Just did
this excerpt of the contenets should day it all
Hello, dear friend
I have two news for you. Bad one and the bad one:
First, it seems that someone installed rootkit
on your system...
Second, is the fact that I can't execute (errno=%d)
original /sbin/init binary!
And reason why I am telling you this is
that I can't live without this file. It's just
kinda of symbiosis, so, boot from clean floppy,
mount root fs and repair /sbin/init from backup.

(and install me again, if you like :P)

Best regards,
your rootkit .. SoNkErIkI Say`s Have a nice day!
taken from the sk file in the tar