threat-intel
Insights into the clustering and reuse of phone numbers in scam emails
High
Summary
This article details Cisco Talos’s intelligence gathering on the increasing use of phone numbers in scam email campaigns. Attackers are leveraging API-driven VoIP providers like Sinch and Twilio to operate high-volume, difficult-to-trace scam operations, rotating through sequential phone number blocks to evade security filters. By focusing on phone number clustering, security researchers can better understand and combat these evolving threats.
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