinimumFileVersion="65535.65535.65535.65535"/>
@ -179,7 +181,7 @@ Select the correct version of each .dll for the Windows release you plan to supp
<Deny ID="ID_DENY_WFC" FriendlyName="WFC.exe" FileName="wfc.exe" MinimumFileVersion="65535.65535.65535.65535" />
<Deny ID="ID_DENY_WINDBG" FriendlyName="windbg.exe" FileName="windbg.Exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_WMIC" FriendlyName="wmic.exe" FileName="wmic.exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_WSCRIPT" FriendlyName="wscript.exe" FileName="wscript.exe" MinimumFileVersion = "65535.65535.65535.65535" />
<Deny ID="ID_DENY_WSCRIPT" FriendlyName="wscript.exe" FileName="wscript.exe" MinimumFileVersion = "10.0.0.0" />
<Deny ID="ID_DENY_WSL" FriendlyName="wsl.exe" FileName="wsl.exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_WSLCONFIG" FriendlyName="wslconfig.exe" FileName="wslconfig.exe" MinimumFileVersion="65535.65535.65535.65535"/>
<Deny ID="ID_DENY_WSLHOST" FriendlyName="wslhost.exe" FileName="wslhost.exe" MinimumFileVersion="65535.65535.65535.65535"/>

8
windows/security/threat-protection/windows-defender-security-center/wdsc-customize-contact-information.md
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@ -10,7 +10,7 @@ ms.pagetype: security
ms.localizationpriority: medium
author: dansimp
ms.author: dansimp
ms.date: 04/30/2018
ms.date: 09/13/2021
ms.reviewer:
manager: dansimp
ms.technology: mde
@ -36,8 +36,6 @@ You can add information about your organization in a contact card to the Windows
This information will also be shown in some enterprise-specific notifications (including notifications for the [Block at first sight feature](/windows/threat-protection/microsoft-defender-antivirus/configure-block-at-first-sight-microsoft-defender-antivirus), and [potentially unwanted applications](/windows/threat-protection/microsoft-defender-antivirus/detect-block-potentially-unwanted-apps-microsoft-defender-antivirus)).
![A security center notification.](images/security-center-custom-notif.png)
Users can select the displayed information to initiate a support request:
- Select **Call** or the phone number to open Skype to start a call to the displayed number.
@ -60,7 +58,7 @@ This can only be done in Group Policy.
3. Expand the tree to **Windows components > Windows Security > Enterprise Customization**.
4. Enable the contact card and the customized notifications by configuring two separate Group Policy settings. They will both use the same source of information (explained in Steps 5 and 6). You can enable both, or slect one or the other:
4. Enable the contact card and the customized notifications by configuring two separate Group Policy settings. They will both use the same source of information (explained in Steps 5 and 6). You can enable both, or select one or the other:
1. To enable the contact card, open the **Configure customized contact information** setting and set it to **Enabled**. Click **OK**.
@ -76,4 +74,4 @@ This can only be done in Group Policy.
7. Select **OK** after you configure each setting to save your changes.
>[!IMPORTANT]
>You must specify the contact company name and at least one contact method - email, phone number, or website URL. If you do not specify the contact name and a contact method the customization will not apply, the contact card will not show, and notifications will not be customized.
>You must specify the contact company name and at least one contact method - email, phone number, or website URL. If you do not specify the contact name and a contact method the customization will not apply, the contact card will not show, and notifications will not be customized.

14
windows/security/threat-protection/windows-defender-security-center/windows-defender-security-center.md
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@ -29,7 +29,7 @@ This library describes the Windows Security app, and provides information on con
In Windows 10, version 1709 and later, the app also shows information from third-party antivirus and firewall apps.
In Windows 10, version 1803, the app has two new areas, **Account protection** and **Device security**.
In Windows 10, version 1803, the app has two new areas: **Account protection** and **Device security**.
![Screenshot of the Windows Security app showing that the device is protected and five icons for each of the features.](images/security-center-home.png)
@ -75,20 +75,20 @@ You can find more information about each section, including options for configur
## How the Windows Security app works with Windows security features
> [!IMPORTANT]
> Microsoft Defender AV and the Windows Security app use similarly named services for specific purposes.
> Microsoft Defender Antivirus and the Windows Security app use similarly named services for specific purposes.
>
> The Windows Security app uses the Windows Security Service (*SecurityHealthService* or *Windows Security Health Servce*), which in turn utilizes the Security Center service ([*wscsvc*](/previous-versions/windows/it-pro/windows-xp/bb457154(v=technet.10)#EDAA)) to ensure the app provides the most up-to-date information about the protection status on the endpoint, including protection offered by third-party antivirus products, Windows Defender Firewall, third-party firewalls, and other security protection.
>
>These services do not affect the state of Microsoft Defender AV. Disabling or modifying these services will not disable Microsoft Defender AV, and will lead to a lowered protection state on the endpoint, even if you are using a third-party antivirus product.
>These services do not affect the state of Microsoft Defender Antivirus. Disabling or modifying these services will not disable Microsoft Defender Antivirus, and will lead to a lowered protection state on the endpoint, even if you are using a third-party antivirus product.
>
>Microsoft Defender AV will be [disabled automatically when a third-party antivirus product is installed and kept up to date]/microsoft-365/security/defender-endpoint/microsoft-defender-antivirus-compatibility).
>Microsoft Defender Antivirus will be [disabled automatically when a third-party antivirus product is installed and kept up to date](/microsoft-365/security/defender-endpoint/microsoft-defender-antivirus-compatibility).
>
> Disabling the Windows Security Center service will not disable Microsoft Defender AV or [Windows Defender Firewall](/windows/access-protection/windows-firewall/windows-firewall-with-advanced-security).
> Disabling the Windows Security Center service will not disable Microsoft Defender Antivirus or [Windows Defender Firewall](/windows/access-protection/windows-firewall/windows-firewall-with-advanced-security).
> [!WARNING]
> If you disable the Security Center service, or configure its associated Group Policy settings to prevent it from starting or running, the Windows Security app may display stale or inaccurate information about any antivirus or firewall products you have installed on the device.
>
> It may also prevent Microsoft Defender AV from enabling itself if you have an old or outdated third-party antivirus, or if you uninstall any third-party antivirus products you may have previously installed.
> It may also prevent Microsoft Defender Antivirus from enabling itself if you have an old or outdated third-party antivirus, or if you uninstall any third-party antivirus products you may have previously installed.
>
> This will significantly lower the protection of your device and could lead to malware infection.
@ -101,4 +101,4 @@ Disabling any of the individual features (through Group Policy or other manageme
> [!IMPORTANT]
> Individually disabling any of the services will not disable the other services or the Windows Security app.
For example, [using a third-party antivirus will disable Microsoft Defender Antivirus](/microsoft-365/security/defender-endpoint/microsoft-defender-antivirus-compatibility). However, the Windows Security app will still run, show its icon in the taskbar, and display information about the other features, such as Windows Defender SmartScreen and Windows Defender Firewall.
For example, [using a third-party antivirus will disable Microsoft Defender Antivirus](/microsoft-365/security/defender-endpoint/microsoft-defender-antivirus-compatibility). However, the Windows Security app will still run, show its icon in the taskbar, and display information about the other features, such as Windows Defender SmartScreen and Windows Defender Firewall.