There is no more to say than what we see in the title of this article, unofficial downloads are a problem for users who continue to think that payment applications downloaded from the Internet are a good option. In this case, the malware detected has been baptized as "Patcher" and what it does specifically is to keep itself hidden in the cracks of the downloaded applications and once we run the application what it does is encrypt the files so that users have to pay an amount of bitcoins (yes the virtual currency) to receive the unlock code in a week or in hours. Although they pay for the codes, they will never arrive and the files encrypted by this malware can be considered lost.
Obviously, paying with bitcoin is not widespread and not all users have access, but those who have access to this currency have to pay approximately 250 euros to decrypt the files once they have the malware installed on the Mac. In this case, the malware circulates on BitTorrent and Marc-Etienne M.Léveillé has been in charge of locating and making public this malware that It is developed with Swift in a very rudimentary way and little worked but not for that reason ineffective.
The best thing is to stay away from unofficial software for issues like this, and there are more and more cases in which they are detected malware in pirated applications or those applications to generate codes application license that we find on the net. In this case, it has been detected in Office 2016 for Mac and Adobe Premiere Pro CC 2017, but of course this type of malware can appear when you least expect it.