mirror of
https://github.com/antonioCoco/SharPyShell
synced 2026-06-08 13:11:44 +00:00
antonioCoco
152 lines
9.6 KiB
Markdown
152 lines
9.6 KiB
Markdown
# SharPyShell
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SharPyShell is a tiny and obfuscated ASP.NET webshell that executes commands received by an encrypted channel compiling them in memory at runtime.
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SharPyShell supports only C# web applications that runs on .NET Framework >= 2.0<br>VB is not supported atm.
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## Usage
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```
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python SharPyShell.py generate -p somepassword
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python SharPyShell.py interact -u http://target.url/sharpyshell.aspx -p somepassword
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```
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## Requirements
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Python version >= 2.7
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and
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```
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pip install -r requirements.txt
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```
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## Description
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SharPyShell is a post-exploitation framework written in Python that are capable of:
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- Generate obfuscated webshell (generate);
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- Simulate a windows terminal as an interaction for the webshell (interact).
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The main aim of this framework is providing the penetration tester a series of tools to ease the post exploitation phase once an exploitation has been succesfull against an IIS webserver.
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<br>
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<br>
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This tool is not intended as a replacement of the frameworks for C2 Server (i.e. Meterpreter, Empire, ecc..) but this should be used when you land to a fully restricted server where inbound and outbound connections are very limited.
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<br>
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In this framework you will have all the tools needed to privesc, netdiscovery and lateral movement as you are typing behind the cmd of the target server.
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<br>
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<br>
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Moreover this framework aim to be stealthy as much as possible implementing in memory execution for c# code and powershell modules.
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<br>
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<br>
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The obfuscation implemented in SharPyShell aim to evade both file signatures and network signatures ids.<br>
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For the network signatures evasion, a fully encrypted channel has been developed for sending commands and receiving outputs.<br>
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The evasion for file signatures has been achieved using Reflection on a precompiled dll in charge of runtime compiling c# code.<br>
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## Technical Diagram
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Generated with asciiflow.com
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```
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+-------------------------------------------+ +--------------------------------------------+
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| SharPyShell Client (Local) | | Target Server (Remote) |
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+-------------------------------------------+ +--------------+ +--------------------------------------------+
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| | | Encrypted | | |
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| +--------+-----------------^-----------<----> HTTP <---->-----------+-----------------^--------+ |
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| | | | | Channel | | | | |
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| |4-Receive |1-Send | +--------------+ | |2-Receive |3-Send |
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| | | | | | | |
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| +--------v-----------------+--------+ | | +--------v-----------------+--------+ |
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| | Module | | | | Webshell URL | |
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| +--------+-----------------^--------+ | | +--------+-----------------^--------+ |
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| | |Parse |Generate| | | | |Parse |Generate| |
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| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
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| | |Base64 Resp | |Base64 Req | | | | | |Base64 Req | |Base64 Resp | | |
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| | +------+------+ +------^------+ | | | | +------+------+ +------^------+ | |
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| | |Decode |Encode | | | | |Decode |Encode | |
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| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
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| | |Xor/Aes Data | |Xor/Aes Data | | | | | |Xor/Aes Data | |Xor/Aes Data | | |
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| | +------+------+ +------^------+ | | | | +------+------+ +------^------+ | |
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| | |Decrypt |Encrypt | | | | |Decrypt |Encrypt | |
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| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
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| | |Response | |C# Code | | | | | |C# Code | |Output | | |
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| | +------+------+ +------+------+ | | | | +------+------+ +------+------+ | |
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| | | ^ | | | | | ^ | |
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| | v | | | | | v | | |
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| | +--------+--------+ | | | | +--------+--------+ | |
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| | | | | | | | | |
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| +---------------- ^ ----------------+ | | +---------------- ^ ----------------+ |
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| | | | | |
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| |Run&Parse | | |Compile&Run |
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| | | | | |
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| +------ v ------+ | | +------ v ------+ |
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| |Terminal | | | |csc.exe | |
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| +---------------+ | | +---------------+ |
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| |Modules: | | | |System.dll | |
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| |#exec_cmd | | | |Compile in Mem | |
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| |#exec_ps | | | |No exe output | |
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| |#runas | | | | | |
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| |..... | | | | | |
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| | | | | | | |
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| +---------------+ | | +---------------+ |
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+-------------------------------------------+ +--------------------------------------------+
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```
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## Modules
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```
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#download Download a file from the server
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#exec_cmd Run a cmd.exe /c command on the server
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#exec_ps Run a powershell.exe -nop -noni -enc 'base64command' on the server
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#invoke_ps_module Run a ps1 script on the target server
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#invoke_ps_module_as Run a ps1 script on the target server as a specific user
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#lateral_psexec Run psexec binary to move laterally
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#lateral_wmi Run builtin WMI command to move laterally
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#mimikatz Run an offline version of mimikatz directly in memory
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#net_portscan Run a port scan using regular sockets, based (pretty) loosely on nmap
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#privesc_juicy_potato Launch Juicy Potato attack trying to impersonate NT AUTHORITY\SYSTEM
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#privesc_powerup Run Powerup module to assess all misconfiguration for privesc
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#runas Run a cmd.exe /c command spawning a new process as a specific user
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#runas_ps Run a powershell.exe -enc spawning a new process as a specific user
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#upload Upload a file to the server
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```
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## Windows version tested
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Windows Server 2019 Standard<br>
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  OS Name: Microsoft Windows Server 2019 Standard Evaluation<br>
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  OS Version: 10.0.17763 N/A Build 17763<br>
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<br>
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Windows Server 2016 Standard<br>
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  OS Name: Microsoft Windows Server 2016 Standard Evaluation<br>
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  OS Version: 10.0.14393 N/A Build 14393<br>
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Windows Server 2012 R2 Standard<br>
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  OS Name: Microsoft Windows Server 2012 R2 Standard<br>
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  OS Version: 6.3.9600 N/A Build 9600<br>
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Windows server 2012 Standard<br>
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  OS Name: Microsoft Windows Server 2012 Standard Evaluation<br>
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  OS Version: 6.2.9200 N/A Build 9200<br>
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Windows Server 2008 R2 Standard<br>
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  OS Name: Microsoft Windows Server 2008 R2 Standard<br>
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  OS Version: 6.1.7601 Service Pack 1 Build 7601<br>
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Windows Server 2008 Standard x64<br>
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  OS Name: Microsoft© Windows Server© 2008 Standard <br>
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  OS Version: 6.0.6001 Service Pack 1 Build 6001<br>
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Windows Server 2003 Standard x64 (partial working)<br>
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  OS Name: Microsoft(R) Windows(R) Server 2003 Standard x64 Edition<br>
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  OS Version: 5.2.3790 Service Pack 2 Build 3790<br>
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## Credits
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<ul>
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<li><a href="https://github.com/epinna/weevely3">@weevely3</a></li>
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<li><a href="https://github.com/ohpe/juicy-potato">@juicy-potato</a></li>
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<li><a href="https://github.com/PowerShellMafia/PowerSploit">@PowerSploit</a></li>
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<li><a href="https://github.com/gentilkiwi/mimikatz">@mimikatz</a></li>
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</ul>
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