[CentOS] C5 : Deleting un-deletable files ?

Sun Sep 14 18:59:00 UTC 2014
Bill Campbell <centos at celestial.com>

On Sun, Sep 14, 2014, Always Learning wrote:
>Thank you to Steven and to Valeri for an excellent idea.
>The fsck cured the problem.  The problem files were removed by fsck
>during its recovery/rectification.

The first thing you should do when you find files or directories
is use 'lsattr' to check the attributes.  In particular look for
the 'i' attribute which marks the entry as immutable.  A favorite
trick of crackers is to put their own versions of commands such
as /bin/ps, /bin/ls, /usr/bin/find, etc. to hide their activity.

You can use the 'chattr' command to change the attributes with
something like 'chattr -i /bin/ps' to remove immutable attribute.
If there are multiple attributes shown by the 'lsattr' command,
simply add them like 'chattr -iAs /bin/ps'.  It also takes the -R
option to run recursively through a directory.

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