Copy the characters and look for an online translator to paste them into: May be Chinese but I am truly not recognizing the characters.
No way to know what might happen if I do some copy and paste via my system....
If your system is indeed infected then doing your own translation search is moot.
And please list "all possible ways" that you tried; e.g., what specific AV applications did you try?
Are you able to post an image of the Window that appears regarding "permission"?
Might even be some encryption - translates to a password you are looking for....hmmm?