Disabling Microsoft Defender and Antimalware Service Exe on EC2 Micro

The following link may have the answer to your question

https://support.microsoft.com/en-us/windows/turn-off-defender-antivirus-protection-in-windows-security-99e6004f-c54c-8509-773c-a4d776b77960

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Hello.

Try disabling Windows Defender from Group Policy Editor.
Open "gpedit.msc".
Then follow the groups in the following order.

Local Computer Policy > Administrative Templates > Windows Components > Windows Defender Antivirus 

Under "Windows Defender Antivirus" there is an item called "Turn off Windows Defender Antivirus", so right-click and open Edit.

When it opens, select "Enabled" and click "Apply".

After clicking, try restarting Windows.

The above steps were confirmed on Windows Server 2019.
Please note that the steps may be different for Windows Server 2022.