To use the Fusion rule to detect multi-staged attacks that include suspicious sign-ins to contoso.com followed by anomalous Microsoft Office 365 activity, you should perform the following two actions:
* Create an Azure AD Identity Protection connector. This will allow you to monitor suspicious activities in your Azure AD tenant and detect malicious sign-ins.
* Create a custom rule based on the Office 365 connector templates. This will allow you to monitor and detect anomalous activities in the Microsoft 365 subscription. Reference: https://docs.microsoft.com/en- us/azure/sentinel/fusion-rules