BlackShades Crypter a/k/a SilentShades was spotted late last month by a researcher that goes by the name Jack. The malware is targeting users in the U.S. and Russia. Once infected it encrypts users files with an extension, in this case silent.silent The ransomware encrypts everything it comes across, including downloads, documents, pictures, music, and desktop folders, to name a few. One string, after its decoded from Russian, reads: you can not hack me, I am very hard
Source: https://threatpost.com/blackshades-ransomware-targets-us-russians-teases-researchers/118473/