Attachment: Fake attachment image lure

type.inbound
and length(attachments) < 15
and (
  // fake file attachment preview in original email
  any(attachments,
      .file_type in $file_types_images
      and (
        any(ml.logo_detect(.).brands,
            .name == "FakeAttachment" and .confidence == "high"
        )
        or (
          .size < 30000
          and any(file.explode(.),
                  strings.icontains(.scan.ocr.raw, 'sent you')
                  // the attached image includes a filesize string
                  and regex.icontains(.scan.ocr.raw,
                                      '\b\d+.\d{1,2}\s?(k|m)b(\s|$)'
                  )
          )
        )
      )
  )
  // message body/screenhot
  or any(ml.logo_detect(file.message_screenshot()).brands,
         .name == "FakeAttachment" and .confidence == "high"
  )
  
  // Suspicious table with file size indicators 
  or regex.contains(body.html.raw,
                    "<table[^>]*>.*?<img[^>]+src=[\"']cid:[^\"']+[\"'][^>]*>.*?\\.(pdf|doc(x)|xls(x)?).*?<font[^>]*>\\s*\\d{1,4}\\.\\d{1,2}\\s*k[bB]"
  )

  // fake file attachment preview in attached EML
  or any(attachments,
         (.content_type == "message/rfc822" or .file_extension == "eml")
         and any(file.parse_eml(.).attachments,
                 .file_type in $file_types_images
                 and (
                   any(ml.logo_detect(.).brands, .name == "FakeAttachment")
                   or (
                     .size < 30000
                     and any(file.explode(.),
                             strings.icontains(.scan.ocr.raw, 'sent you')
                             // the attached image includes a filesize string
                             and regex.icontains(.scan.ocr.raw,
                                                 '\b\d+.\d{1,2}\s?(k|m)b(\s|$)'
                             )
                     )
                   )
                 )
         )
  )
)
and not (
  (
    strings.istarts_with(subject.subject, "RE:")
    or strings.istarts_with(subject.subject, "R:")
    or strings.istarts_with(subject.subject, "ODG:")
    or strings.istarts_with(subject.subject, "答复:")
    or strings.istarts_with(subject.subject, "AW:")
    or strings.istarts_with(subject.subject, "TR:")
    or strings.istarts_with(subject.subject, "FWD:")
    or regex.imatch(subject.subject, '(\[[^\]]+\]\s?){0,3}(re|fwd?)\s?:')
    or regex.imatch(subject.subject,
                    '^\[?(EXT|EXTERNAL)\]?[: ]\s*(RE|FWD?|FW|AW|TR|ODG|答复):.*'
    )
  )
  and (
    length(headers.references) > 0
    or any(headers.hops, any(.fields, strings.ilike(.name, "In-Reply-To")))
  )
)
// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)
and (
  sender.email.domain.root_domain not in ("sharepointonline.com")
  or not headers.auth_summary.dmarc.pass
)