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FP Tune: Update link_credential_phishing_secure_message.yml #800

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merged 1 commit into from
Sep 20, 2023
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FP Tune: Update link_credential_phishing_secure_message.yml #800

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14 changes: 8 additions & 6 deletions detection-rules/link_credential_phishing_secure_message.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -8,26 +8,28 @@ source: |
and any(ml.nlu_classifier(body.current_thread.text).intents,
.name == "cred_theft" and .confidence == "high"
)

// ----- other suspicious signals here -----
and strings.icontains(body.html.display_text, "secure message")

// todo: automated display name / human local part
// todo: suspicious link (unfurl click trackers)

// ----------

// has at least 1 link
and length(body.links) > 0

// negate legitimate message senders
and (
sender.email.domain.root_domain not in ("protectedtrust.com")
and any(body.links,
.href_url.domain.root_domain != sender.email.domain.root_domain
)
// Negate known secure mailer(s)
and not all(body.links, .href_url.domain.root_domain in ("mimecast.com"))
)

// first-time sender
and (
(
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