Awesome
SharPyShell
<p align="center"><img src="logo.png" width="500" height="300" /></p> <hr/>SharPyShell is a tiny and obfuscated ASP.NET webshell that executes commands received by an encrypted channel compiling them in memory at runtime.
SharPyShell supports only C# web applications that runs on .NET Framework >= 2.0<br>VB is not supported atm.
Usage
python3 SharPyShell.py generate -p somepassword
python3 SharPyShell.py interact -u http://target.url/sharpyshell.aspx -p somepassword
Requirements
Python version >= 3.6
and
pip3 install -r requirements.txt
Description
SharPyShell is a post-exploitation framework written in Python that are capable of:
- Generate obfuscated webshell (generate);
- Simulate a windows terminal as an interaction for the webshell (interact).
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. <br> <br> 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. <br> 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. <br> <br> Moreover this framework aim to be stealthy as much as possible implementing in memory execution for c# code and powershell modules. <br> <br> The obfuscation implemented in SharPyShell aim to evade both file signatures and network signatures ids.<br> For the network signatures evasion, a fully encrypted channel has been developed for sending commands and receiving outputs.<br> The evasion for file signatures has been achieved using Reflection on a precompiled dll in charge of runtime compiling c# code.<br>
Technical Diagram
Generated with asciiflow.com
+-------------------------------------------+ +--------------------------------------------+
| SharPyShell Client (Local) | | Target Server (Remote) |
+-------------------------------------------+ +--------------+ +--------------------------------------------+
| | | Encrypted | | |
| +--------+-----------------^-----------<----> HTTP <---->-----------+-----------------^--------+ |
| | | | | Channel | | | | |
| |4-Receive |1-Send | +--------------+ | |2-Receive |3-Send |
| | | | | | | |
| +--------v-----------------+--------+ | | +--------v-----------------+--------+ |
| | Module | | | | Webshell URL | |
| +--------+-----------------^--------+ | | +--------+-----------------^--------+ |
| | |Parse |Generate| | | | |Parse |Generate| |
| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
| | |Base64 Resp | |Base64 Req | | | | | |Base64 Req | |Base64 Resp | | |
| | +------+------+ +------^------+ | | | | +------+------+ +------^------+ | |
| | |Decode |Encode | | | | |Decode |Encode | |
| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
| | |Xor/Aes Data | |Xor/Aes Data | | | | | |Xor/Aes Data | |Xor/Aes Data | | |
| | +------+------+ +------^------+ | | | | +------+------+ +------^------+ | |
| | |Decrypt |Encrypt | | | | |Decrypt |Encrypt | |
| | +------v------+ +------+------+ | | | | +------v------+ +------+------+ | |
| | |Response | |C# Code | | | | | |C# Code | |Output | | |
| | +------+------+ +------+------+ | | | | +------+------+ +------+------+ | |
| | | ^ | | | | | ^ | |
| | v | | | | | v | | |
| | +--------+--------+ | | | | +--------+--------+ | |
| | | | | | | | | |
| +---------------- ^ ----------------+ | | +---------------- ^ ----------------+ |
| | | | | |
| |Run&Parse | | |Compile&Run |
| | | | | |
| +------ v ------+ | | +------ v ------+ |
| |Terminal | | | |csc.exe | |
| +---------------+ | | +---------------+ |
| |Modules: | | | |System.dll | |
| |#exec_cmd | | | |Compile in Mem | |
| |#exec_ps | | | |No exe output | |
| |#runas | | | | | |
| |..... | | | | | |
| | | | | | | |
| +---------------+ | | +---------------+ |
| | | |
+-------------------------------------------+ +--------------------------------------------+
Modules
#download Download a file from the server
#exec_cmd Run a cmd.exe /c command on the server
#exec_ps Run a powershell.exe -nop -noni -enc 'base64command' on the server
#inject_dll_reflective Inject a reflective DLL in a new (or existing) process
#inject_dll_srdi Inject a generic DLL in a new (or existing) process
#inject_shellcode Inject shellcode in a new (or existing) process
#invoke_ps_module Run a ps1 script on the target server
#invoke_ps_module_as Run a ps1 script on the target server as a specific user
#lateral_psexec Run psexec binary to move laterally
#lateral_wmi Run builtin WMI command to move laterally
#mimikatz Run an offline version of mimikatz directly in memory
#net_portscan Run a port scan using regular sockets, based (pretty) loosely on nmap
#privesc_juicy_potato Launch InMem Juicy Potato attack trying to impersonate NT AUTHORITY\SYSTEM
#privesc_powerup Run Powerup module to assess all misconfiguration for privesc
#runas Run a cmd.exe /c command spawning a new process as a specific user
#runas_ps Run a powershell.exe -enc spawning a new process as a specific user
#upload Upload a file to the server
Windows version tested
Windows Server >= 2008 Standard x64