Imagination caused by a legendary Trojan

A few days ago, a friend called and said that he had a legendary Trojan Horse on his machine. The legendary ID was stolen and asked me to find a time to help him clear it. I remember that some Trojans cannot be found using anti-virus software. Only the startup items can be seen. Later, I thought that if I locked the Registry, would I still be lucky? I never did a test, and I don't know much about it. I wonder if you have any research on this trojan. I have read a trojan before. ProgramAnalysis, http://www.aspcool.com/lanmu/browse1.asp? Id = 966 & bbsuser = CSHARP, This is a method, but most of the methods are to bundle Trojans in the image, open the image while recruiting, or open the web page while writing to the client.
In the past, a netizen sent me a record of the stolen legendary ID, which was recorded in great detail. The game ID, password, role name, game profession, and game grade were recorded.