Description

This rule checks for messages with or without attachments leveraging the Chase logo, and LinkAnalysis or Natural Language Understanding(NLU) has flagged credential phishing with medium to high confidence. The rule also excludes messages where all links are Chase affiliates, in addition to negating high trust sender root domains.

References

No references.

Sublime Security
Created Nov 17th, 2023 • Last updated Sep 23rd, 2026
Source
type.inbound
and (
  (
    length(attachments) <= 3
    and any(attachments,
            .file_type in $file_types_images
            and any(ml.logo_detect(.).brands, .name == "Chase")
    )
  )
  or (
    length(attachments) == 0
    and any(ml.logo_detect(file.message_screenshot()).brands, .name == "Chase")
  )
)
and 0 < length(body.links) < 10
and (
  any(body.links,
      any([ml.link_analysis(.)],
          .credphish.disposition == "phishing"
          and .credphish.brand.confidence in ("medium", "high")
      )
  )
  or any(ml.nlu_classifier(body.current_thread.text).intents,
         .name in ("cred_theft") and .confidence in ("medium", "high")
  )
)
and not all(body.links,
            .href_url.domain.root_domain in (
              "chasecdn.com",
              "chase.com",
              "chase.co.uk",
              "gslbjpmchase.com",
              "jpmorganchase.com",
              "jpmorgan.com",
              "jpmorganfunds.com",
              "jpmprivatebank.com",
              "paymentech.com"
            )
)

// 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)
)
and (
  not profile.by_sender().solicited
  or profile.by_sender().any_messages_malicious_or_spam
)
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