This is material hack. It's undetectable by VAC which scans only .exe and .dll files. VAC kicks in when you are joining protected server, material hack kicks in on game init. If you get banned, it's just because you are using wh like those built-in bots (seriously, look at them ) and get reported by someone. Also, if you hacked long time ago, you can get banned now.
By the way, if someone wants a ,,pants wh", here it is. I've just removed head and upperbody files from ZeroCool's .vpk (warning! it contains thousands of trojans packed in non-executable file...)
Scans:
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