When installed on Windows, Acunetix automatically uses Windows Defender. This software is already installed with Windows. No additional configuration is required.
When installed on Linux or MacOS, Acunetix uses ClamAV. You need to install ClamAV separately and Acunetix will automatically use it to scan for malware. On older versions of Windows that do not have the Windows Defender malware component, you can also use ClamAV.
Click here for instructions on how to configure Malware Scanning for use with Acunetix.