WannaCry recovery

Hello, 

A friend was affected by wannacry ransomware. 
Is it possible, using hashcat to recover the key used by the ransomware to cipher files. 

It appears that file which are same unciphered look the same when ciphered meaning no salt. 
It also seems to be AES 128. 

But which methodology should be the good one ? 

I have access to hundreds of RTX4090 to do the job if computational power matters. 

Thanks