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Update Defender policies
Signed-off-by: Tommy <contact@tommytran.io>
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# Microsoft Defender Antivirus
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**MAPS and features dependent on it are not enabled using this policy. It just configures how aggressive MAPS should be. This is quite invasive so I will only enable it for certain OUs.**
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus`
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## MAPS
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\MAPS`
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Microsoft Defender Antivirus MAPS is an interesting case. You should configure it depending on your threat model, and treat it like SmartScreen. We will disable automatic sample submission regardless because that could be privacy invasive.
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- Configure the 'Block at First Sight' feature -> Enabled
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- Send file samples when further analysis is required -> Enabled -> Always Prompt (Send safe sample works better with 'Block at First Sight, but I really, really do not trust Microsoft on this one)
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- Send file samples when further analysis is required -> Enabled -> Always Prompt
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## Controlled Folder Access
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Controlled Folder Access`
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- Configure Controlled folder access -> Enabled -> Block
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## Network Protection
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Network Protection`
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Only relevant if SmartScreen is used.
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Documentation:
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- https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/network-protection?view=o365-worldwide
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- https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/enable-network-protection?view=o365-worldwide
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Network Protection`
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This settings controls whether Network protection is allowed to be configured into block or audit mode on Windows -> Enabled (Only relevant if running Windows Server)
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Prevent users and apps from accessing dangerous websites -> Enabled -> Block
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## Controlled Folder Access
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## MpEngine
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Microsoft Defender Exploit Guard\Controlled Folder Access`
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\MpEngine`
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- Configure Controlled folder access -> Enabled -> Block
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Only relevant if MAPS is used
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- Enable file hash computation feature -> Enabled
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- Configure extended cloud check -> Specify the extended cloud check time in seconds -> 50
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- Select cloud protection level -> Zero tolerance blocking level
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## Quarantine
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Quarantine`
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- Configure local settings override for the removal of items from Quarantine folder -> Enabled
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- Configure removal of items from Quarantine folder -> 1 day
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## Scan
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`Computer Configuration\Administrative Templates\Windows Components\Microsoft Defender Antivirus\Scan`
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- Scan for the latest virus and spyware security intelligence before running a scheduled scan -> Enabled
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- Turn on catch-up quick scan -> Enabled
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## Security Intelligence Updates
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- Check for the latest virus and spyware security intelligence on startup -> Enabled
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