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 Forums >>  Target Specific - General  >>  "Rootkits: Subverting the Windows Kernel" Chapter 4 Algorithm Question

Topic created on: December 14, 2007 04:10 CST by jeffreytan .

In "Example: Hiding Processes using an SSDT Hook" of the chapter4 of this book, the hidding algorithm enumerates through the call result of SYSTEM_PROCESSES array. Then, it add any process time to the idle process.

But, it seems that this algorithm assumes the "idle" process is the last entry in the SYSTEM_PROCESSES array. What if the "idle" process in the middle of the array or even the first entry? I think the algorithm will fail.

If I have misunderstood the point, please feel free to point out. Thanks!

  jms     December 14, 2007 09:56.57 CST
The system idle process always has the PID 0, most likely this means that it has a static position in the SYSTEM_PROCESSES array. Just guessing here.

  jeffreytan   December 14, 2007 21:25.21 CST
Yes, I have the same suspicion either. But I think it is not good to depend on this feature. A better solution should be enumerating two times through the array. The first time to calculating the hidding processes time, the second time to find the idle process and add the time to it.

Thanks

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