Detections
Analytics

2.1.5 (L2) Ensure Safe Attachments for SharePoint, OneDrive, and Microsoft Teams is Enabled

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This audit has been deprecated and will be removed in a future update.

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Information

Safe Attachments for SharePoint, OneDrive, and Microsoft Teams scans these services for malicious files.

Safe Attachments for SharePoint, OneDrive, and Microsoft Teams protect organizations from inadvertently sharing malicious files. When a malicious file is detected that file is blocked so that no one can open, copy, move, or share it until further actions are taken by the organization's security team.

Solution

To remediate using the UI:

 - Navigate to Microsoft 365 Defender https://security.microsoft.com
 - Under Email & collaboration select Policies & rules
 - Select Threat policies then Safe Attachments.
 - Click on Global settings
 - Click to Enable Turn on Defender for Office 365 for SharePoint, OneDrive, and Microsoft Teams
 - Click to Enable Turn on Safe Documents for Office clients
 - Click to Disable Allow people to click through Protected View even if Safe Documents identified the file as malicious.
 - Click Save

 To remediate using PowerShell:

 - Connect to Exchange Online using Connect-ExchangeOnline.
 - Run the following PowerShell command:
Set-AtpPolicyForO365 -EnableATPForSPOTeamsODB $true -EnableSafeDocs $true -AllowSafeDocsOpen $false

Impact:

Impact associated with Safe Attachments is minimal, and equivalent to impact associated with anti-virus scanners in an environment.

See Also

https://workbench.cisecurity.org/benchmarks/24619

Item Details

Category: SYSTEM AND INFORMATION INTEGRITY

References: 800-53|SI-3, 800-53|SI-8, 800-53|SI-16, CSCv7|7.10, CSCv7|8.1

Plugin: microsoft_azure

Control ID: 965692e62867eb98c1b8cb04de34036d209f89e64747878c42af4a4b20605e72