Create attachment_creditcard_application_with_whatsapp.yml #3428
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Description
Noticed some FNs in a grey area in our detections and wanted to create a little defense in-depth. I want to let this sit in test rules for a few days to see telemetry before continuing to work on this logic. The intention here is to detect on promotional-looking emails for people signing up for new credit cards but are then sent to WhatsApp for the application process.
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