# Scanning Network Files should be enabled

Verify that scanning network files is enabled despite SMB load considerations.

Source: https://maester.dev/docs/tests/MT.1156

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/bdrogja" title="Boris Drogja · Original author"><img src="https://github.com/bdrogja.png" alt="Boris Drogja" width="28" height="28" loading="lazy" decoding="async" /></a><a class="test-byline-avatar" href="/contributors/gbenrotto" title="Olugbenro Ogundipe · Co-contributor"><img src="https://github.com/Gbenrotto.png" alt="Olugbenro Ogundipe" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/bdrogja">Boris Drogja</a> with <a href="/contributors/gbenrotto">Olugbenro Ogundipe</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/maester">Maester</a> · Defender · Endpoint antivirus · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId MT.1156
```

## Overview

Verify that scanning network files is enabled despite SMB load considerations.

Disabled network file scanning creates attack vectors through shared files.

#### Remediation action:

1. Open [Microsoft Endpoint Manager](https://endpoint.microsoft.com) > **Endpoint Security** > **Antivirus**
2. Edit the relevant Microsoft Defender Antivirus policy
3. Enable **Allow Scanning Network Files**

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](https://learn.microsoft.com/intune/device-configuration/endpoint-security/antivirus#policy-merge-for-settings)
- [Configure Microsoft Defender Antivirus](https://learn.microsoft.com/microsoft-365/security/defender-endpoint/configure-microsoft-defender-antivirus-features)
- [Microsoft Endpoint Manager](https://endpoint.microsoft.com)

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | MT.1156 |
| Severity | Medium |
| 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 | T1080 Taint Shared Content |
| Supports controls | nist-800-53-r5:SI-3 |
| PowerShell test | [Test-MtMdeNetworkFileScanning](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1156.ps1) |
| Services | Graph |

</details>

## Source

- Test: [`tests/maester/defender/Test.MT.1156.ps1`](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1156.ps1)
- Documentation: [`tests/maester/defender/Test.MT.1156.md`](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1156.md)