Intelligence sources in the West claim that ISIS members are increasing their financial resources, which will eventually lead to terrorist attacks. Most of the money is transferred to terrorists from the European continent. 

Authorities in the United States estimate that ISIS has about $300 million and that the proceeds go mainly through kidnappings, robberies, smuggling and human trafficking.

Another important source of income is digital currencies. In Iraq and Syria, the organization pockets millions of dollars a month Owners of factories and businesses in areas over which the central government has lost control.