Knark

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Knark is a rootkit for the Linux kernels 2.2 and 2.4. It is a Loadable kernel module that uses system call redirection to hide its presence as well as providing other functions, like typing 'rootme /bin/sh' to get a root shell.

Knark is named after a Swedish and Norwegian slang term for "illegal drugs" or "narcotics".

In programming, 'knark' is sometimes used as a metasyntactic variable, like foo or bar.