These attacks employ a snowball effect, spreading phishing emails from compromised accounts to all their contacts.
During March 2025, FOCS recorded a significant rise in such attempts. Attackers typically use fake login pages resembling Microsoft 365 notifications - such as OneDrive or SharePoint prompts - to trick users into providing credentials.
Once inside, hackers create email forwarding rules, allowing continued access to sensitive data even after password resets. A single compromised account can lead to widespread breaches, affecting employees, customers, partners, and suppliers.
FOCS provides security recommendations in its full report.
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