• Sublime Core Feed
Medium Severity

Link: Webflow link from unsolicited sender

Description

This detection rule matches on messaging containing at least one link to webflow.io from an unsolicited sender. Webflow.io provides a free plan enabling users to create custom websites and file hosting. This services has been abused by threat actors to host landing pages directing victims to a next stage of credential phishing.

References

No references.

Sublime Security
Created Sep 16th, 2024 • Last updated Aug 5th, 2025
Source
type.inbound
and any(body.links,
        // webflow link
        .href_url.domain.root_domain == 'webflow.io'
        and .href_url.domain.subdomain != ""
        and .href_url.domain.subdomain != "www"
        and .href_url.path == "/"
)
// not solicited or from malicious/spam user with no FPs
and (
  not profile.by_sender_email().solicited
  or (
    profile.by_sender_email().any_messages_malicious_or_spam
    and not profile.by_sender_email().any_messages_benign
  )
)

// not from high trust sender root domains
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
)
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