Keep your modded Xbox 360 offline or use a stealth server (like Proto or XBOnline) if you need Live access.
If you own an RGH/JTAG console and wish to download an MP GUI, follow these best practices: xbox 360 mp gui download
Just like downloading software on a PC, downloading an MP GUI from a random forum or YouTube link carries the risk of malware. While a virus cannot infect the Xbox 360 operating system, malicious modders often package "RATs" (Remote Access Trojans) or "KV stealers" inside the menu files. These scripts can steal your "Keyvault" (KV)—a unique ID file that allows the console to connect to Xbox Live—and sell it to other modders. This can get your console permanently banned from Xbox servers. Keep your modded Xbox 360 offline or use