**Hash reputation analysis** detects potential malware in Blob storage and Azure Files by comparing the hash values of newly uploaded blobs/files against those of known malware by [Microsoft Threat Intelligence](https://go.microsoft.com/fwlink/?linkid=2128684). Not all file protocols and operation types are supported with this capability, leading to some operations not being monitored for potential malware uploads. Unsupported use cases include SMB file shares and when a blob is created using [Put Block](/rest/api/storageservices/put-block) and [Put Block List](/rest/api/storageservices/put-block-list).
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