Never disable your antivirus to run a file you downloaded from an unknown source. Use tools like VirusTotal to scan the file before opening it.
A program designed to modify game memory to allow for cheats like infinite health or money.
If the archive requires a password (often provided in a separate .txt file or on a suspicious website), it is likely designed to hide its contents from being scanned by your antivirus software.
If you extract the RAR and find an .exe file inside that you weren't expecting, do not run it.