The 'Guacamole Two Users Sharing Session Anomaly' rule is designed to detect suspicious behavior associated with Apache Guacamole sessions where two different users are simultaneously present. This anomaly could indicate credential sharing, unauthorized access, or potential account compromise, representing a significant security risk. The detection logic focuses on monitoring the active session indicators that reveal when two users are logged into the same Guacamole session, creating an alert if this condition is met. The presence of multiple users in a singular session can warrant investigation as it contradicts typical usage patterns for this remote desktop gateway application. The rule is categorized with a high severity level, emphasizing its importance in detecting potential misuse of user credentials and ensuring user activity aligns with established security policies.