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Xbox360 Forums => Xbox 360 Hacking Forums => Software Exploits Development / Research => Topic started by: TheSpecialist on November 23, 2005, 09:27:00 PM

Title: Disassembler For This Ibm Cpu ?
Post by: TheSpecialist on November 23, 2005, 09:27:00 PM
Here you can download the emulator XEX file:
http://assets.xbox.com/en-us/backwardcompa...ity/default.zip

I'd like to disassemble some instructions from this file, but I don't know which software to use. Does anyone know of some software to use ? Something that at least can translate bytes to opcodes for this type of CPU would be nice (some HIEW-like software for example).

This post has been edited by TheSpecialist: Nov 24 2005, 05:28 AM
Title: Disassembler For This Ibm Cpu ?
Post by: superjedi on November 24, 2005, 05:51:00 AM
objdump compiled with multiarch or IDA (Interactive Disassembler).
Title: Disassembler For This Ibm Cpu ?
Post by: kris5487 on November 24, 2005, 10:16:00 AM
Link isnt pointing to the correct url, it can be

Found Here
Title: Disassembler For This Ibm Cpu ?
Post by: atomiX on November 28, 2005, 07:48:00 AM
The update executable (default.xex) is encrypted. You won't be able to disassemble it unless you can decrypt it. Look at it with a hex editor and you will see what I mean.
Title: Disassembler For This Ibm Cpu ?
Post by: Pow_ on November 29, 2005, 09:42:00 PM
QUOTE(atomiX @ Nov 28 2005, 06:48 AM) View Post

The update executable (default.xex) is encrypted.

Or compressed.
Title: Disassembler For This Ibm Cpu ?
Post by: InterestedHacker on November 30, 2005, 04:23:00 AM
QUOTE(Pow_ @ Nov 30 2005, 06:49 AM) View Post

Or compressed.



Or both  ph34r.gif
Title: Disassembler For This Ibm Cpu ?
Post by: deadparrot on November 30, 2005, 10:03:00 AM
The guys over at Free60 believe it to be a modified .CAB archive, much like the .XCP.
Title: Disassembler For This Ibm Cpu ?
Post by: MGSolidus2 on December 04, 2005, 10:59:00 AM
Tried to dissasemble it with IDA, came up as binary. I looked at it with a hex editor, it's definitely encrypted. I don't know about compressed though.
Title: Disassembler For This Ibm Cpu ?
Post by: holydemon on December 05, 2005, 09:17:00 AM
i can probabaly take it through a debugger i made and decompress it and decrypt it but it would take a while
Title: Disassembler For This Ibm Cpu ?
Post by: TheSpecialist on December 07, 2005, 05:31:00 PM
QUOTE(holydemon @ Dec 5 2005, 05:17 PM) View Post

i can probabaly take it through a debugger i made and decompress it and decrypt it but it would take a while

And how would you decrypt it ? There's nothing known yet about the encryption technique.
Title: Disassembler For This Ibm Cpu ?
Post by: maddy2005 on December 08, 2005, 03:08:00 AM
holydemon im HIGHLY impressed if you can!!!!!!!!!!!!!!!!!!!!!!! ohmy.gif
Title: Disassembler For This Ibm Cpu ?
Post by: TheSpecialist on December 08, 2005, 07:57:00 AM
QUOTE(maddy2005 @ Dec 8 2005, 11:15 AM) View Post

holydemon im HIGHLY impressed if you can!!!!!!!!!!!!!!!!!!!!!!! ohmy.gif

Forget it, nobody can at the moment, there's just not enough info yet.
Title: Disassembler For This Ibm Cpu ?
Post by: Darren101 on December 10, 2005, 05:41:00 AM
One way to decrypt it.

Trial and error  laugh.gif