This rule identifies potential threats posed by unsolicited emails that contain links to auto-downloaded DMG files in archives. It triggers when an inbound message includes a link that downloads an archive file (like a ZIP) that contains a DMG, a file often used on macOS systems for applications. The rule emphasizes the importance of evaluating the sender's profile, particularly focusing on whether they are common or trusted senders, and whether the message has been flagged as spam or malicious. The analysis includes checks for file extensions to ensure that the downloaded files match those typically associated with archives, combined with a sender analysis looking for flagged domains that may not pass DMARC authentication. Overall, the rule seeks to mitigate risks associated with malware or ransomware that may be distributed through unsolicited DMG files.