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 Forums >>  Debuggers  >>  Restoring SSDT with WinDbg

Topic created on: September 21, 2006 04:41 CDT by weiss .

Has anyone here ever used WinDbg kernel debugger to modify the SSDT in order to restore the original entries from ntoskrnl.exe?

i was wondering if it would be possible to write a script or using its extensions for such operation??

i just want to be able to do this manually on a system using a debugger, if possible.

  anonymouse     September 21, 2006 09:20.59 CDT
yep sure windbg has a builtin
.chkimg
it can restore the hooks back to original shadow table entries

if you have set up correct symbols paths it can downlaod
the right ntoskrnl.exe for your system from ms symbol servers and use it as base for checking

also it can spit what was changed including the bytes thats changed etc etc pretty usefull

give it a spin check help file for various switches and its
uses

you can also crank a script to do that

with .for_each ()

  AlexIonescu     September 21, 2006 21:49.01 CDT
Hi,

I *Think* WinDBG's simple expression parser should be able to do it. The syntax is horrible and I've never really gotten the full hang of it (I just use the helpfile).

You can also simply code a WinDBG extension DLL. This is a DLL that will work in WinDBG like a plugin, so you can write !fixup.

Alternatively, you can use the Debugging COM Objects through the SDK to write your own standalone tool that does this. The Samples directory in the SDK shows ample examples on how to do this.

Best regards,
Alex Ionescu

  weiss     September 25, 2006 13:33.12 CDT
thanks for response, i'll check these things out.

AlexIonescu:reading your paper on subverting windows 2k3 sp1 kernel.not finished yet, so far, very good work!.

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