Credential phishing: DocuSign embedded image lure with no DocuSign domains in links

type.inbound
// link boundary
and length(filter(body.links, .href_url.domain.valid)) < 25

// there are no attachments, or only small, likely signature images
and (
  length(attachments) == 0
  or (
    length(attachments) > 0
    and all(attachments, .size < 8000 and .file_type in $file_types_images)
  )
)

// Screenshot indicates a docusign logo or docusign name with cta to documents
and (
  (
    //
    // 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
    //
    strings.ilike(beta.ocr(file.message_screenshot()).text, "*DocuSign*")
    or any(ml.logo_detect(file.message_screenshot()).brands,
          .name == "DocuSign"
    )
  )
  and (
    (
      (
        //
        // 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
        //
        regex.icontains(beta.ocr(file.message_screenshot()).text,
                        "((re)?view|access|sign|complete(d)?) documen(t)?(s)?",
                        "Your document has been completed",
                        "New Document Shared with you",
                        "Kindly click the link",
                        "important edocs",
                        // German (Document (check|check|sign|sent))
                        "Dokument (überprüfen|prüfen|unterschreiben|geschickt)",
        )
        // German (important|urgent|immediate) but not in the Microsoft link
        or (
          (
            any(body.links,
                .display_text == "Erfahren Sie, warum dies wichtig ist"
                and .href_url.url == "https://aka.ms/LearnAboutSenderIdentification"
            )
            and regex.icount(beta.ocr(file.message_screenshot()).text,
                            "(wichtig|dringend|sofort)"
            ) > 1
          )
          or (
            not any(body.links,
                    .display_text == "Erfahren Sie, warum dies wichtig ist"
                    and .href_url.url == "https://aka.ms/LearnAboutSenderIdentification"
            )
            and regex.icount(beta.ocr(file.message_screenshot()).text,
                            "(wichtig|dringend|sofort)"
            ) > 0
          )
        )
      )
      and any(body.links,
              not strings.ilike(.href_url.domain.root_domain, "docusign.*")
              and (.display_text is null and .display_url.url is null)
      )
    )
    or any(body.links,
          not strings.ilike(.href_url.domain.root_domain, "docusign.*")
          and (
            regex.icontains(strings.replace_confusables(.display_text),
                            '(\bdocument|(view|get your) (docu|file))'
            )
            or strings.icontains(.display_text,
                                  "R\u{200F}E\u{200F}V\u{200F}I\u{200F}E\u{200F}W\u{200F} \u{200F}D\u{200F}O\u{200F}C\u{200F}U\u{200F}M\u{200F}E\u{200F}N\u{200F}T\u{200F}"
            )
          )
    )
  )
)

// links with null display_text that do not go to docusign.* (indicative of hyperlinked image) or the display text contains DOCUMENT 
and (
  not profile.by_sender().solicited
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
)
// 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
)

// negate legit replies
and not (
  length(headers.references) > 0
  or any(headers.hops, any(.fields, strings.ilike(.name, "In-Reply-To")))
)
and not profile.by_sender().any_messages_benign

// negate docusign X-Return-Path
and not any(headers.hops,
            .index == 0
            and any(.fields,
                    .name == "X-Return-Path"
                    and strings.ends_with(.value, "docusign.net")
            )
)

// negate "via" senders via dmarc authentication
and (
  not coalesce(headers.auth_summary.dmarc.pass
              and strings.contains(sender.display_name, "via")
              and sender.email.domain.domain in $org_domains,
              false
  )
)