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Learning Malware Analysis by Monnappa K A

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9. Kernel Callbacks And Timers

The Windows operating system allows a driver to register a callback routine, which will be called when a particular event occurs. For instance, if a rootkit driver wants to monitor the execution and termination of all processes running on the system, it can register a callback routine for the process event by calling the kernel function PsSetCreateProcessNotifyRoutinePsSetCreateProcessNotifyRoutineEx, or PsSetCreateProcessNotifyRoutineEx2. When the process event occurs (starts or exits) the rootkit's callback routine will be invoked, which can then take necessary action such as preventing a process from launching. In the same manner, a rootkit driver can register a callback routine to receive notifications ...

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