Welcome to the community. 
Sorry to hear you’re having an issue. However, we have not recently received any similar reports of this from our millions of active users, this is the only one recently.
This error message is not from WeMod.
Your error message gives you three reasons why the game might not be working (corruption, virus or cracked). So I’m not sure why you’re focusing on one of those three reasons, maybe it is or possibly was cracked in the past after all? 
We get it, maintaining a gaming habit is expensive these days, so some people decide to go down the unlawful route, but still, we can’t support it ourselves, we are a law-abiding business.
If your game is cracked (including if you’re using a save file from a cracked game on a purchased copy), then there’s nothing WeMod can do for you. This thread explains why (click).
As the error states, it’s also possible that your game is corrupted. Corruption happens on Windows machines for absolutely no reason, completely randomly, and at no fault to yourself or anyone else other than Microsoft. The solution here would be to either restore the integrity of the game files (Google will provide instructions in seconds), or delete and reinstall the game.
This error is also potentially caused by your antivirus suddenly deciding to block something. Add both the game and WeMod files as an exception in your antivirus program (just in case - before you say “I don’t have an antivirus” - you do. Windows Defender is an antivirus and it is on every PC and cannot be removed as it is embedded permanently into the operating system).
And do a deep virus scan of your PC. I’d also recommend getting MalwareBytes to run alongside your antivirus, as antiviruses tend to not be as good at detecting malware as they are with viruses.
You might also be banned for trying to cheat in multiplayer modes. Having not played Raft before, I’m not sure if there is multiplayer or not. In this case, you’ll need to contact the game developers and politely apologise/grovel.