cgsecurity.org

One could maybe use deleted files recovered from the disk of the same pc, as an 'unmodified jpg from the same camera'

tried with https://github.com/matwachich/recover_jpeg, which compares damaged files with unmodified jpgs, but did not have much success so far.

I had some success with the program I mentioned before. Without the need for the unmodified jpeg from the same camera. About 50% success. If the picture is bigger, the chances are better to recover the picture. The program name was deleted from my first post.

I looked at the github, trying to find ...

Not necessarily decrypt them, but recover part of jpeg that is not overwritten.
The way that this ransomware works, is to encrypt part of the file, about 150kb at the beginning of the file apparently, and saves the modified file as jpeg.

The rest of the jpeg file is untouched, and could be ...

here are the encrypted files, if someone wishes to try and repair them, or create a program.
https://1drv.ms/u/s!AoaKwmm7ZUPLaUkDl5y ... I?e=Yusf58
Apparently "The encrypted part is often 153605 bytes"

Ok, perhaps I did not explain properly.
A friend of mine installed program with virus.
His pictures got encrypted with ransomware.
Jpeg files got encrypted. First part of the image got encrypted, and the jpeg file got renamed to olfg.
For example "house.jpg" becomes "house.jpg.olfg."
It cannot be ...

I deleted your post because it appears to me as a fake case just to promote some software.
If I had a particular JPEG issue I would try

www.disktuna.com

which is not priced as high as USD 30,- for 30 days of use - the software you are referring to.
I have not used this software but would be ...