StMichael is a LKM that attempts to provide a level of protection against kernel-module rootkits. StMichael is designed to be loaded early in the system boot process, and is intended to be present and running on its host system prior to the introduction of malicious kernel modules. StMichael provides this protection by monitoring various portions of the kernel, and optionally the entire kernel text itself, for modifications that may indicate the presence of a malicious kernel module. If rootkit-like activity is detected, StMichael will attempt to recover the kernels integrity by rolling back the changes made to a previously known-good state.
