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Description

Message contains use of the embluemail.com redirect. This has been exploited in the wild.

References

No references.

Sublime Security
Created Feb 6th, 2025 • Last updated Aug 5th, 2025
Source
type.inbound
and any(body.links,
        .href_url.domain.domain == "nts.embluemail.com"
        and strings.istarts_with(.href_url.path, '/p/cl')
        and strings.icontains(.href_url.query_params, '!')
        and regex.icontains(.href_url.query_params,
                            '\!(?:((?:%68|h)(?:%74|t){2}(?:%70|p)(?:%73|s)?)?(?:%3a|:))?(?:%2f|\/){2}'
        )
)
and not sender.email.domain.root_domain == "nts.embluemail.com"
and not strings.iends_with(headers.message_id, '@embluemail.com>')

// negate highly trusted sender domains unless they fail DMARC authentication
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
)
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