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@ -43,15 +43,15 @@ For more information about configuring attack surface reduction rules, see [Enab
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## Assess rule impact before deployment
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## Assess rule impact before deployment
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You can assess how an attack surface reduction rule might impact your network by opening the security recommendation for that rule in [threat and vulnerability management](https://docs.microsoft.com/windows/security/threat-protection/#tvm).
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You can assess how an attack surface reduction rule might affect your network by opening the security recommendation for that rule in [threat and vulnerability management](https://docs.microsoft.com/windows/security/threat-protection/#tvm).
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:::image type="content" source="images/asrrecommendation.png" alt-text="Security reco for attack surface reduction rule":::
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:::image type="content" source="images/asrrecommendation.png" alt-text="Security reco for attack surface reduction rule":::
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In the recommendation details pane, check the user impact to determine what percentage of your devices can accept a new policy enabling the rule in blocking mode without adverse impact to user productivity.
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In the recommendation details pane, check for user impact to determine what percentage of your devices can accept a new policy enabling the rule in blocking mode without adversely affecting productivity.
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## Audit mode for evaluation
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## Audit mode for evaluation
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Use [audit mode](audit-windows-defender.md) to evaluate how attack surface reduction rules would impact your organization if they were enabled. It's best to run all rules in audit mode first so you can understand their impact on your line-of-business applications. Many line-of-business applications are written with limited security concerns, and they may perform tasks in ways that seem similar to malware. By monitoring audit data and [adding exclusions](enable-attack-surface-reduction.md#exclude-files-and-folders-from-asr-rules) for necessary applications, you can deploy attack surface reduction rules without impacting productivity.
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Use [audit mode](audit-windows-defender.md) to evaluate how attack surface reduction rules would affect your organization if they were enabled. Run all rules in audit mode first so you can understand how they affect your line-of-business applications. Many line-of-business applications are written with limited security concerns, and they might perform tasks in ways that seem similar to malware. By monitoring audit data and [adding exclusions](enable-attack-surface-reduction.md#exclude-files-and-folders-from-asr-rules) for necessary applications, you can deploy attack surface reduction rules without reducing productivity.
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## Warn mode for users
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## Warn mode for users
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@ -95,13 +95,13 @@ Notifications and any alerts that are generated can be viewed in the Microsoft D
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You can use advanced hunting to view attack surface reduction events. To streamline the volume of incoming data, only unique processes for each hour are viewable with advanced hunting. The time of an attack surface reduction event is the first time that event is seen within the hour.
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You can use advanced hunting to view attack surface reduction events. To streamline the volume of incoming data, only unique processes for each hour are viewable with advanced hunting. The time of an attack surface reduction event is the first time that event is seen within the hour.
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For example, suppose that an attack surface reduction event occurs on ten devices during the 2:00 PM hour. Suppose that the first event occurred at 2:15, and the last at 2:45. With advanced hunting, you'll see one instance of that event (even though it actually occurred on ten devices), and its timestamp will be 2:15 PM.
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For example, suppose that an attack surface reduction event occurs on 10 devices during the 2:00 PM hour. Suppose that the first event occurred at 2:15, and the last at 2:45. With advanced hunting, you'll see one instance of that event (even though it actually occurred on 10 devices), and its timestamp will be 2:15 PM.
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For more information about advanced hunting, see [Proactively hunt for threats with advanced hunting](advanced-hunting-overview.md).
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For more information about advanced hunting, see [Proactively hunt for threats with advanced hunting](advanced-hunting-overview.md).
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## Attack surface reduction features across Windows versions
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## Attack surface reduction features across Windows versions
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You can set attack surface reduction rules for devices running any of the following editions and versions of Windows:
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You can set attack surface reduction rules for devices that are running any of the following editions and versions of Windows:
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- Windows 10 Pro, [version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709) or later
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- Windows 10 Pro, [version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709) or later
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- Windows 10 Enterprise, [version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709) or later
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- Windows 10 Enterprise, [version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709) or later
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- Windows Server, [version 1803 (Semi-Annual Channel)](https://docs.microsoft.com/windows-server/get-started/whats-new-in-windows-server-1803) or later
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- Windows Server, [version 1803 (Semi-Annual Channel)](https://docs.microsoft.com/windows-server/get-started/whats-new-in-windows-server-1803) or later
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@ -135,7 +135,7 @@ You can review the Windows event log to view events generated by attack surface
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You can create a custom view that filters events to only show the following events, all of which are related to controlled folder access:
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You can create a custom view that filters events to only show the following events, all of which are related to controlled folder access:
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|Event ID | Description |
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|Event ID | Description |
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|5007 | Event when settings are changed |
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|5007 | Event when settings are changed |
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|1121 | Event when rule fires in Block-mode |
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|1121 | Event when rule fires in Block-mode |
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|1122 | Event when rule fires in Audit-mode |
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|1122 | Event when rule fires in Audit-mode |
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@ -169,9 +169,9 @@ If you are configuring attack surface reduction rules by using Group Policy or P
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### Block Adobe Reader from creating child processes
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### Block Adobe Reader from creating child processes
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This rule prevents attacks by blocking Adobe Reader from creating additional processes.
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This rule prevents attacks by blocking Adobe Reader from creating processes.
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Through social engineering or exploits, malware can download and launch additional payloads and break out of Adobe Reader. By blocking child processes from being generated by Adobe Reader, malware attempting to use it as a vector are prevented from spreading.
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Through social engineering or exploits, malware can download and launch payloads, and break out of Adobe Reader. By blocking child processes from being generated by Adobe Reader, malware attempting to use it as a vector are prevented from spreading.
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This rule was introduced in:
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This rule was introduced in:
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- [Windows 10, version 1809](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1809)
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- [Windows 10, version 1809](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1809)
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@ -188,7 +188,7 @@ GUID: `7674ba52-37eb-4a4f-a9a1-f0f9a1619a2c`
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This rule blocks Office apps from creating child processes. Office apps include Word, Excel, PowerPoint, OneNote, and Access.
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This rule blocks Office apps from creating child processes. Office apps include Word, Excel, PowerPoint, OneNote, and Access.
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Creating malicious child processes is a common malware strategy. Malware that abuse Office as a vector often run VBA macros and exploit code to download and attempt to run additional payloads. However, some legitimate line-of-business applications might also generate child processes for benign purposes, such as spawning a command prompt or using PowerShell to configure registry settings.
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Creating malicious child processes is a common malware strategy. Malware that abuse Office as a vector often run VBA macros and exploit code to download and attempt to run more payloads. However, some legitimate line-of-business applications might also generate child processes for benign purposes, such as spawning a command prompt or using PowerShell to configure registry settings.
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This rule was introduced in:
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This rule was introduced in:
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- [Windows 10, version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709)
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- [Windows 10, version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709)
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@ -353,7 +353,7 @@ GUID: `75668C1F-73B5-4CF0-BB93-3ECF5CB7CC84`
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This rule prevents Outlook from creating child processes, while still allowing legitimate Outlook functions.
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This rule prevents Outlook from creating child processes, while still allowing legitimate Outlook functions.
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This rule protects against social engineering attacks and prevents exploit code from abusing vulnerabilities in Outlook. It also protects against [Outlook rules and forms exploits](https://blogs.technet.microsoft.com/office365security/defending-against-rules-and-forms-injection/) that attackers can use when a user's credentials are compromised.
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This rule protects against social engineering attacks and prevents exploiting code from abusing vulnerabilities in Outlook. It also protects against [Outlook rules and forms exploits](https://blogs.technet.microsoft.com/office365security/defending-against-rules-and-forms-injection/) that attackers can use when a user's credentials are compromised.
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> [!NOTE]
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> [!NOTE]
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> This rule applies to Outlook and Outlook.com only.
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> This rule applies to Outlook and Outlook.com only.
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@ -426,7 +426,7 @@ GUID: `b2b3f03d-6a65-4f7b-a9c7-1c7ef74a9ba4`
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This rule prevents VBA macros from calling Win32 APIs.
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This rule prevents VBA macros from calling Win32 APIs.
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Office VBA provides the ability to make Win32 API calls. Malware can abuse this capability, such as [calling Win32 APIs to launch malicious shellcode](https://www.microsoft.com/security/blog/2018/09/12/office-vba-amsi-parting-the-veil-on-malicious-macros/) without writing anything directly to disk. Most organizations don't rely on the ability to call Win32 APIs in their day-to-day functioning, even if they use macros in other ways.
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Office VBA enables Win32 API calls. Malware can abuse this capability, such as [calling Win32 APIs to launch malicious shellcode](https://www.microsoft.com/security/blog/2018/09/12/office-vba-amsi-parting-the-veil-on-malicious-macros/) without writing anything directly to disk. Most organizations don't rely on the ability to call Win32 APIs in their day-to-day functioning, even if they use macros in other ways.
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This rule was introduced in:
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This rule was introduced in:
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- [Windows 10, version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709)
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- [Windows 10, version 1709](https://docs.microsoft.com/windows/whats-new/whats-new-windows-10-version-1709)
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@ -42,7 +42,7 @@ Controlled folder access works best with [Microsoft Defender for Endpoint](../mi
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Controlled folder access works by only allowing trusted apps to access protected folders. Protected folders are specified when controlled folder access is configured. Typically, commonly used folders, such as those used for documents, pictures, downloads, and so on, are included in the list of controlled folders.
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Controlled folder access works by only allowing trusted apps to access protected folders. Protected folders are specified when controlled folder access is configured. Typically, commonly used folders, such as those used for documents, pictures, downloads, and so on, are included in the list of controlled folders.
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Controlled folder access works with a list of trusted apps. If an app is included in the list of trusted software, it works as expected. If not, the app is prevented from making any changes to files that are inside protected folders.
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Controlled folder access works with a list of trusted apps. Apps that are included in the list of trusted software work as expected. Apps that are not included in the list are prevented from making any changes to files inside protected folders.
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Apps are added to the list based upon their prevalence and reputation. Apps that are highly prevalent throughout your organization and that have never displayed any behavior deemed malicious are considered trustworthy. Those apps are added to the list automatically.
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Apps are added to the list based upon their prevalence and reputation. Apps that are highly prevalent throughout your organization and that have never displayed any behavior deemed malicious are considered trustworthy. Those apps are added to the list automatically.
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@ -52,7 +52,7 @@ Apps can also be added manually to the trusted list by using Configuration Manag
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Controlled folder access is especially useful in helping to protect your documents and information from [ransomware](https://www.microsoft.com/wdsi/threats/ransomware). In a ransomware attack, your files can get encrypted and held hostage. With controlled folder access in place, a notification appears on the computer where an app attempted to make changes to a file in a protected folder. You can [customize the notification](customize-attack-surface-reduction.md#customize-the-notification) with your company details and contact information. You can also enable the rules individually to customize what techniques the feature monitors.
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Controlled folder access is especially useful in helping to protect your documents and information from [ransomware](https://www.microsoft.com/wdsi/threats/ransomware). In a ransomware attack, your files can get encrypted and held hostage. With controlled folder access in place, a notification appears on the computer where an app attempted to make changes to a file in a protected folder. You can [customize the notification](customize-attack-surface-reduction.md#customize-the-notification) with your company details and contact information. You can also enable the rules individually to customize what techniques the feature monitors.
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The [protected folders](#review-controlled-folder-access-events-in-windows-event-viewer) include common system folders (including boot sectors), and you can [add additional folders](customize-controlled-folders.md#protect-additional-folders). You can also [allow apps](customize-controlled-folders.md#allow-specific-apps-to-make-changes-to-controlled-folders) to give them access to the protected folders.
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The [protected folders](#review-controlled-folder-access-events-in-windows-event-viewer) include common system folders (including boot sectors), and you can [add more folders](customize-controlled-folders.md#protect-additional-folders). You can also [allow apps](customize-controlled-folders.md#allow-specific-apps-to-make-changes-to-controlled-folders) to give them access to the protected folders.
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You can use [audit mode](audit-windows-defender.md) to evaluate how controlled folder access would impact your organization if it were enabled. You can also visit the Windows Defender Test ground website at [demo.wd.microsoft.com](https://demo.wd.microsoft.com?ocid=cx-wddocs-testground) to confirm the feature is working and see how it works.
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You can use [audit mode](audit-windows-defender.md) to evaluate how controlled folder access would impact your organization if it were enabled. You can also visit the Windows Defender Test ground website at [demo.wd.microsoft.com](https://demo.wd.microsoft.com?ocid=cx-wddocs-testground) to confirm the feature is working and see how it works.
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@ -69,6 +69,7 @@ Windows system folders are protected by default, along with several other folder
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- `c:\Users\<username>\Pictures`
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- `c:\Users\<username>\Pictures`
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- `c:\Users\Public\Pictures`
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- `c:\Users\Public\Pictures`
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- `c:\Users\Public\Videos`
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- `c:\Users\Public\Videos`
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- `c:\Users\<username>\Videos`
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- `c:\Users\<username>\Music`
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- `c:\Users\<username>\Music`
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- `c:\Users\Public\Music`
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- `c:\Users\Public\Music`
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- `c:\Users\<username>\Favorites`
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- `c:\Users\<username>\Favorites`
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@ -98,13 +99,9 @@ DeviceEvents
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You can review the Windows event log to see events that are created when controlled folder access blocks (or audits) an app:
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You can review the Windows event log to see events that are created when controlled folder access blocks (or audits) an app:
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1. Download the [Evaluation Package](https://aka.ms/mp7z2w) and extract the file *cfa-events.xml* to an easily accessible location on the device.
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1. Download the [Evaluation Package](https://aka.ms/mp7z2w) and extract the file *cfa-events.xml* to an easily accessible location on the device.
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2. Type **Event viewer** in the Start menu to open the Windows Event Viewer.
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2. Type **Event viewer** in the Start menu to open the Windows Event Viewer.
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3. On the left panel, under **Actions**, select **Import custom view...**.
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3. On the left panel, under **Actions**, select **Import custom view...**.
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4. Navigate to where you extracted *cfa-events.xml* and select it. Alternatively, [copy the XML directly](event-views.md).
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4. Navigate to where you extracted *cfa-events.xml* and select it. Alternatively, [copy the XML directly](event-views.md).
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5. Select **OK**.
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5. Select **OK**.
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The following table shows events related to controlled folder access:
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The following table shows events related to controlled folder access:
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@ -134,4 +131,4 @@ You can use the Windows Security app to view the list of folders that are protec
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- [Evaluate controlled folder access](evaluate-controlled-folder-access.md)
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- [Evaluate controlled folder access](evaluate-controlled-folder-access.md)
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- [Customize controlled folder access](customize-controlled-folders.md)
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- [Customize controlled folder access](customize-controlled-folders.md)
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- [Protect additional folders](customize-controlled-folders.md#protect-additional-folders)
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- [Protect more folders](customize-controlled-folders.md#protect-additional-folders)
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Block a user