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Modify self-sender rule to detect suspicious links #4529

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Modify self-sender rule to detect suspicious links #4529

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8 changes: 3 additions & 5 deletions detection-rules/self_sender_french_copypaste_instructions_suspicious_domains.yml
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Original file line number Diff line number Diff line change
@@ -1,9 +1,11 @@
name: "Self-sender with copy/paste instructions and suspicious domains (French/Français)"
name: "Self-sender with suspicious links (French/Français)"
description: "Detects messages where the sender emails themselves with French text containing 'copier' (copy) and 'coller' (paste) instructions, along with suspicious domains like pages.dev or web.app. The subject line contains both the sender's email and display name, which are different values."
type: "rule"
severity: "medium"
source: |
type.inbound
// message is in French
and ml.nlu_classifier(body.current_thread.text).language == 'french'
// self sender
and (
length(recipients.to) == 1
Expand All @@ -13,10 +15,6 @@ source: |
and strings.icontains(subject.subject, sender.email.email)
and strings.icontains(subject.subject, sender.display_name)
and sender.email.email != sender.display_name
// copy
and strings.icontains(body.current_thread.text, 'copier')
// paste
and strings.icontains(body.current_thread.text, 'coller')
and (
strings.contains(body.current_thread.text, '.pages.dev')
or strings.contains(body.current_thread.text, '.web.app')
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