Wikipedia
Blackshades
Blackshades is the name of a malicious trojan horse used by hackers to control computers remotely. The malware targets computers using Microsoft Windows-based operating systems. According to US officials, over 500,000 computer systems have been infected worldwide with the software.
In 2014, the United States Federal Bureau of Investigation (FBI) arrested one hundred people who had Blackshades in their computer. Before the FBI crackdown, Blackshades was sold for US$40, and reportedly generated US$350,000 in sales.