Description

Detects malicious messages sent from Wufoo's sending address (no-reply@wufoo.com) that are abusing the platform to deliver credential theft content. This rule identifies messages that lack Wufoo's standard display name and structural HTML elements found in legitimate Wufoo emails, while containing links and content classified as credential theft by NLU analysis.

References

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Sublime Security
Created Aug 5th, 2026 • Last updated Aug 5th, 2026
Source
type.inbound
and sender.email.email == 'no-reply@wufoo.com'
and not strings.icontains(sender.display_name, 'Wufoo')
// table found in legit wufoo emails
and not length(html.xpath(body.html, "//table[@class='readonly']").nodes) == 1
and 0 < length(body.links)
and any(ml.nlu_classifier(body.current_thread.text).intents,
        .name == 'cred_theft' and .confidence != 'low'
)
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