Policy CSP - Defender

AllowArchiveScanning

./Device/Vendor/MSFT/Policy/Config/Defender/AllowArchiveScanning 

This policy setting allows you to configure scans for malicious software and unwanted software in archive files such as .ZIP or .CAB files.

• If you enable or don't configure this setting, archive files will be scanned.

• If you disable this setting, archive files won't be scanned. However, archives are always scanned during directed scans.

Description framework properties:

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AllowBehaviorMonitoring

./Device/Vendor/MSFT/Policy/Config/Defender/AllowBehaviorMonitoring 

This policy setting allows you to configure behavior monitoring.

• If you enable or don't configure this setting, behavior monitoring will be enabled.

• If you disable this setting, behavior monitoring will be disabled.

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AllowCloudProtection

./Device/Vendor/MSFT/Policy/Config/Defender/AllowCloudProtection 

This policy setting allows you to join Microsoft MAPS. Microsoft MAPS is the online community that helps you choose how to respond to potential threats. The community also helps stop the spread of new malicious software infections.

You can choose to send basic or additional information about detected software. Additional information helps Microsoft create new security intelligence and help it to protect your computer. This information can include things like location of detected items on your computer if harmful software was removed. The information will be automatically collected and sent. In some instances, personal information might unintentionally be sent to Microsoft. However, Microsoft won't use this information to identify you or contact you.

Possible options are:

(0x0) Disabled (default) (0x1) Basic membership (0x2) Advanced membership.

Basic membership will send basic information to Microsoft about software that has been detected, including where the software came from, the actions that you apply or that are applied automatically, and whether the actions were successful.

Advanced membership, in addition to basic information, will send more information to Microsoft about malicious software, spyware, and potentially unwanted software, including the location of the software, file names, how the software operates, and how it has impacted your computer.

• If you enable this setting, you'll join Microsoft MAPS with the membership specified.

• If you disable or don't configure this setting, you won't join Microsoft MAPS.

In Windows 10, Basic membership is no longer available, so setting the value to 1 or 2 enrolls the device into Advanced membership.

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AllowEmailScanning

./Device/Vendor/MSFT/Policy/Config/Defender/AllowEmailScanning 

This policy setting allows you to configure e-mail scanning. When e-mail scanning is enabled, the engine will parse the mailbox and mail files, according to their specific format, in order to analyze the mail bodies and attachments. Several e-mail formats are currently supported, for example: pst (Outlook), dbx, mbx, mime (Outlook Express), binhex (Mac). Email scanning isn't supported on modern email clients.

• If you enable this setting, e-mail scanning will be enabled.

• If you disable or don't configure this setting, e-mail scanning will be disabled.

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AllowFullScanOnMappedNetworkDrives

./Device/Vendor/MSFT/Policy/Config/Defender/AllowFullScanOnMappedNetworkDrives 

This policy setting allows you to configure scanning mapped network drives.

• If you enable this setting, mapped network drives will be scanned.

• If you disable or don't configure this setting, mapped network drives won't be scanned.

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AllowFullScanRemovableDriveScanning

./Device/Vendor/MSFT/Policy/Config/Defender/AllowFullScanRemovableDriveScanning 

This policy setting allows you to manage whether or not to scan for malicious software and unwanted software in the contents of removable drives, such as USB flash drives, when running a full scan.

• If you enable this setting, removable drives will be scanned during any type of scan.

• If you disable or don't configure this setting, removable drives won't be scanned during a full scan. Removable drives may still be scanned during quick scan and custom scan.

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AllowIntrusionPreventionSystem

./Device/Vendor/MSFT/Policy/Config/Defender/AllowIntrusionPreventionSystem 

Allows or disallows Windows Defender Intrusion Prevention functionality.

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AllowIOAVProtection

./Device/Vendor/MSFT/Policy/Config/Defender/AllowIOAVProtection 

This policy setting allows you to configure scanning for all downloaded files and attachments.

• If you enable or don't configure this setting, scanning for all downloaded files and attachments will be enabled.

• If you disable this setting, scanning for all downloaded files and attachments will be disabled.

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AllowOnAccessProtection

./Device/Vendor/MSFT/Policy/Config/Defender/AllowOnAccessProtection 

This policy setting allows you to configure monitoring for file and program activity.

• If you enable or don't configure this setting, monitoring for file and program activity will be enabled.

• If you disable this setting, monitoring for file and program activity will be disabled.

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AllowRealtimeMonitoring

./Device/Vendor/MSFT/Policy/Config/Defender/AllowRealtimeMonitoring 

Allows or disallows Windows Defender Realtime Monitoring functionality.

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AllowScanningNetworkFiles

./Device/Vendor/MSFT/Policy/Config/Defender/AllowScanningNetworkFiles 

This policy setting allows you to configure scheduled scans and on-demand (manually initiated) scans for files that are accessed over the network. It is recommended to enable this setting.

• If you enable this setting or do not configure this setting, network files will be scanned.
• If you disable this setting, network files will not be scanned.

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AllowScriptScanning

./Device/Vendor/MSFT/Policy/Config/Defender/AllowScriptScanning 

Allows or disallows Windows Defender Script Scanning functionality.

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AllowUserUIAccess

./Device/Vendor/MSFT/Policy/Config/Defender/AllowUserUIAccess 

This policy setting allows you to configure whether or not to display AM UI to the users.

If you enable this setting AM UI won't be available to users.

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AttackSurfaceReductionOnlyExclusions

./Device/Vendor/MSFT/Policy/Config/Defender/AttackSurfaceReductionOnlyExclusions 

Exclude files and paths from Attack Surface Reduction (ASR) rules.

Enabled:

Specify the folders or files and resources that should be excluded from ASR rules in the Options section.

Enter each rule on a new line as a name-value pair:

• Name column: Enter a folder path or a fully qualified resource name. For example, "C:\Windows" will exclude all files in that directory. "C:\Windows\App.exe" will exclude only that specific file in that specific folder
• Value column: Enter "0" for each item.

Disabled:

No exclusions will be applied to the ASR rules.

Not configured:

Same as Disabled.

You can configure ASR rules in the Configure Attack Surface Reduction rules GP setting.

Description framework properties:

Group policy mapping:

AttackSurfaceReductionRules

./Device/Vendor/MSFT/Policy/Config/Defender/AttackSurfaceReductionRules 

Set the state for each Attack Surface Reduction (ASR) rule.

After enabling this setting, you can set each rule to the following in the Options section:

• Block: the rule will be applied
• Audit Mode: if the rule would normally cause an event, then it will be recorded (although the rule won't actually be applied)
• Off: the rule won't be applied
• Not Configured: the rule is enabled with default values
• Warn: the rule will be applied and the end-user will have the option to bypass the block.

Unless the ASR rule is disabled, a subsample of audit events are collected for ASR rules with the value of not configured.

Enabled:

Specify the state for each ASR rule under the Options section for this setting.

Enter each rule on a new line as a name-value pair:

• Name column: Enter a valid ASR rule ID
• Value column: Enter the status ID that relates to state you want to specify for the associated rule.

The following status IDs are permitted under the value column:

• 1 (Block)
• 0 (Off)
• 2 (Audit)
• 5 (Not Configured)
• 6 (Warn)

Example:

xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 0 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 1 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 2

Disabled:

No ASR rules will be configured.

Not configured:

Same as Disabled.

You can exclude folders or files in the "Exclude files and paths from Attack Surface Reduction Rules" GP setting.

Description framework properties:

Group policy mapping:

AvgCPULoadFactor

./Device/Vendor/MSFT/Policy/Config/Defender/AvgCPULoadFactor 

This policy setting allows you to configure the maximum percentage CPU utilization permitted during a scan. Valid values for this setting are a percentage represented by the integers 5 to 100. A value of 0 indicates that there should be no throttling of CPU utilization. The default value is 50.

• If you enable this setting, CPU utilization won't exceed the percentage specified.

• If you disable or don't configure this setting, CPU utilization won't exceed the default value.

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CheckForSignaturesBeforeRunningScan

./Device/Vendor/MSFT/Policy/Config/Defender/CheckForSignaturesBeforeRunningScan 

This policy setting allows you to manage whether a check for new virus and spyware security intelligence will occur before running a scan.

This setting applies to scheduled scans, but it has no effect on scans initiated manually from the user interface or to the ones started from the command line using "mpcmdrun -Scan".

• If you enable this setting, a check for new security intelligence will occur before running a scan.

• If you disable this setting or don't configure this setting, the scan will start using the existing security intelligence.

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CloudBlockLevel

./Device/Vendor/MSFT/Policy/Config/Defender/CloudBlockLevel 

This policy setting determines how aggressive Microsoft Defender Antivirus will be in blocking and scanning suspicious files.

If this setting is on, Microsoft Defender Antivirus will be more aggressive when identifying suspicious files to block and scan; otherwise, it will be less aggressive and therefore block and scan with less frequency.

For more information about specific values that are supported, see the Microsoft Defender Antivirus documentation site.

Possible options are:

(0x0) Default Microsoft Defender Antivirus blocking level (0x1) Moderate Microsoft Defender Antivirus blocking level, delivers verdict only for high confidence detections (0x2) High blocking level - aggressively block unknowns while optimizing client performance (greater chance of false positives) (0x4) High+ blocking level - aggressively block unknowns and apply additional protection measures (may impact client performance) (0x6) Zero tolerance blocking level - block all unknown executables.

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CloudExtendedTimeout

./Device/Vendor/MSFT/Policy/Config/Defender/CloudExtendedTimeout 

This feature allows Microsoft Defender Antivirus to block a suspicious file for up to 60 seconds, and scan it in the cloud to make sure it's safe.

The typical cloud check timeout is 10 seconds. To enable the extended cloud check feature, specify the extended time in seconds, up to an additional 50 seconds.

For example, if the desired timeout is 60 seconds, specify 50 seconds in this setting, which will enable the extended cloud check feature, and will raise the total time to 60 seconds.

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ControlledFolderAccessAllowedApplications

./Device/Vendor/MSFT/Policy/Config/Defender/ControlledFolderAccessAllowedApplications 

Add additional applications that should be considered "trusted" by controlled folder access.

These applications are allowed to modify or delete files in controlled folder access folders.

Microsoft Defender Antivirus automatically determines which applications should be trusted. You can configure this setting to add additional applications.

Enabled:

Specify additional allowed applications in the Options section.

Disabled:

No additional applications will be added to the trusted list.

Not configured:

Same as Disabled.

You can enable controlled folder access in the Configure controlled folder access GP setting.

Default system folders are automatically guarded, but you can add folders in the configure protected folders GP setting.

Description framework properties:

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ControlledFolderAccessProtectedFolders

./Device/Vendor/MSFT/Policy/Config/Defender/ControlledFolderAccessProtectedFolders 

Specify additional folders that should be guarded by the Controlled folder access feature.

Files in these folders can't be modified or deleted by untrusted applications.

Default system folders are automatically protected. You can configure this setting to add additional folders.

The list of default system folders that are protected is shown in Windows Security.

Enabled:

Specify additional folders that should be protected in the Options section.

Disabled:

No additional folders will be protected.

Not configured:

Same as Disabled.

You can enable controlled folder access in the Configure controlled folder access GP setting.

Microsoft Defender Antivirus automatically determines which applications can be trusted. You can add additional trusted applications in the Configure allowed applications GP setting.

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DaysToRetainCleanedMalware

./Device/Vendor/MSFT/Policy/Config/Defender/DaysToRetainCleanedMalware 

This policy setting defines the number of days items should be kept in the Quarantine folder before being removed.

• If you enable this setting, items will be removed from the Quarantine folder after the number of days specified.

• If you disable or don't configure this setting, items will be kept in the quarantine folder indefinitely and won't be automatically removed.

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DisableCatchupFullScan

./Device/Vendor/MSFT/Policy/Config/Defender/DisableCatchupFullScan 

This policy setting allows you to configure catch-up scans for scheduled full scans. A catch-up scan is a scan that's initiated because a regularly scheduled scan was missed. Usually these scheduled scans are missed because the computer was turned off at the scheduled time.

• If you disable or don't configure this setting, catch-up scans for scheduled full scans will be turned on. If a computer is offline for two consecutive scheduled scans, a catch-up scan is started the next time someone logs on to the computer. If there is no scheduled scan configured, there will be no catch-up scan run.

• If you enable this setting, catch-up scans for scheduled full scans will be disabled.

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DisableCatchupQuickScan

./Device/Vendor/MSFT/Policy/Config/Defender/DisableCatchupQuickScan 

This policy setting allows you to configure catch-up scans for scheduled quick scans. A catch-up scan is a scan that's initiated because a regularly scheduled scan was missed. Usually these scheduled scans are missed because the computer was turned off at the scheduled time.

• If you disable or don't configure this setting, catch-up scans for scheduled quick scans will be turned on. If a computer is offline for two consecutive scheduled scans, a catch-up scan is started the next time someone logs on to the computer. If there is no scheduled scan configured, there will be no catch-up scan run.

• If you enable this setting, catch-up scans for scheduled quick scans will be disabled.

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EnableControlledFolderAccess

./Device/Vendor/MSFT/Policy/Config/Defender/EnableControlledFolderAccess 

Enable or disable controlled folder access for untrusted applications. You can choose to block, audit, or allow attempts by untrusted apps to:

• Modify or delete files in protected folders, such as the Documents folder
• Write to disk sectors.

You can also choose to only block or audit writes to disk sectors while still allowing the modification or deletion of files in protected folders.

Microsoft Defender Antivirus automatically determines which applications can be trusted. You can add additional trusted applications in the Configure allowed applications GP setting.

Default system folders are automatically protected, but you can add folders in the Configure protected folders GP setting.

Block:

The following will be blocked:

• Attempts by untrusted apps to modify or delete files in protected folders
• Attempts by untrusted apps to write to disk sectors.

The Windows event log will record these blocks under Applications and Services Logs > Microsoft > Windows > Windows Defender > Operational > ID 1123.

Disabled:

The following won't be blocked and will be allowed to run:

• Attempts by untrusted apps to modify or delete files in protected folders
• Attempts by untrusted apps to write to disk sectors.

These attempts won't be recorded in the Windows event log.

Audit Mode:

The following won't be blocked and will be allowed to run:

• Attempts by untrusted apps to modify or delete files in protected folders
• Attempts by untrusted apps to write to disk sectors.

The Windows event log will record these attempts under Applications and Services Logs > Microsoft > Windows > Windows Defender > Operational > ID 1124.

Block disk modification only:

The following will be blocked:

• Attempts by untrusted apps to write to disk sectors.

The Windows event log will record these attempts under Applications and Services Logs > Microsoft > Windows > Windows Defender > Operational > ID 1123.

The following won't be blocked and will be allowed to run:

• Attempts by untrusted apps to modify or delete files in protected folders.

These attempts won't be recorded in the Windows event log.

Audit disk modification only:

The following won't be blocked and will be allowed to run:

• Attempts by untrusted apps to write to disk sectors
• Attempts by untrusted apps to modify or delete files in protected folders.

Only attempts to write to protected disk sectors will be recorded in the Windows event log (under Applications and Services Logs > Microsoft > Windows > Windows Defender > Operational > ID 1124).

Attempts to modify or delete files in protected folders won't be recorded.

Not configured:

Same as Disabled.

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EnableLowCPUPriority

./Device/Vendor/MSFT/Policy/Config/Defender/EnableLowCPUPriority 

This policy setting allows you to enable or disable low CPU priority for scheduled scans.

• If you enable this setting, low CPU priority will be used during scheduled scans.

• If you disable or don't configure this setting, not changes will be made to CPU priority for scheduled scans.

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EnableNetworkProtection

./Device/Vendor/MSFT/Policy/Config/Defender/EnableNetworkProtection 

Enable or disable Microsoft Defender Exploit Guard network protection to prevent employees from using any application to access dangerous domains that may host phishing scams, exploit-hosting sites, and other malicious content on the Internet.

Enabled:

Specify the mode in the Options section:

-Block: Users and applications won't be able to access dangerous domains -Audit Mode: Users and applications can connect to dangerous domains, however if this feature would've blocked access if it were set to Block, then a record of the event will be in the event logs.

Disabled:

Users and applications won't be blocked from connecting to dangerous domains.

Not configured:

Same as Disabled.

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ExcludedExtensions

./Device/Vendor/MSFT/Policy/Config/Defender/ExcludedExtensions 

Allows an administrator to specify a list of file type extensions to ignore during a scan. Each file type in the list must be separated by a |. For example, lib|obj.

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ExcludedPaths

./Device/Vendor/MSFT/Policy/Config/Defender/ExcludedPaths 

Allows an administrator to specify a list of directory paths to ignore during a scan. Each path in the list must be separated by a |. For example, C:\Example|C:\Example1.

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ExcludedProcesses

./Device/Vendor/MSFT/Policy/Config/Defender/ExcludedProcesses 

Allows an administrator to specify a list of files opened by processes to ignore during a scan.

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PUAProtection

./Device/Vendor/MSFT/Policy/Config/Defender/PUAProtection 

Enable or disable detection for potentially unwanted applications. You can choose to block, audit, or allow when potentially unwanted software is being downloaded or attempts to install itself on your computer.

Enabled:

Specify the mode in the Options section:

-Block: Potentially unwanted software will be blocked.

-Audit Mode: Potentially unwanted software won't be blocked, however if this feature would've blocked access if it were set to Block, then a record of the event will be in the event logs.

Disabled:

Potentially unwanted software won't be blocked.

Not configured:

Same as Disabled.

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RealTimeScanDirection

./Device/Vendor/MSFT/Policy/Config/Defender/RealTimeScanDirection 

This policy setting allows you to configure monitoring for incoming and outgoing files, without having to turn off monitoring entirely. It's recommended for use on servers where there is a lot of incoming and outgoing file activity but for performance reasons need to have scanning disabled for a particular scan direction. The appropriate configuration should be evaluated based on the server role.

Note that this configuration is only honored for NTFS volumes. For any other file system type, full monitoring of file and program activity will be present on those volumes.

The options for this setting are mutually exclusive:

0 = Scan incoming and outgoing files (default) 1 = Scan incoming files only 2 = Scan outgoing files only.

Any other value, or if the value doesn't exist, resolves to the default (0).

• If you enable this setting, the specified type of monitoring will be enabled.

• If you disable or don't configure this setting, monitoring for incoming and outgoing files will be enabled.

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ScanParameter

./Device/Vendor/MSFT/Policy/Config/Defender/ScanParameter 

This policy setting allows you to specify the scan type to use during a scheduled scan. Scan type options are:

1 = Quick Scan (default) 2 = Full Scan.

• If you enable this setting, the scan type will be set to the specified value.

• If you disable or don't configure this setting, the default scan type will be used.

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ScheduleQuickScanTime

./Device/Vendor/MSFT/Policy/Config/Defender/ScheduleQuickScanTime 

This policy setting allows you to specify the time of day at which to perform a daily quick scan. The time value is represented as the number of minutes past midnight (00:00). For example, 120 (0x78) is equivalent to 02:00 AM. By default, this setting is set to disabled. The schedule is based on local time on the computer where the scan is executing.

• If you enable this setting, a daily quick scan will run at the time of day specified.

• If you disable or don't configure this setting, daily quick scan controlled by this config won't be run.

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ScheduleScanDay

./Device/Vendor/MSFT/Policy/Config/Defender/ScheduleScanDay 

This policy setting allows you to specify the day of the week on which to perform a scheduled scan. The scan can also be configured to run every day or to never run at all.

This setting can be configured with the following ordinal number values:

(0x0) Every Day (0x1) Sunday (0x2) Monday (0x3) Tuesday (0x4) Wednesday (0x5) Thursday (0x6) Friday (0x7) Saturday (0x8) Never (default)

• If you enable this setting, a scheduled scan will run at the frequency specified.

• If you disable or don't configure this setting, a scheduled scan will run at a default frequency.

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ScheduleScanTime

./Device/Vendor/MSFT/Policy/Config/Defender/ScheduleScanTime 

This policy setting allows you to specify the time of day at which to perform a scheduled scan. The time value is represented as the number of minutes past midnight (00:00). For example, 120 (0x78) is equivalent to 02:00 AM. By default, this setting is set to a time value of 2:00 AM. The schedule is based on local time on the computer where the scan is executing.

• If you enable this setting, a scheduled scan will run at the time of day specified.

• If you disable or don't configure this setting, a scheduled scan will run at a default time.

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SecurityIntelligenceLocation

./Device/Vendor/MSFT/Policy/Config/Defender/SecurityIntelligenceLocation 

This policy setting allows you to define the security intelligence location for VDI-configured computers.

If you disable or don't configure this setting, security intelligence will be referred from the default local source.

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SignatureUpdateFallbackOrder

./Device/Vendor/MSFT/Policy/Config/Defender/SignatureUpdateFallbackOrder 

This policy setting allows you to define the order in which different security intelligence update sources should be contacted. The value of this setting should be entered as a pipe-separated string enumerating the security intelligence update sources in order. Possible values are: "InternalDefinitionUpdateServer", "MicrosoftUpdateServer", "MMPC", and "FileShares".

For Example: { InternalDefinitionUpdateServer | MicrosoftUpdateServer | MMPC }

• If you enable this setting, security intelligence update sources will be contacted in the order specified. Once security intelligence updates have been successfully downloaded from one specified source, the remaining sources in the list won't be contacted.

• If you disable or don't configure this setting, security intelligence update sources will be contacted in a default order.

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SignatureUpdateFileSharesSources

./Device/Vendor/MSFT/Policy/Config/Defender/SignatureUpdateFileSharesSources 

This policy setting allows you to configure UNC file share sources for downloading security intelligence updates. Sources will be contacted in the order specified. The value of this setting should be entered as a pipe-separated string enumerating the security intelligence update sources. For example: "{\\unc1 | \\unc2 }". The list is empty by default.

• If you enable this setting, the specified sources will be contacted for security intelligence updates. Once security intelligence updates have been successfully downloaded from one specified source, the remaining sources in the list won't be contacted.

• If you disable or don't configure this setting, the list will remain empty by default and no sources will be contacted.

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SignatureUpdateInterval

./Device/Vendor/MSFT/Policy/Config/Defender/SignatureUpdateInterval 

This policy setting allows you to specify an interval at which to check for security intelligence updates. The time value is represented as the number of hours between update checks. Valid values range from 1 (every hour) to 24 (once per day).

• If you enable this setting, checks for security intelligence updates will occur at the interval specified.

• If you disable or don't configure this setting, checks for security intelligence updates will occur at the default interval.

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SubmitSamplesConsent

./Device/Vendor/MSFT/Policy/Config/Defender/SubmitSamplesConsent 

This policy setting configures behavior of samples submission when opt-in for MAPS telemetry is set.

Possible options are:

(0x0) Always prompt (0x1) Send safe samples automatically (0x2) Never send (0x3) Send all samples automatically.

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ThreatSeverityDefaultAction

./Device/Vendor/MSFT/Policy/Config/Defender/ThreatSeverityDefaultAction 

This policy setting allows you to customize which automatic remediation action will be taken for each threat alert level. Threat alert levels should be added under the Options for this setting. Each entry must be listed as a name value pair. The name defines a threat alert level. The value contains the action ID for the remediation action that should be taken.

Valid threat alert levels are:

1 = Low 2 = Medium 4 = High 5 = Severe.

Valid remediation action values are:

2 = Quarantine 3 = Remove 6 = Ignore.

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