It is known a priori that financial resources are the vital force to keep active terrorist groups and a determining factor in the extent of their actions.From this observation, control and monitoring of financial transactions has intensified within the framework of the United Nations and the financing of terrorism was included as one of the duties of the Financial Action Task Force (FATF), an international body linked to the UN, responsible for identifying and neutralizing money laundering actions beyond the monitoring of faithful compliance by Member States, the 40 recommendations of the GAFI/FATF and nine Special Recommendations created in 2004.In this context, the role of information technology has become relevant in particular transfers online when sent to tax havens, keeping guaranteed the confidentiality of the source, which complicates the origin and nature of assets and leverages the use of these technologies.In Brazil, despite the complexity of the issue, external pressures from GAFI/FATF for the adoption of an anti-terrorism and criminalizing its financing resulted in a legislation with some inconsistencies, broad and indeterminate concepts that threatens its effectiveness.