Using any third-party modification to gain an advantage is a violation of Steam's terms and will likely lead to a permanent VAC ban.
Files distributed as .rar archives on third-party sites frequently contain malware or password-stealers. Security analysis tools like Hybrid Analysis often flag versions of these injectors as suspicious. Final Verdict CSGhostV3.rar
It acts as a manual map injector, which "injects" code into the game process to enable features like wallhacks or aimbots. Using any third-party modification to gain an advantage