rm: Permission Denied (as root)

I was recently hacked. I try to find and delete all scripts they somehow upload it in /var/tmp and /tmp directories....
I tought I had clean them all until I run chkrootkit and found out some malicious files in /usr/lib/libsh/.owned/

I tryed to # rm -Rf /usr/lib/libsh/.owned/

But it returns: "rm: cannot remove directory '/usr/lib/libsh/.owned/' : Permission Denied"

I am runing rm as root......

Anyone knows how to delete it ?

 

 

 

 

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