2026 Critical Enterprise Intrusion Chain Detection: Mass Data Download From Cloud Storage After Account Takeover
Detects anomalous, high-volume file download or sync activity by a single user within a 10-minute window in M365 (SharePoint/OneDrive). This behavior is indicative of bulk data exfiltration, potentially occurring after a session hijacking or account takeover, where the attacker leverages legitimate user credentials to access and export sensitive data.
Sigma
