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Windows 7: How to change boot animation in Windows 7

11 Sep 2010   #161
joakim

ubuntu
 
 

I think the patch for signature checking in bootmgr must be done within bootmgr.exe itself and not the stub, since the stub only calculates basic checksum of bootmgr.exe.


My System SpecsSystem Spec
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11 Sep 2010   #162
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

Yes, it is for bootmgr.exe (now that we have terminology!). And for 32-bit only.

It is really nice to know that the stub only does checksum!
My System SpecsSystem Spec
11 Sep 2010   #163
joakim

ubuntu
 
 

Bingo, I just found it. It is just about patching a conditional jump. Just tested on 64-bit. Does not need to have bootmgr.exe signed with test certificate either.

Modify;
Code:
74165768f8964600 > 75165768f8964600
Joakim
My System SpecsSystem Spec
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11 Sep 2010   #164
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

Awesome! Is that for the built-in Windows 7 one?

My re-compression is going well. The benefit of having the Windows 7 is that it is compressed, you can add a ton of stuff to the XSL!

I also have to translate all my hacks from 32-bit into 64-bit...
My System SpecsSystem Spec
11 Sep 2010   #165
joakim

ubuntu
 
 

There is only 1 bootmgr for Windows 7, regardless of 32-bit/64-bit. Since I have not been able manually decompile the compressed bootmgr, I patched the pxe bootmgr.exe and attached the stub from vista sp0 (that handles uncompressed bootmgr.exe).

But the code should be the same inside the embedded bootmgr.exe.
My System SpecsSystem Spec
11 Sep 2010   #166
joakim

ubuntu
 
 

The checksum calculation in the stub can probably be disabled by the changing 7403 with EB08 at offset 0x105E

Joakim
My System SpecsSystem Spec
11 Sep 2010   #167
joakim

ubuntu
 
 

Just confirming that both these hacks works. In my 64-bit test environment I can boot with a bootmgr where certificate is invalidated and checksum is bad.

Joakim
My System SpecsSystem Spec
11 Sep 2010   #168
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

Awesome on all counts!

I still need to find out the 64-bit equivalents of my winload.exe hacks, and to redo the program.
My System SpecsSystem Spec
11 Sep 2010   #169
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

I have successfully created a re-compressor. I have combined them into one tool:

Coder for Life - Projects - Windows 7 Boot Updater - Bootmgr Zip

I would like to note that the decompressor is still losing a few bytes (~60 bytes from a 511.06 KB file, it just sets them to 0 because I don't know what to use). The compressor works very good, and decompressing the re-compressed file is perfect. My compression is not as good as the original, but just barely worse (1.5 KB larger out of a 344 KB file)!

So this is definitely good enough to begin testing things with, and I hope to find how to handle those pesky 60 bytes!
My System SpecsSystem Spec
11 Sep 2010   #170
thaimin

Windows 7 Pro 64 / 7 Pro 64 / 7 Home Prem 64
 
 

Actually, it struck me right after writing that how I could find the problem! Some of the missing bytes were in the resources section, where there are plenty of easy to understand strings and I found out what it was doing wrong!

It now works PERFECTLY. The checksum and digital certificate of the resulting "bootmgr.exe" file verify. So there it is! You can now use Windows 7 bootmgr fully!

(My compression is still a little worse than there's, but it doesn't matter, since its compressed we have 150 KB extra space!)
My System SpecsSystem Spec
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 How to change boot animation in Windows 7




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