A FraudTool is a standalone malware computer program that pretends to be a well-known program, or a non-malicious one (such as an Antivirus), in order to steal confidential data or to receive money. These malware have also, inside them, adware functionality.
A Rogue-Antivirus is a FraudTool that fakes to be an Antivirus, once installed on a user's computer, pretends to find one or more computer viruses and/or malware. Obviously, the FraudTool does not perform a real scan, and then the computer can be absolutely clean. Once it has reported the presence of these hypothetical malware, the FraudTool usually proposes for the user to buy a theoretical paid version to clean the computer. Obviously, there is no paid version, and once users provide their credit card data and complete the transaction, they do not have access to any paid version.