Yes, it is possible. But there is a risk that some files will be corrupted. Once you identify the ransomware action on the system, disconnect the device from the internet, this will break the group communication with the malware, some ransomware can continue encryption even without internet access.
You can also initiate antivirus countermeasures to isolate the malware and delete it, if the antivirus has not been disabled by the ransomware.
Stopping the encryption is extremely difficult, the ransomware is designed to disable any system or user countermeasures, decreasing the chances of the process being interrupted.
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