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Update headers_outlook_express.yml #3485

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Merged
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Nov 6, 2025
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Update headers_outlook_express.yml #3485

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3 changes: 2 additions & 1 deletion detection-rules/headers_outlook_express.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,8 @@ description: "Detects emails claiming to be sent from Outlook Express, which is
type: "rule"
severity: "medium"
source: |
strings.icontains(headers.mailer, 'Outlook Express')
type.inbound
and strings.icontains(headers.mailer, 'Outlook Express')
and not profile.by_sender_email().any_messages_benign
tags:
- "Attack surface reduction"
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