Abstract: Techniques are disclosed to detect, isolate, and/or mitigate an attack on a file system, for example, by malicious software, human actors, and/or compromised Internet-connected devices (bots). A processor of a data processing system detects an abnormal file system access pattern to a file system by applying statistical process control to network layer packets. Based on detecting the abnormal file system access pattern, the processor temporarily suspends file system access by at least one user ID contributing to the abnormal file system access pattern. The processor provides a notification identifying one or more file system object accessed in the abnormal file system access pattern.