I dont know if it is virus, but i didnt get a virus from it, so check virustotal!
Ok so here is what you have to do:
1. Open Call of Duty 4 - Multiplayer
2. Make a new account
3. Alt+Tab out of game
4. Open EasyAccount.exe (it is the hack)
5. Click on the version your Call of Duty 4 is and click: "Easy Upgrade"
6. Go back in game
7. Notice that you have all the weapons+everything else!!
8. YOU HAVE TO PLAY A GAME OR 2, OTHERWISE IT WILL RESET!(your rank)!
9. Enjoy your fully rank 55 account + plus all weapons and challenges
WARNING:
This is detected! Rename your pb folder to something else or your CD key WILL be banned