# Full Scan Removable Drives should be enabled

Verify that full scan of removable drives is enabled to mitigate USB risks.

Source: https://maester.dev/docs/tests/MT.1154

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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.1154
```

## Overview

Verify that full scan of removable drives is enabled to mitigate USB risks.

Disabled removable drive scanning allows USB-based malware infections.

#### 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 Full Scan on Removable 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](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.1154 |
| 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 | T1091 Replication Through Removable Media |
| Supports controls | nist-800-53-r5:SI-3 |
| PowerShell test | [Test-MtMdeRemovableDriveScanning](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1154.ps1) |
| Services | Graph |

</details>

## Source

- Test: [`tests/maester/defender/Test.MT.1154.ps1`](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1154.ps1)
- Documentation: [`tests/maester/defender/Test.MT.1154.md`](https://github.com/maester365/maester/blob/main/tests/maester/defender/Test.MT.1154.md)