Attachment: ICS file with links to newly registered domains

type.inbound
and any(attachments,
        (
          .file_type == "ics"
          or (
            .file_extension == "ics"
            or .content_type in ("application/ics", "text/calendar")
          )
        )
        //
        // This rule makes use of a beta feature and is subject to change without notice
        // using the beta feature in custom rules is not suggested until it has been formally released
        //
        and any(beta.file.parse_ics(.).events,
                any(.links, network.whois(.href_url.domain).days_old < 30)
        )
)