Attachment: HTML smuggling 'body onload' with high entropy and suspicious text

type.inbound
and any(attachments,
        (
          .file_extension in~ ("html", "htm", "shtml", "dhtml", "xhtml")
          or (
            .file_extension is null
            and .file_type == "unknown"
            and .content_type == "application/octet-stream"
          )
          or .file_extension in~ $file_extensions_common_archives
          or .file_type == "html"
          or .content_type == "text/html"
        )
        and any(file.explode(.),
                .scan.entropy.entropy >= 5
                and any(.scan.strings.strings,
                        strings.ilike(., "*body onload*")
                )
                and any(.scan.strings.strings,
                        regex.icontains(., 'data:image/.*;base64')
                )
                and any(.scan.strings.strings,
                        strings.ilike(., "*document pass*")
                )
        )
)