• Sublime Core Feed
Low Severity

Spam: URL shortener with short body content and emojis

Description

Detects spam from freemail senders, where the majority of the body is a URL shortener and emojis.

References

No references.

Sublime Security
Created Aug 17th, 2023 • Last updated Jul 23rd, 2025
Source
type.inbound

// sender is a freemail
and sender.email.domain.root_domain in $free_email_providers

// has a URL shortener
and any(body.links, .href_url.domain.root_domain in $url_shorteners or .href_url.domain.root_domain in $social_landing_hosts)

// short body, basically just the URL
and length(body.plain.raw) < 100

// has an emoji in the subject or body
and (
  regex.contains(body.plain.raw,
                 '[\x{1F300}-\x{1F5FF}\x{1F600}-\x{1F64F}\x{1F680}-\x{1F6FF}\x{1F700}-\x{1F77F}\x{1F780}-\x{1F7FF}\x{1F900}-\x{1F9FF}\x{2600}-\x{26FF}\x{2700}-\x{27BF}\x{2300}-\x{23FF}]'
  )
  or regex.contains(subject.subject,
                    '[\x{1F300}-\x{1F5FF}\x{1F600}-\x{1F64F}\x{1F680}-\x{1F6FF}\x{1F700}-\x{1F77F}\x{1F780}-\x{1F7FF}\x{1F900}-\x{1F9FF}\x{2600}-\x{26FF}\x{2700}-\x{27BF}\x{2300}-\x{23FF}]'
  )
)
and (
  profile.by_sender().prevalence in ("new", "outlier")
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_messages_benign
  )
)
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