Create brand_impersonation_mastercard.yml #2937
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Create brand_impersonation_mastercard.yml by @aidenmitchell #2937 Source SHA d76691d Triggered by @aidenmitchell
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Description
Detects messages impersonating Mastercard through similar display names, combined with security-themed content and authentication failures. Excludes legitimate Mastercard communications and trusted senders.
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