ImageBaseAddress in PEB is wrong

0

I'm currently trying to retrieve the Image Base Address of a suspended 32-bits process.

I successfully retrieved the PEB VA by using (*CTX).Ebx - 0x1000 (where CTX is the CONTEXT structure retrieved with GetThreadContext()), it's in correlation with the data I got from some process analysis tools.

The problem is that the field ImageBaseAddress at offset 0x08 is equal to 0xffffffff. I verified and all the other fields are okay, if for example I create the process in debug mode the BeingDebugged byte is set to 1 etc...

And if I look with some tools where the Image of the PE is loaded I see that it's at 0x880000, unfortunately that data isn't present in the PEB.

So I basically tried to create a "normal" process that isn't suspended but I have the same problem.

All the fiels of the PEB are fine, the process too, there's just that 32-bits integer at offset 0x08 that is equal to 0xffffffff for some mysterious reasons.

(P.S.: I know that the PEB isn't documented and that it is not a great idea to depend of it as it's fields might change in the future but I really need to get the Image Base Address of a suspended process from it's PEB).

Thanks.

winapi
memory
portable-executable
asked on Stack Overflow Dec 28, 2019 by Aleister Crowley • edited Dec 29, 2019 by Aleister Crowley

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