What should a security operations engineer de when reviewing suspicious, but successful, login activity?

Immediately disabling the user without full investigation could disrupt legitimate business operations if the activity was benign or a false positive, and may alert an attacker, allowing them to cover their tracks.

A successful login, even if suspicious, requires further context to determine if a breach occurred. Looking for preceding or subsequent activities like unusual data access, privilege escalation attempts, or connections from new locations helps establish a comprehensive timeline and identify the scope of potential compromise beyond the initial login.

Inspecting network firewalls for open ports is a network hygiene task, not an immediate step for investigating a specific suspicious user login activity; it's a general security posture check.

While reviewing other logged-in users and active accounts might be part of a broader incident response, the immediate next step for *this specific* suspicious login is to contextualize it with other activities related to that account.