I have folders that were infected with the Crypt v2 (I believe)/ .crypt ransomware infection. In any case, after matching a couple of good files with the encrypted ones I managed to decrypt quite a bit (say, 65% at least). I used the TrendMicro tool as well as the Kaspersky. In any case, I have directories where if I have 50 pictures (.jpg) in some cases anywhere from 20 - 30 were successfully decrypted while the others weren't at all. In other folders it's only a few while the rest remain encrypted.
I also have some larges files (.avis and .mp4s for example) that were not decrypted at all. I noticed that most excel documents and word documents were decrypted as well as .pdf.
Did I miss something? Do I need a better clean matching file? I thought that they'd all have the same encryption key/algorithm and thus everything would be decrypted altogether.
Any advice, help or suggestions would be greatly appreciated!