VIP Impersonation via Google Group relay with suspicious indicators

(type.inbound or type.internal)
and sender.email.domain.root_domain in $org_domains

// subject, sender or reply to contains a VIP
and (
  any(headers.reply_to,
      any($org_vips, strings.contains(.display_name, ..display_name))
  )
  or any($org_vips, strings.contains(subject.subject, .display_name))
  or any($org_vips, strings.contains(sender.display_name, .display_name))
)
and any(headers.hops,
        any(.fields,
            strings.istarts_with(.name,
                                 "X-Authenticated-Sender",
                                 "X-Sender",
                                 "X-Original-Sender"
            )
        )
)

// reply to return path mismatch and not org domain
and any(headers.reply_to,
        .email.domain.root_domain != headers.return_path.domain.root_domain
        and .email.domain.root_domain not in $org_domains
)

// googlegroups found in hops
and any(headers.hops,
        .index == 0 and any(.fields, strings.icontains(.value, "googlegroups"))
)

// financial nlu entity in current thread
and 3 of (
  any(ml.nlu_classifier(body.current_thread.text).entities,
      .name == "financial"
  ),

  // invoice entity in display_text
  any(ml.nlu_classifier(body.current_thread.text).tags, .name == "invoice"),

  // fake thread
  (
    (subject.is_forward or subject.is_reply)
    and (
      (length(headers.references) == 0 and headers.in_reply_to is null)
      or headers.in_reply_to is null
    )
  ),

  // reply-to is freemail
  any(headers.reply_to, .email.domain.domain in $free_email_providers),

  // reply-to is not in $recipient_emails
  any(headers.reply_to, .email.email not in $recipient_emails),

  // dmarc authentication is freemail provider
  headers.auth_summary.dmarc.details.from.root_domain in $free_email_providers
)