New ransomware OphionLocker uses elliptic curve cryptography
The new ransomeware first discovered by @Trojan7Sec. Once it encrypts all the data on your system then you would see the following message.
It also adds a text file on your desktop with the details of making the payment and collecting the decryption key.
The payment website looks like below
Ransom Page
Fake Ransom
This ransomware does not securely delete your files or remove the shadow volume copies so it is still possible to recover your files using a file recovery tool or a program like Shadow Explorer.
More information on this can be found @trojan7malware.blogspot.co.uk