GCP Cloud Storage Bucket Object Enumerated

This rule detects attempts to enumerate objects within a Google Cloud Storage (GCS) bucket. It triggers when HTTP requests are made to 'storage.googleapis.com' with a URI containing '/b/', indicating an attempt to access or list buckets or their contents. The thresholding mechanism (10 events within 30 seconds from the same source IP) aims to identify rapid, potentially automated, enumeration activities.