Sublime Security high experimental mql
Headers: Self-sender using Microsoft CompAuth bypass with credential theft content
Detects messages sent to self or invalid domains containing credential theft content that bypass Microsoft's CompAuth while failing both SPF and DMARC authentication checks.
Detection Logic
type.inbound
// self sender
and length(recipients.to) == 1
and length(recipients.cc) == 0
and length(recipients.bcc) == 0
and (
sender.email.email == recipients.to[0].email.email
or recipients.to[0].email.domain.valid == false
)
// cred theft
and any(ml.nlu_classifier(body.current_thread.text).intents,
.name == "cred_theft" and .confidence != "low"
)
// microsoft compauth pass, but spf and dmarc fail
and any(headers.hops, any(.fields, strings.icontains(.value, 'compauth=pass')))
and not coalesce(headers.auth_summary.dmarc.pass, false)
and not coalesce(headers.auth_summary.spf.pass, false) Field Validations
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