A new ransomware called RegretLocker uses a variety of advanced features that allows it to encrypt virtual hard drives and close open files for encryption.
RegretLocker was discovered in October and is a simple ransomware in terms of appearance as it does not contain a long-winded ransom note and uses email for communication rather than a Tor payment site.
When encrypting files, it will append the innocuous-sounding .mouse extension to encrypted file names.
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Source: Bleeping Computer