Sublime Security medium experimental mql

Attachment: Any HTML file (untrusted sender)

Potential HTML smuggling attacks from new senders. Use if passing HTML files is not normal behavior in your environment. This rule may be expanded to inspect HTML attachments for suspicious code.

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Detection Logic

type.inbound
and any(attachments,
        .file_extension in~ ('htm', 'html') or .file_type == "html"
)
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_messages_benign

// negate highly trusted sender domains unless they fail DMARC authentication or DMARC is missing
and not (
  sender.email.domain.root_domain in $high_trust_sender_root_domains
  and coalesce(headers.auth_summary.dmarc.pass, false)
)

Field Validations

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