The Azure Storage Blob Bulk Deletion rule is designed to monitor and detect unusual patterns of blob deletions within Azure Storage accounts. By focusing on the DeleteBlob operation, this rule can signal potential malicious activities such as ransomware attacks, data destruction, or actions by malicious insiders. The rule is capable of detecting both individual deletion events as well as aggregating these events to identify bulk deletion patterns originating from the same caller IP address or storage account. The rule operates with a defined threshold of 15 deletion events over a 15-minute deduplication period, allowing it to effectively filter out noise from legitimate activity while flagging potentially harmful actions for further investigation.