Windows Defender Scans

kitpzyxmsir said:

According to the Event Viewer, a Windows Defender Scan is listed it as "Scan Type: Antimalware." Does that include all threats?

Yes. Malware includes all threats.

Evaluation criteria for malware and unwanted software - Windows Defender Security Intelligence

kitpzyxmsir said:

Also, is a quick scan sufficient? What does a scan of the OS drive do that is different that the quick scan?

Quick scans look at all the locations where there could be malware registered to start with the system, such as registry keys and known Windows startup folders.

Combined with always-on real-time protection capability - which reviews files when they are opened and closed, and whenever a user navigates to a folder - a quick scan helps provide strong coverage both for malware that starts with the system and kernel-level malware.

In most instances, this means a quick scan is adequate to find malware that wasn't picked up by real-time protection.

A full scan can be useful on endpoints that have encountered a malware threat to identify if there are any inactive components that require a more thorough clean-up. In this instance, you may want to use a full scan when running an on-demand scan.

Windows Defender Antivirus and Microsoft antimalware FAQ - Windows Defender Security Intelligence