Suspicious PowerShell Mailbox Export to Share
Detects the use of the PowerShell `New-MailboxExportRequest` cmdlet to export a mailbox to a remote or local share. This activity has been observed in ProxyShell exploitation scenarios, where attackers exfiltrate mailbox data. The rule specifically looks for the cmdlet name, the `-Mailbox` parameter, and the `-FilePath` parameter followed by a UNC path (indicating a share).
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