This rule detects the execution of the 'ActiveMicrosoftApp' process as a child of Microsoft Excel, a scenario that is uncommon in day-to-day operations. Normally, Microsoft Excel primarily spawns internal Office-related processes and the creation of an 'ActiveMicrosoftApp' child process may indicate potential abuse or malicious activity. Adversaries often exploit trusted applications, like Excel, to blend in malicious actions, execute unauthorized code, or bypass application controls, leveraging such legitimate tools for initial access and execution in enterprise environments. This detection helps security teams identify suspicious child processes, warranting further investigation into the parent Excel process and subsequent network or file activities. While some legitimate Office features might trigger this process, unusual instances generally require deeper scrutiny to verify intent and rule out compromise. Investigating the context of the ActiveMicrosoftApp execution is critical in understanding its legitimacy.