Operation DoppelBrand - phishing via abused third-party ESP sender account with fraud-themed subject

Arnold Chan@slaz

•updated Sep 12, 2026•0•0•1

Detects phishing attempts related to 'Operation DoppelBrand' campaign using common email service providers (ESPs) to spoof legitimate-looking emails with fraud-themed subjects, such as invoices or payment requests, associated with the Brickstorm malware.