The command line shows certutil being used to retrieve an archive from an external URL. Although this is suspicious, the immediate investigative question is how certutil was launched. The detection's process tree supplies that context by showing parent-child relationships, command lines, users, and related activity.
Identifying the parent process can reveal whether execution originated from a browser, Office application, script interpreter, scheduled task, service, or interactive shell. Logon events and firewall settings may become relevant later, but they do not directly establish the execution chain. An on-demand scan may find malicious files, yet it will not explain the initiating process. Reviewing the process tree first is therefore the most direct way to determine what executed certutil and how the behavior began.