MT.1155 - Full Scan Mapped Drives should be disabled for performance.

Contributed by Boris Drogja with Olugbenro OgundipeAll contributors →

Overview

Verify that full scan of mapped network drives is disabled for performance.

Full scan on mapped drives can cause significant performance issues.

Remediation action:

1. Open Microsoft Endpoint Manager > Endpoint Security > Antivirus
2. Edit the relevant Microsoft Defender Antivirus policy
3. Disable Allow Full Scan on Mapped Network Drives

If your antivirus settings are split across several policies, this setting only needs to be set in one of them, as long as that policy is assigned to every device that needs it. No other assigned policy should set a different value: Intune does not merge this setting, so a device that receives both values may end up with either one, or none.

Related links

• Policy merge and conflicts for Antivirus policy settings
• Configure Microsoft Defender Antivirus
• Microsoft Endpoint Manager

Test Metadata

Field	Value
Test ID	MT.1155
Severity	Low
Suite	Maester
Product	Defender
Related products	Intune
Feature	Endpoint antivirus
Area	Devices and endpoints
Resource type	Policy
User impact	Low
Implementation cost	Low
MITRE ATT&CK	None
PowerShell test	Test-MtMdeMappedDriveScanning
Services	Graph

Source

• Test: tests/maester/defender/Test.MT.1155.ps1
• Documentation: tests/maester/defender/Test.MT.1155.md