Inside the OpenAI invoice scam: SendGrid abuse and callback phishing explained - Kaseya
SendGrid Exploited in OpenAI Invoice Scam and Callback Phishing Campaign Kaseya has documented a sophisticated fraud campaign leveraging SendGrid's email infrastructure to execute OpenAI invoice scams and callback phishing attacks. Threat actors abuse SendGrid's legitimate email delivery platform to distribute fraudulent invoices impersonating OpenAI, combined with callback phishing techniques to compromise user credentials. The campaign demonstrates how CPaaS providers' email services can be weaponized for large-scale credential theft and financial fraud. This incident highlights the ongoing challenge of preventing account abuse while maintaining platform accessibility, and underscores the need for enhanced abuse detection, sender verification, and customer education across the industry.
EUM / SES Relevance
Directly relevant to AWS EUM/SES. This incident demonstrates the critical importance of sender reputation management, abuse detection, and authentication protocols (DKIM/SPF/DMARC) to prevent fraudulent use of email infrastructure. AWS EUM/SES customers should review their sending practices and implement strict verification controls to avoid similar abuse scenarios.
Key Takeaways
- arrow_right_alt SendGrid's email infrastructure was abused to distribute fraudulent OpenAI invoices at scale, targeting users with phishing callbacks
- arrow_right_alt Callback phishing technique combined with spoofed invoicing to trick users into revealing credentials or payment information
- arrow_right_alt Incident highlights vulnerability of CPaaS platforms to account compromise and abuse for credential theft campaigns
- arrow_right_alt Demonstrates need for stronger sender verification, abuse monitoring, and rapid response protocols across email providers
- arrow_right_alt Raises questions about platform responsibility in preventing fraud while balancing legitimate use cases