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I am trying to reverse engineer / research a black box system, this is, a system for which there is no public information at all. Let's say the system is a modern handheld console.

I have already gathered the followed information and data:

• The system uses ARM processors and I know their revision (ARM9, and ARM11 exactly)
• The system has NX bit enabled (so it has a MMU I think). Aditionally, some critical applications run on the baremetal, while common user programs run on virtual memory
• RAM contents are unencrypted. Using a hardware set-up, I have memory dumps.

So, I have the memory dumps. What would be an efficient approach?

First I believe loading it with IDA (or r2) could be helpful. But I don't know how to set up a raw dump in IDA, do i have to load it manually? am i missing something?

Secondly. The dump is not encrypted. I can find strings, references to strings of programs that run in the system, etc... I guess I can also find code (like .text sections in PC but whatever are called in this system) which I should be able to reverse. Is this theory right? if so, how to put it in practice? how can I find pieces of code? I have tried entropy, which seems to be quite useful; code tends to have high entropy. Technically speaking, how would I load that code in IDA properly?

Everything is welcome

EDIT: Run binwalk over the ram dumps. Pretty interesting:https://gist.github.com/pedro-javierf/2476a1f4f0db72b785e414f77c273512

Whats The Lil Black Box Called.that U Hook Up And Get Apps Back

First I believe loading it with IDA (or r2) could be helpful. But I don't know how to set up a raw dump in IDA, do i have to load it manually? am i missing something?

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IDA directly handles raw image, all you have to do is specify the ARM little-endian [ARM] in the processor type.Once it's loaded, your first challenge is to identify the memory layout.

Secondly. The dump is not encrypted. I can find strings, references to programs that run in the system, etc... I guess I can also find code (like .text sections in PC but whatever are called in this system) which I should be able to reverse. Is this theory right? if so, how to put it in practice? how can I find pieces of code? I have tried entropy, which seems to be quite useful; code tends to have high entropy. Technically speaking, how would I load that code in IDA properly?

The information requires is to know what kind of dump do you have, if you dump memory from a vulnerability, or from a JTAG, or whatever. The layout might be different.

Few examples:

• If this is a raw dump, I would suggest to start with the address 0x0 and look for the Arm exception vector.
• If you dump it from a flash memory, you might find files embedded inside with binwalker.
• If there's a MMU, you could retrieve the page tables and recreate the virtual layout.
• You could look for strings which are used by open source software (e.g. u-Boot, linux, ...) and retrieve function pointers to start to reconstruct the image.
• And so on.

Hopefully you can provide further information about the target, that's sound interesting. :)

What's The Lil Black Box Called.that U Hook Up And Get Apps Free

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