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 Post subject: RayCity .JMD Files
PostPosted: Tue May 15, 2018 10:03 pm 

Joined: Tue May 15, 2018 10:00 pm
Posts: 2
Hey Guys,

i wanted to ask if anyone has a script to unpack .JMD Files. I would be very thankful.

I attached the file as example.

Regards, Luke3107


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207r.rar [931.49 KiB]
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 Post subject: Re: RayCity .JMD Files
PostPosted: Tue May 15, 2018 10:20 pm 
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Joined: Wed Jul 30, 2014 9:32 pm
Posts: 9077
There is an unicode magic: "J2m Data Format 1.0"
The data looks partially obfuscated, for example from offset 0x80 till 0x2ae0 and some other subsequent blocks.
It's strange the presence of "IEND" without the "PNG" header which means the file is partially encrypted.
All the DDS files are in clear text so you can dump them with a file ripper.


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 Post subject: Re: RayCity .JMD Files
PostPosted: Tue May 15, 2018 10:46 pm 

Joined: Tue May 15, 2018 10:00 pm
Posts: 2
Thanks for the fast answer and i got the .DDS Files. but there are also 3D Models inside, can u somehow extract them even when its encrypted?

Regrads, Luke


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 Post subject: Re: RayCity .JMD Files
PostPosted: Wed May 16, 2018 3:55 pm 
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Joined: Wed Jul 30, 2014 9:32 pm
Posts: 9077
no, I didn't see a way to guess/crack the obfuscation. It's necessary reverse engineering but I don't know if someone is interested in doing it.


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