Initial commit

Author: Wintermute

LICENSE

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+MIT License
+
+Copyright (c) 2018 Jakub Lutczyn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+<h1 align="center"> Shellab </h1> 
+<h5 align="center"> Linux and Windows shellcode development/enrichment utility </h5> 
+<p align="center">
+  <a>
+    <img alt="Shellab" title="Shellab" src="flask.png" width="380" height="450">
+  </a>
+</p>
+
+
+## Table of Contents
+- [Introduction](#introduction)
+- [Requirements](#requirements)
+- [Features](#features)
+- [Future improvements](#future improvements)
+- [Example usage](#example usage)
+- [Screenshots](#screenshots)
+- [Contribution](#contribution)
+- [License](#license)
+
+
+## Introduction
+Shellab is a tool that can be used to improve existing shellcodes and adapt them for personal needs. Developed to provide an alternative to msfvenom with new functionalities. Suitable for both Windows and Linux shellcode (32 and 64 bit). 
+
+## Requirements
+Shellab requires Radare2, you should to install it running this command:
+`$ sudo apt-get install radare2`
+
+## Features
+
+* Encode shellcode with custom encoder 
+
+* Generate stagers and egghunters (including [sandwich](https://www.securitysift.com/eggsandwich-egghunter-integrity/) and [omelette](http://www.thegreycorner.com/2013/10/omlette-egghunter-shellcode.html) egghunter)
+* Inject shellcode into PE files
+* Run shellcode on Linux
+* Remove bad characters and null-bytes
+* Perform experimental size reduction (by instructions replacement)
+* Export shellcode in different executable formats (C, C#, Python, Powershell, hex, raw etc.)
+* Add custom instructions, NOP slides and specific system calls
+
+## Future improvenemts
+- [ ] Create more encoders
+- [ ] Implement generation of fully alphanumeric shellcode
+- [ ] Add shellcode comparison mechanism
+
+
+##Example usage
+This example will encode the input shellcode with "rot_xor" encoder, insert "xor eax, eax" instruction and 100 non-canonical NOP instructions in front of it, generate a bind stager (that will listen for the incoming shellcode on port 4444) and prepend the shellcode with exit() syscall.
+######Show help message:
+<img src="screenshots/help_screenshot.png" width="600"/>
+######List available components:
+<img src="screenshots/list_screenshot.png" width="600"/>
+######Generate the shellcode:
+<img src="screenshots/example.png" width="600"/>
+
+
+
+
+##Contribution
+If you have an idea for a new encoder, egghunter or stager, or just want to improve this tool, simply create a pull request :)
+
+## License
+This software is under [MIT License](https://en.wikipedia.org/wiki/MIT_License)

encoders/__init__.py

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+__all__ = ["single_incr"]

encoders/__init__.pyc

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+#!/usr/bin/python2.7
+
+class Encoder:
+	name = 'ff_substract'
+	description = 'Substracts value of each instruction from 0xff'
+	arch = 'x86'
+	rank = 'manual'
+	def encode(self, payload):
+		def stub():
+			stub = "\xeb\x0d\x5e\x8a\x1e\x80\xf3\xff\x74\x0a\x88\x1e\x46\xeb\xf4\xe8\xee\xff\xff\xff"
+			return stub
+		encoded = ''
+		for char in bytearray(payload):
+			char = 0xff - char
+			encoded += chr(char) 
+		return encoded + '\xff', stub()

encoders/ff_substract.py

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+#!/usr/bin/python2.7
+import random 
+
+class Encoder:
+	name = 'rot_xor'
+	description = 'Add a random number to every byte and xor with previous one'
+	arch = 'x86'
+	rank = 'excellent'
+	def encode(self, payload):
+		number = random.choice(range(1,255))
+		key = random.choice(range(1,255))
+		opcode = []
+		opcode.append(number)
+		encoded = ''
+		index = 0
+		def stub():
+			stub = "\xeb\x1c\x5e\x31\xc0\x31\xdb\x31\xc9\xb1\x16"
+			stub += "\xb0\x66\xb3\x2a\x8a\x16\x30\xd0\x88\x06\x28"
+			stub += "\x1e\x88\xd0\x46\xe2\xf3\xeb\x05\xe8\xdf\xff\xff\xff"
+			return stub
+		for char in bytearray(payload):
+			byte = (char + key) % 256
+			byte = byte ^ opcode[index]
+		return encoded, stub() 

encoders/ff_substract.pyc

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+#!/usr/bin/python2.7
+
+
+class Encoder:
+	name = 'single_incr'
+	description = 'Single incrementation encoder'
+	arch = 'x86'
+	rank = 'good'
+	def encode(self, payload):
+		def stub():
+			stub ="\x32\xc1\x32\xdc\x32\xca\x32\xd3"
+			stub +="\xb3\x0a\x6b\x0b\x69\x75\x69\x62"
+			stub +="\x6f\x69\x6b\x70\x6f\x62\x8a\xe2"
+			stub +="\xb4\x02\xb1\x05\xce\x81\x32\xdc"
+			stub +="\xb1\x02\xce\x81"
+			return stub
+		encoded = ''
+		for char in bytearray(payload):
+			char += 1
+			encoded += chr(char) # It was chr(char)
+		return encoded, stub()
+