Impersonation: Fake Gmail attachment

type.inbound
and any([body.html.display_text, body.current_thread.text, body.plain.raw],
        length(.) < 2500
        and (
          strings.icontains(., 'Scanned by Gmail')
          or (
            0 < regex.icount(., '\.pdf
| \.(doc
| xls
| ppt)x?') < 3
            and any(body.links,
                    regex.icontains(.display_text, 'd[ao0]wnl[ao0]{2}d all')
            )
            and length(body.links) < 4
          )
        )
        and regex.icontains(.,
                            '[KM]b\b'
        ) // file size
)

// 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
)
// if the sender has been marked as malicious, but has FPs, don't alert
and (
  (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
  or not profile.by_sender().any_messages_malicious_or_spam
)