Kali Linux

laZzzy : Shellcode Loader, Developed Using Different Open-Source Libraries, That Demonstrates Different Execution Techniques

laZzzy is a shellcode loader that demonstrates different execution techniques commonly employed by malware. laZzzy was developed using different open-source header-only libraries.

Features

  • Direct syscalls and native (Nt*) functions (not all functions but most)
  • Import Address Table (IAT) evasion
  • Encrypted payload (XOR and AES)
    • Randomly generated key
    • Automatic padding (if necessary) of payload with NOPS (\x90)
    • Byte-by-byte in-memory decryption of payload
  • XOR-encrypted strings
  • PPID spoofing
  • Blocking of non-Microsoft-signed DLLs
  • (Optional) Cloning of PE icon and attributes
  • (Optional) Code signing with spoofed cert

How to Use?

Requirements:

  • Windows machine w/ Visual Studio and the following components, which can be installed from Visual Studio Installer > Individual Components:
    • C++ Clang Compiler for Windows and C++ Clang-cl for build tools

ClickOnce Publishing

  • Python3 and the required modules:
    • python3 -m pip install -r requirements.txt

Options

(venv) PS C:\MalDev\laZzzy> python3 .\builder.py -h

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣤⣤⣤⠀⢀⣼⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠀⠀⢀⣀⣀⡀⠀⠀⠀⢀⣀⣀⣀⣀⣀⡀⠀⢀⣼⡿⠁⠀⠛⠛⠒⠒⢀⣀⡀⠀⠀⠀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⣰⣾⠟⠋⠙⢻⣿⠀⠀⠛⠛⢛⣿⣿⠏⠀⣠⣿⣯⣤⣤⠄⠀⠀⠀⠀⠈⢿⣷⡀⠀⣰⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⣿⣯⠀⠀⠀⢸⣿⠀⠀⠀⣠⣿⡟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢿⣧⣰⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠙⠿⣷⣦⣴⢿⣿⠄⢀⣾⣿⣿⣶⣶⣶⠆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣿⡿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀by: CaptMeelo⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠁⠀⠀⠀

usage: builder.py [-h] -s  -p  -m  [-tp] [-sp] [-pp] [-b] [-d]

options:
  -h, --help  show this help message and exit
  -s          path to raw shellcode
  -p          password
  -m          shellcode execution method (e.g. 1)
  -tp         process to inject (e.g. svchost.exe)
  -sp         process to spawn (e.g. C:\\Windows\\System32\\RuntimeBroker.exe)
  -pp         parent process to spoof (e.g. explorer.exe)
  -b          binary to spoof metadata (e.g. C:\\Windows\\System32\\RuntimeBroker.exe)
  -d          domain to spoof (e.g. www.microsoft.com)

shellcode execution method:
   1          Early-bird APC Queue (requires sacrificial proces)
   2          Thread Hijacking (requires sacrificial proces)
   3          KernelCallbackTable (requires sacrificial process that has GUI)
   4          Section View Mapping
   5          Thread Suspension
   6          LineDDA Callback
   7          EnumSystemGeoID Callback
   8          FLS Callback
   9          SetTimer
   10         Clipboard

Example

Execute builder.py and supply the necessary data.

(venv) PS C:\MalDev\laZzzy> python3 .\builder.py -s .\calc.bin -p CaptMeelo -m 1 -pp explorer.exe -sp C:\\Windows\\System32\\notepad.exe -d www.microsoft.com -b C:\\Windows\\System32\\mmc.exe

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣤⣤⣤⣤⠀⢀⣼⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠀⠀⢀⣀⣀⡀⠀⠀⠀⢀⣀⣀⣀⣀⣀⡀⠀⢀⣼⡿⠁⠀⠛⠛⠒⠒⢀⣀⡀⠀⠀⠀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⣰⣾⠟⠋⠙⢻⣿⠀⠀⠛⠛⢛⣿⣿⠏⠀⣠⣿⣯⣤⣤⠄⠀⠀⠀⠀⠈⢿⣷⡀⠀⣰⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⣿⣯⠀⠀⠀⢸⣿⠀⠀⠀⣠⣿⡟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⢿⣧⣰⣿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣿⣿⠀⠀⠙⠿⣷⣦⣴⢿⣿⠄⢀⣾⣿⣿⣶⣶⣶⠆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣿⡿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀by: CaptMeelo⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠁⠀⠀⠀

[+] XOR-encrypting payload with
        [*] Key:                        d3b666606468293dfa21ce2ff25e86f6

[+] AES-encrypting payload with
        [*] IV:                         f96312f17a1a9919c74b633c5f861fe5
        [*] Key:                        6c9656ed1bc50e1d5d4033479e742b4b8b2a9b2fc81fc081fc649e3fb4424fec

[+] Modifying template using
        [*] Technique:                  Early-bird APC Queue
        [*] Process to inject:          None
        [*] Process to spawn:           C:\\Windows\\System32\\RuntimeBroker.exe
        [*] Parent process to spoof:    svchost.exe

[+] Spoofing metadata
        [*] Binary:                     C:\\Windows\\System32\\RuntimeBroker.exe
        [*] CompanyName:                Microsoft Corporation
        [*] FileDescription:            Runtime Broker
        [*] FileVersion:                10.0.22621.608 (WinBuild.160101.0800)
        [*] InternalName:               RuntimeBroker.exe
        [*] LegalCopyright:             © Microsoft Corporation. All rights reserved.
        [*] OriginalFilename:           RuntimeBroker.exe
        [*] ProductName:                Microsoft® Windows® Operating System
        [*] ProductVersion:             10.0.22621.608

[+] Compiling project
        [*] Compiled executable:        C:\MalDev\laZzzy\loader\x64\Release\laZzzy.exe

[+] Signing binary with spoofed cert
        [*] Domain:                     www.microsoft.com
        [*] Version:                    2
        [*] Serial:                     33:00:59:f8:b6:da:86:89:70:6f:fa:1b:d9:00:00:00:59:f8:b6
        [*] Subject:                    /C=US/ST=WA/L=Redmond/O=Microsoft Corporation/CN=www.microsoft.com
        [*] Issuer:                     /C=US/O=Microsoft Corporation/CN=Microsoft Azure TLS Issuing CA 06
        [*] Not Before:                 October 04 2022
        [*] Not After:                  September 29 2023
        [*] PFX file:                   C:\MalDev\laZzzy\output\www.microsoft.com.pfx

[+] All done!
        [*] Output file:                C:\MalDev\laZzzy\output\RuntimeBroker.exe

Shellcode Execution Techniques

  1. Early-bird APC Queue (requires sacrificial process)
  2. Thread Hijacking (requires sacrificial process)
  3. KernelCallbackTable (requires sacrificial process that has a GUI)
  4. Section View Mapping
  5. Thread Suspension
  6. LineDDA Callback
  7. EnumSystemGeoID Callback
  8. Fiber Local Storage (FLS) Callback
  9. SetTimer
  10. Clipboard

Notes

  • Only works on Windows x64
  • Debugging only works on Release mode
  • Sometimes, KernelCallbackTable doesn’t work on the first run but will eventually work afterward
R K

Recent Posts

Understanding the Model Context Protocol (MCP) and How It Works

Introduction to the Model Context Protocol (MCP) The Model Context Protocol (MCP) is an open…

3 days ago

The file Command – Quickly Identify File Contents in Linux

While file extensions in Linux are optional and often misleading, the file command helps decode what a…

4 days ago

How to Use the touch Command in Linux

The touch command is one of the quickest ways to create new empty files or update timestamps…

4 days ago

How to Search Files and Folders in Linux Using the find Command

Handling large numbers of files is routine for Linux users, and that’s where the find command shines.…

4 days ago

How to Move and Rename Files in Linux with the mv Command

Managing files and directories is foundational for Linux workflows, and the mv (“move”) command makes it easy…

4 days ago

How to Create Directories in Linux with the mkdir Command

Creating directories is one of the earliest skills you'll use on a Linux system. The mkdir (make…

4 days ago