Description

This rule analyzes image attachments for QR Codes in which LinkAnalysis concludes is phishing. The rule ensures that the URLs do not link to any organizational domains.

References

No references.

Sublime Security
Created Dec 6th, 2023 • Last updated Sep 23rd, 2026
Source
type.inbound
and length(attachments) < 10
and any(attachments,
        (.file_type in $file_types_images or .file_type == "pdf")
        and any(file.explode(.),
                .scan.qr.type == "url"

                // linkanalysis phishing disposition
                and any([ml.link_analysis(.scan.qr.url)],
                        .credphish.disposition == "phishing"
                )
                and .scan.qr.url.domain.root_domain not in $org_domains
        )
)
and (
  not profile.by_sender_email().solicited
  or not profile.by_sender_email().any_messages_benign
  or (
    profile.by_sender_email().any_messages_malicious_or_spam
    and not profile.by_sender_email().any_messages_benign
  )
  or (
    sender.email.domain.domain in $org_domains
    and not coalesce(headers.auth_summary.dmarc.pass, false)
  )
)

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