I have never installed a fake version, so i don't know wether malwarebytes will pick it up, however they are well aware of the problem and even know the hashes of some of the fake binaries... So i'd be supprised if they didn't scan for them...

https://blog.malwarebytes.com/cybercrime/2019/04/electrum-bitcoin-wallets-under-siege/

This being said, since electrum is completely open sourse, a malicious person can spin up hundreds of variants in no-time, so i wouln't rely on malwarebytes completely