Quoting Colm MacCarthaigh (colm at stdlib.net):
> From the original post:
>> "find tells me that /sbin/init was changed, and /usr/lib/.ss/sk was installed."
>> Very much looks like a rootkit.
OK, so trying to figure out the fine details of what's wrong with the
installed software is basically repairing the deck chairs on the
Titanic. You already know what's basically wrong with the system: It's
been rooted. Time to cut your losses and rebuild. Don't forget to
reissue all new passwords to the users, and warn them under pain of
gruesome death not to reimplement their old ones.
All the standard recovery-from-root-compromise recommendations apply:
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