Suspicious File Write to SharePoint Layouts Directory (via file_event)
This rule detects anomalous file writes to SharePoint layouts directory which could indicate webshell behavior or post-exploitation. This behavior has been observed in the exploitation of SharePoint vulnerabilities such as CVE-2025-49704, CVE-2025-49706 or CVE-2025-53770.
SigmahighWindowsv1
Full detection rule
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- Unknown
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.