In September 2014, Doctor Web's security experts researched several new threats to Mac OS X. One of them turned out to be a complex multi-purpose backdoor that entered the virus database as <a href="Mac.BackDoor.iWorm.">http://vms.drweb.com/search/?q=Mac.BackDoor.iWorm">Mac.BackDoor.iWorm. Criminals can issue commands that get this program to carry out a wide range of instructions on the infected machines. A statistical analysis indicates that there are more than 17,000 unique IP addresses associated with infected Macs.