Merge pull request #748 from MicrosoftDocs/martyav-cfa-doc-bug

updated description of how CFA works

windows/security/threat-protection/windows-defender-exploit-guard/controlled-folders-exploit-guard.md

@@ -11,8 +11,9 @@ ms.pagetype: security
 ms.localizationpriority: medium
 author: levinec
 ms.author: ellevin
-ms.date: 11/29/2018
-ms.reviewer: 
+audience: ITPro
+ms.date: 08/05/2019
+ms.reviewer: v-maave
 manager: dansimp
 ---
 
@@ -22,14 +23,17 @@ manager: dansimp
 
 - [Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP)](https://go.microsoft.com/fwlink/p/?linkid=2069559)
 
-Controlled folder access helps you protect valuable data from malicious apps and threats, such as ransomware. Controlled folder access is supported on Windows Server 2019 as well as Windows 10 clients.
-Controlled folder access works best with [Microsoft Defender Advanced Threat Protection](../microsoft-defender-atp/microsoft-defender-advanced-threat-protection.md), which gives you detailed reporting into controlled folder access events and blocks as part of the usual [alert investigation scenarios](../microsoft-defender-atp/investigate-alerts.md).
+Controlled folder access helps you protect valuable data from malicious apps and threats, such as ransomware. It protects your data by checking against a list of known, trusted apps. Controlled folder access is supported on Windows Server 2019 as well as Windows 10 clients. It can be turned on via the Windows Security App, or from the System Center Configuration Manager (SCCM) and Intune, for managed devices. Controlled folder access works best with [Microsoft Defender Advanced Threat Protection](../microsoft-defender-atp/microsoft-defender-advanced-threat-protection.md), which gives you detailed reporting into controlled folder access events and blocks as part of the usual [alert investigation scenarios](../microsoft-defender-atp/investigate-alerts.md).
 
-All apps (any executable file, including .exe, .scr, .dll files and others) are assessed by Windows Defender Antivirus, which then determines if the app is malicious or safe. If the app is determined to be malicious or suspicious, then it will not be allowed to make changes to any files in any protected folder.
+Controlled folder access works by only allowing apps to access protected folders if the app is included on a list of trusted software. If an app isn't on the list, Controlled folder access will block it from making changes to files inside protected folders.
 
-This is especially useful in helping to protect your documents and information from [ransomware](https://www.microsoft.com/wdsi/threats/ransomware) that can attempt to encrypt your files and hold them hostage.
+Apps are added to the trusted list based upon their prevalence and reputation. Apps that are highly prevalent throughout your organization, and that have never displayed any malicious behavior, are deemed trustworthy and automatically added to the list.
 
-A notification will appear on the computer where the app attempted to make changes to 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.
+Apps can also be manually added to the trusted list via SCCM and Intune. Additional actions, such as [adding a file indicator](../microsoft-defender-atp/respond-file-alerts.md#add-indicator-to-block-or-allow-a-file) for the app, can be performed from the Security Center Console.
+
+Controlled folder access is especially useful in helping to protect your documents and information from [ransomware](https://www.microsoft.com/wdsi/threats/ransomware) that can attempt to encrypt your files and hold them hostage.
+
+With Controlled folder access in place, a notification will appear on the computer where the app attempted to make changes to 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.
 
 The protected folders include common system folders, and you can [add additional folders](customize-controlled-folders-exploit-guard.md#protect-additional-folders). You can also [allow or whitelist apps](customize-controlled-folders-exploit-guard.md#allow-specific-apps-to-make-changes-to-controlled-folders) to give them access to the protected folders.
 
@@ -49,7 +53,7 @@ You can query Microsoft Defender ATP data by using [Advanced hunting](https://do
 
 Here is an example query
 
-```
+```PowerShell
 MiscEvents
 | where ActionType in ('ControlledFolderAccessViolationAudited','ControlledFolderAccessViolationBlocked')
 ```
@@ -60,15 +64,15 @@ You can review the Windows event log to see events that are created when control
 
 1. Download the [Exploit Guard Evaluation Package](https://aka.ms/mp7z2w) and extract the file *cfa-events.xml* to an easily accessible location on the machine.
 
-2. Type **Event viewer** in the Start menu to open the Windows Event Viewer.
+1. Type **Event viewer** in the Start menu to open the Windows Event Viewer.
 
-3. On the left panel, under **Actions**, click **Import custom view...**.
+1. On the left panel, under **Actions**, click **Import custom view...**.
 
-4. Navigate to where you extracted *cfa-events.xml* and select it. Alternatively, [copy the XML directly](event-views-exploit-guard.md).
+1. Navigate to where you extracted *cfa-events.xml* and select it. Alternatively, [copy the XML directly](event-views-exploit-guard.md).
 
-4. Click **OK**.
+1. Click **OK**.
 
-5. This will create a custom view that filters to only show the following events related to controlled folder access:
+1. This will create a custom view that filters to only show the following events related to controlled folder access:
 
 Event ID | Description
 -|-
@@ -76,8 +80,7 @@ Event ID | Description
 1124 | Audited controlled folder access event
 1123 | Blocked controlled folder access event
 
-
- ## In this section
+## In this section
 
 Topic | Description
 ---|---