If you get the crack from a reputable source, you can trust it will be safe. A low seed torrent from a shady place (like The Pirate Bay) is probably a virus. High seed torrent from another source like 1337x or something with more active moderation is generally safe.
If you want to be extra sure, spin up a VM and install the crack there and check it out before doing it on your real machine.
I just set mine up to be as close to RIF as possible. I love it so far.