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Topic created on: April 4, 2013 07:37 CDT by blowcheck .

Hi all,
another stupid question, i'm debugging an app with immdbg and ida, i'm not able to rebase in a correct way a .dll into idapro.
from the immdbg side i have 0043232B and in IDA i have 1006232B, so seems that xxxx232B is equal, how i should rebase the address in IDA?
Another doubt is, Are we speaking about RVA?
thanks a lot

blowcheck		April 4, 2013 15:29.12 CDT
i found this link.. http://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-bots-programs/wow-memory-editing/311142-some-help-needed-reversing.html but is not clear to me, someone is so kindly to help me? thanks

codeinject		April 5, 2013 01:34.31 CDT
Write down exactly what you are doing. This allows me to see what you do right, and what you do wrong. For now ASLR just springs to mind. But I might be off by a mile. Therefore, please write down what you do. How you got there. What happened, what you thought that should have happened. Maybe supported by screenshots and what not. - Codeinject

blowcheck		April 5, 2013 04:26.04 CDT
ok thanks codeinject. Well, ok i'm debugging an application on windows server 2003 (no aslr), the DLL that i want to load with IDAPRO is called DLLprog (as shown below), so since i'm debugging with immdbg i checked memory in this way: clicking on M (show memory window) i get: Memory map, item 38 Address=00410000 Size=00001000 (4096.) Owner=DLLprog 00410000 (itself) Section= Contains=PE header Type=Imag 01001002 Access=R Initial access=RWE clicking on E (show modules window ) i get: Executable modules, item 3 Base=00410000 Size=00146000 (1335296.) Entry=004B9BA1 DLLprog.<ModuleEntryPoint> Name=DLLprog File version=2.07 Path=C:\Program Files\Common Files\soft\rtt\cimay\bin\DLLprog.dll so the DLLprog address is 00410000 ( Is it VirtualAddrees or Relative Virtual Address ?? how to understand both with immdbg?) then since i would like to perform some cross-check with IDAPRO i loaded the DLLprog on it, i noticed that the address of the first segment in IDA is 0x10001000... is not 00410000 as immdbg shown above (on M address=00410000 and on E is Base=00410000..) I would like to rebase the whole program with IDA-pro in a correct way. Hope now is a little bit more clear, thanks in advance

blowcheck		April 5, 2013 04:44.06 CDT
a more detailed M (show memory window) about Dllprog 00410000 00001000 dllprog 00410000 (itself) PE header Imag R RWE 00411000 000B9000 dllprog 00410000 .text code Imag R E RWE 004CA000 00073000 dllprog 00410000 .rdata imports,exports Imag R RWE 0053D000 00006000 dllprog 00410000 .data data Imag RW RWE 00543000 00001000 dllprog 00410000 .rsrc resources Imag R RWE 00544000 00012000 dllprog 00410000 .reloc relocations Imag R RWE

codeinject		April 5, 2013 05:46.39 CDT
Well, I'd recommend you to first read this about RVA and VA: http://stackoverflow.com/questions/2170843/va-virtual-adress-rva-relative-virtual-address After that, when you use an old version of IDA (IDA Free for example) you can rebase segments with the segment tool ( shift + F7 ). This might also help you, http://stackoverflow.com/questions/10663139/rebasing-and-debugging Let me know if this helps you out.

blowcheck		April 5, 2013 06:33.34 CDT
ok, ehm i'm reading it.. not easy to understand.. to be honest i read it some days ago.. but i didn't catch the point..i feel ashamed..

blowcheck		April 5, 2013 07:01.06 CDT
ok done ida has been rebased correctly, but i tried many times.. not sure to have understood in deep. i got 41000000 + 1000 = 41100000 --> put it to ida (shift+F7) probably i could have used what the (show memory window) suggested because if i understood correctly 00411000 is where .text code start.., is it right? 00411000 000B9000 dllprog 00410000 .text code Imag R E RWE

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