I had the same problem on my 2005 Malibu.  I brought it back to the
dealer and they replaced the steering rack.  It was covered under the
warranty and my problem was solved.  I was told by the dealer that
this is a common issue.

However, I did some research on the internet and asked some questions
and I have been told that a little grease where the steering column
meets the steering rack is all that is needed to remedy the problem.
So it seems that this is really a minor issue.  Also, the job can be
done by anyone that is handy with cars.  So basically, the dealer
wants to make the job into something bigger than it is as they just go
back and charge GM for the work.

It's a design defect of these cars.  The steering shaft and the
steering rack come together at an odd angle.  That causes the
rubbing.  I wouldn't worry too much about it.  I have an '05 Malibu
LS.

Justin

inttermediate steering shaft binding...remove pinch bolt at rack to
steering shaft connection....reach in and remove shaft from rack by
pushing towards steering wheel...pump it up and down several times (you
will feel the resistance of the grease inside as you redistribute
it......put everything back as you found it and your done for many a
thousand of mile.....it will return someday............repeat as
neccessary

Curious to know if this is a problem with the older Malibus as well,
1997-2000?  My 1998 clunks if I am turning to drive out the driveway or
turning very slowly.  Almost sounds like the noise a spring makes as it is
winding up.  I don't notice the noise at higher speeds.  I've been told the
problem is the strut mounts (not by mechanic, just suggestions from other
Chev owners), but I've never actually done anything other than spray oil
into the mounts to remedy the noise.

Thanks
Sharky