Windows Defender Cleaner 1.4

Windows Defender is Microsoft's antivirus built into your Windows PC to protect you from viruses, malware threats, and attacks. It stores its info in several logs.

[1] Windows Defender Security Log
Whenever the Windows Defender runs a scan on your computer, it automatically stores the protection history in the Windows Defender Security Log. It also includes Controlled Folder Access blocks, along with any blocks which were made through the organizational configuration of Attack Surface Reduction Rules.

Though Protection History gets deleted after some time, the Windows Defender Security Log can become quite large, especially after an infection. Besides, the data stored in it may itself be used to see what sort of browsing history you have, which constitutes a breach of your privacy.

[2] Windows Health Center or WHC log
This log is used by Defender to report status and health information to the Windows operating system (e.g., whether real-time protection is enabled, if the product is up to date, or overall security health state). This log can be safely cleaned.

[3] Windows Defender Protection History log
Windows Defender Protection History displays recent actions, such as blocked threats and completed scans. It retains events for two weeks, showing critical (red) or informational (yellow) items that can be filtered to manage quarantined files. Events are automatically removed after two weeks. This log can be safely cleaned.

I've written a little batch file, especially for this tasks.

Windows Defender Cleaner 1.4

Windows Defender Cleaner 1.4 can be downloaded here.

Instructions:
- Download the batchfile to your Desktop
- Run as an Administrator (Right-click > 'Run as admin')

Changelog:
- [26jan26] version 1.4: Added removal of Windows Defender Protection History log (will be deleted on reboot)
- [24jan26] version 1.3: Added a better log
- [18jan26] version 1.2: Added cleaning of WHC log
- [15dec25] version 1.1: Added log to show how much is cleaned
- [15dec25] version 1.0: Initial release. Cleans Windows Defender Security Log.

ToDo:
- Add an option to 'simulate' the cleaning and reporting of the results before cleaning
- Add Windows Defender Event Log (Operational)
- Add MpCmdRun.log

Download Mirror: MajorGeeks.