Cybereason has released a tool that tries to help users stay safe from ransomware infections. RansomFree can help users of Windows 7, 8 and 10, and Windows Server 2010 R2 and 2008 R2 PCs. It can detect when an abnormal encryption-heavy process starts (specific to ransomware families), on both the local computer and on shared and/or network drives. The downside is that the tool needs a short amount of time to detect the start of the encryption operations, meaning that a few of your files will be encrypted before Ransom free detects anything wrong.
Source: https://www.bleepingcomputer.com/news/security/ransomfree-is-the-latest-app-that-tries-to-stop-ransomware-infections-on-windows/