Microsoft Defender for Endpoint (MDE) Discovery Mode must enable Log4j2 detection.

Malicious code protection mechanisms include, but are not limited to, antivirus and malware detection software. To minimize potential negative impact to the organization that can be caused by malicious code, it is imperative that malicious code is identified and eradicated.

This setting detects devices with applications using the vulnerable Log4j2 library through unauthenticated probing. This option will also enable discovery using Server 2019+ onboarded devices.

Access the MDE portal as a user with at least an MDE Administrator or equivalent role:

1. In the navigation pane, select Settings >> Device Discovery >> Discovery setup (under Discovery setup). 2. Verify Standard discovery is selected and the slide bar for "Enable Log4j2 detection" is selected.

If the slide bar for "Enable Log4j2 detection" is not selected, this is a finding.

Access the MDE portal as a user with at least an MDE Administrator or equivalent role:

1. In the navigation pane, select Settings >> Endpoints >> Discovery setup (under Discovery setup). 2. Select Standard discovery. 3. Select the slide bar for "Enable Log4j2 detection".