BEC/Fraud: Generic Scam attempt to Undisclosed Receipients

type.inbound

// undisclosed recipients
and any([recipients.to, recipients.bcc, recipients.cc],
        any(., .display_name =~ "Undisclosed recipients")
)

// mismatched sender (from) and Reply-to
and any(headers.reply_to,
        length(headers.reply_to) > 0
        and all(headers.reply_to,
                .email.domain.root_domain != sender.email.domain.root_domain
        )
)

// generic recipient
and any(ml.nlu_classifier(body.current_thread.text).entities,
        .name == "recipient" and regex.icontains(.text, "(sir|madam)")
)

// request made
and any(ml.nlu_classifier(body.current_thread.text).entities,
        .name == "request")

// not a bec scam
and all(ml.nlu_classifier(body.current_thread.text).intents,
        .name != "bec"
)

// 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 (
  (
    profile.by_sender().prevalence in ("new", "outlier")
    and not profile.by_sender().solicited
  )
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_false_positives
  )
)
and not profile.by_sender().any_false_positives