How ISIS is funded by black-market oil trading, illegal drugs and internet cafes
"Unlike the core al-Qaeda terrorist network, ISIS gets only a small share of funding from deep-pocket donors and therefore does not depend primarily on moving money across international borders.In its most recent report on ISIS’s funding, RBSS outlines ten ways the militants fund their crusade to create a Muslim caliphate.

The group claims that ISIS and the Syrian government has struck a secret deal which enables the militants to sell electricity and gas to the Assad regime."