This rule detects the creation of topics in Google Cloud Platform (GCP) Pub/Sub, a messaging service that facilitates asynchronous communication between different services by allowing publishers to send messages to subscribers via topics. Unauthorized topic creation can signal malicious activities such as data exfiltration or service disruptions. The rule monitors for successful topic creation events by looking for specific actions in event logs ('google.pubsub.v*.Publisher.CreateTopic') alongside a successful outcome. To minimize false positives, investigators should assess whether the changes were made by known administrators or legitimate automated processes. Steps for analyzing the incidents include reviewing logs for event details, identifying the user or service account involved, and validating the necessity of the topic. If suspicious activity is confirmed, immediate actions include revoking permissions, deleting unauthorized topics, and enhancing monitoring to prevent future occurrences.