Comments (5)
Unfortunately it is all done by eye right now, as explained in my tutorial.
I suppose one could take the thumbnail image, if uncorrupted, and use it as a reference for alignment.
But even in this case it would be a very difficult task, as MCU's can be color shifted in addition to position shifted.
from jpeg-decomp.
Hi,
These file encrypted 153605 bytes from ransomware so when i cut from offset 153605 of encrypted and paste it to the last FFDA+12 Bytes the alligment not correct so i have plan to made a automate process to correct the MCU and color of batch JPEG
Sample:
https://drive.google.com/drive/folders/1e_C2lzBIEFfbZkR4vvr9_Nkdul1P0C-E?usp=sharing
when patch the corrupt jpeg to reference file we have 3 issue:
- wrong alligment like the image.jpg
- the bottom have non data because the first data encrypted so image become gray so how we remove it by mcu
- the color maybe wrong
If i remove byte from SOS of image the color when wrong and image fix alligment bit remove MCU is better
from jpeg-decomp.
You should not cut data arbitrarily; it's better to decompile the image and remove MCU's from the text file.
Still I don't know how all this could be automated; the eye and brain tell you where to cut.
from jpeg-decomp.
from jpeg-decomp.
As written in my tutorial, first decompile your image:
>jpeg-decomp -decode -fin image.jpg -fout image.txt
then load the image in JPEGsnoop and locate the MCU that you want to remove.
Go to the text file and remove or comment it.
Create a new image from the modified text file:
>jpeg-compiler -encode -fin image.txt -fout image.1.jpg
from jpeg-decomp.
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from jpeg-decomp.