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ls from the Shell mode?
In many systems, ls is aliased to ‘ls --color’, which
prints using ANSI color escape sequences. Emacs version 21.1 and
later includes the ansi-color package, which lets Shell mode
recognize these escape sequences. In Emacs 23.2 and later, the
package is enabled by default; in earlier versions you can enable it
by typing M-x ansi-color-for-comint-mode in the Shell buffer, or
by adding (add-hook 'shell-mode-hook
'ansi-color-for-comint-mode-on) to your init file.
In Emacs versions before 21.1, the ansi-color package is not
included. In that case, you need to unalias ls for interactive
shells running in Emacs; this can be done by checking the EMACS
variable in the environment.