hi,

i suggest to use deep learning combined with machine learning models

Thanks

You may find this paper useful.:

Article A data mining based system for credit-card fraud detection in e-tail

In addition, You can use different supervised learning techniques like NN, RF, ensemble, stacked-ensemble/super learning, SVM and so forth. You can chose the appropriate model based on the problems (i.e. credit card fraud, email fraud, healthcare fraud detection) that you are trying to solve and the available data set.