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Tools for Red Star OS (붉은별)

This repository includes several binaries from and tools for Red Star OS. These can be used for further research work.

Disable malicious components

The easiest way is to run the script on Red Star OS 3.0 Desktop (requires root privileges).

Manual steps

  1. Get root privileges via /usr/sbin/rootsetting

  2. Disable SELinux

    SELinux protects several files an directories (e.g. /var/log). It should be disabled in order to make changes to some parts of the system.

     setenforce 0

    In order to keep SELinux disabled after rebooting, append selinux=0 to the kernel line in the GRUB config file (/boot/grub/grub.conf).

  3. Kill securityd

    Killing securityd will prevent the system from rebooting when editing/deleting various protected files.

     killall -9 securityd
  4. Disable rtscan kernel module

    Either via (see rtscan) or via a Python shell as follows:

     [root@localhost ~]# python
     Python 2.6 (r26:66714, Oct  7 2012, 13:39:47)
     [GCC 4.4.0 20090506 (Red Hat 4.4.0-4)] on linux2
     Type "help", "copyright", "credits" or "license" for more information.
     >>> import fcntl
     >>> fcntl.ioctl(open('/dev/res', 'wb'), 29187)

    After disabling rtscan protected processes like opprc will become killable.

  5. Kill scnprc and opprc

     killall scnprc
     killall opprc
  6. Replace /usr/lib/

    See libos for further information. Replacing this file will prevent the system from rebooting via securityd after rebooting the system. It also will prevent reboot loops by kdm rendering the system unusable.

  7. Delete /usr/share/autostart/scnprc.desktop

    Deleting this file will prevent kdeinit from starting the framework after a system reboot.

  8. Delete /etc/init/ctguard.conf

    Deleting this file will prevent init from starting opprc even when scnprc is not running.

  9. Reboot the system


Prepare building environment

The default installation of Red Star OS 3.0 Desktop does not include GCC but the ISO includes the required packages.

  1. Insert the Red Star OS ISO into the system

  2. Go to /media/RedStar\ Desktop\ 3.0/RedStar/RPMS

  3. Install the following packages:

     yum localinstall glibc-headers-2.10.1-2.i386.rpm
     yum localinstall glibc-devel-2.10.1-2.i386.rpm
     yum localinstall ncurses-devel-5.6-0.rs3.0.i386.rpm
     yum localinstall gcc-4.4.0-4.i386.rpm

Now it is possible to build a recent (e.g. the latest) version of GDB for better debugging.

Install non-stripped threading libraries

The default installation of Red Star OS 3.0 Desktop does not allow to debug threads with the shipped version of GDB in e.g. scnprc and opprc because the required library is stripped.

Use the and libraries from the glibc-2.10.1-2.i686.rpm package of Fedora 11.


All of the information is based on research dedicated to analyzing Red Star OS. The authors take no responsibility for the accuracy, completeness or quality of the information provided.