A presentation examines the 2018 attack campaign against Mexican banks using the SPEI interbank payment system. The excerpt says the session explains how SPEI works, what happened inside affected banks during the incidents, and how the attacks operated. It frames the activity as a lesson for financial institutions that had ignored similar payment-system intrusions elsewhere. The supported defensive takeaway is to apply minimum security controls to transfer payment systems and other critical financial applications, even though the excerpt does not provide actor attribution or malware IOCs.