Ever wonder where all the SMS spam comes from? If you are trying to send SMS “at scale,” there are a few options: You could sign up for a messaging provider like Twilio, the AWS SNS service, or several similar services. These services offer easily scriptable and affordable ways to send SMS messages. We have previously covered how attackers attempt to steal related credentials to use these services even cheaper (for free!).
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Article Link: Attacks against Teltonika Networks SMS Gateways - SANS Internet Storm Center