More than half million computers in more than dozens of countries were infected by this sophisticated malware that has been sold on underground forums since at least 2010 to several thousands people. Blackshades is a remote administration tool (RAT) and is sold legally around the world. Bad intention actors are using the tool as a malware for collecting private information of innocent users, including usernames and passwords for email and Web services, instant messaging applications, FTP clients and lots more. In 2012, while a very serious and bloody internal war between the government and the opposition forces, the BlackShades RAT was also used to infect and Spy on Syrian activists.
Source: https://thehackernews.com/2014/05/fbi-arrests-100-hackers-linked-to_19.html