• Sublime Core Feed

Description

Detects when an Issuu document contains suspicious links or text, where the document is set to open in full screen mode. The rule analyzes both embedded links and document content for malicious indicators, particularly focusing on suspicious top-level domains and language patterns.

References

No references.

Sublime Security
Created May 5th, 2025 • Last updated Aug 5th, 2025
Source
type.inbound
and any(body.links,
        .href_url.domain.root_domain == "issuu.com"
        and .href_url.query_params == "fr=xKAE9_zU1NQ" // opens the document full screen
        // suspicious link in the Issuu document
        and (
          any(filter(ml.link_analysis(., mode="aggressive").additional_responses,
                     strings.icontains(.url.path, "/links/")
              ),
              // less than 3 links in the Issuu document
              length(.json["1"]) < 3
              and any(.json["1"],
                  strings.parse_url(.["url"]).domain.tld in $suspicious_tlds
                  or strings.parse_url(.["url"]).domain.domain in $free_subdomain_hosts
                  or strings.parse_url(.["url"]).domain.root_domain in $free_subdomain_hosts
                  or ml.link_analysis(strings.parse_url(.["url"])).credphish.disposition == "phishing"
              )
          )
          // or, credential phishing language on the page
          or any(ml.nlu_classifier(beta.ocr(ml.link_analysis(.,
                                                             mode="aggressive"
                                            ).screenshot
                                   ).text
                 ).intents,
                 .name == "cred_theft" and .confidence != "low"
          )
        )
)
and not profile.by_sender_email().any_messages_benign
MQL Rule Console
DocsLearning Labs

Playground

Test against your own EMLs or sample data.

Share

Post about this on your socials.

Get Started. Today.

Managed or self-managed. No MX changes.

Deploy and integrate a free Sublime instance in minutes.
Get Started