A script of creating a file named "sc":
srk@srk:~/foo$ cat > sc
srk@srk:~/foo$ cat sc
srk@srk:~/foo$ echo *
srk@srk:~/foo$ ls -al
drwxr-xr-x 2 srk users 1024 Sep 15 12:27 .
drwxr-xr-x 63 srk users 5120 Sep 15 12:24 ..
ls also ignores directories called sc (not too surprising really)
Are you sure your system has not be compromised?
This works fine in my RH6.0 w/ fileutils-4.0-1.