Hello there. 
This is called a false positive. You will experience this with trainers every now and again no matter where you get them from. It is triggered because of how trainers work, which is by injecting values into your PC’s RAM. It is perfectly harmless. It makes no sense for the largest and most popular trainer provider on the internet (WeMod) to distribute trojans to customers.
Please use the search button before posting as this has already been addressed multiple times. For example, this thread explains in clearer detail why it happens and how to resolve it: My antivirus marked WeMod as a Trojan - #2 by Ravenfyre.