ATOs are the new BEC. We're seeing it on our end and other companies have certainly taken notice. Attackers compromised 6.2 million customer accounts across 1,027 large organizations in 2024 according to Kasada’s 2025 Account Takeover Attack Trends Report, underscoring how routine ATO incidents have become for enterprise brands. Many of these compromises start with email and stolen credentials. For MSPs, this should be a "light bulb" moment that ATO prevention, detection, and response should be a core part of your managed security offering.

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Account takeover (ATO) attacks have become routine, with 6.2 million accounts compromised in 2024. Attackers use credential stuffing, phishing, and automated tools to gain access through valid credentials, then exploit mailbox rules and forwarding to commit fraud. A three-pillar defense strategy includes prevention through strong password policies and MFA, detection via behavioral monitoring inside mailboxes for anomalies like impossible travel and suspicious rules, and rapid response with session termination and cleanup. MSPs can operationalize this through API-based solutions that provide continuous inbox-level visibility, behavioral detection, and automated remediation across multiple tenants without touching MX records.

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