LKM Trojan?

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When I run chkrootkit I get the following lines.

>Checking `lkm'... You have   107 process hidden for readdir command
>chkproc: Warning: Possible LKM Trojan installed

rkhunter doesn't seem to find anything.
I suspect that my machine might be compromised.
running "ls" in the /proc directory returns an empty list.
I have recompiled the kernel and world but the problem persists.
Any suggestions on how to fix this without having to reinstall from scratch?

TIA,
Tomoki