I expect this type of stuff to start happening more and more.
First establish a new coin, gain the trust of the community and get as many people as possible to install the wallet. The next step is to release an update to the wallet, which includes the virus. Because the community now trusts the coin, they download without thinking too much about it and get their systems infected.
Be happy for 2fa and stuff like that, but the best thing is to just avoid these new coins. I'm not for keeping many coins on an exchange, but any new alts, I never download the wallet anymore and just keep low amounts on the exchanges if I want to keep them. The risk is bigger to download the wallet than te keep them on the exchange in some cases..
If it's a new coin from an unknown dev it's safest to run it in a virtual machine like virtual box rather than risk installing it on your computer. If it's infected with a virus you can delete the virtual machine, and your computer stays virus free.