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

Libraries Used

kokke/tiny-AES-c skadro-official/skCrypter JustasMasiulis/lazy_importer JustasMasiulis/inline_syscall

Shellcode Execution Techniques

Early-bird APC Queue (requires sacrificial process) Thread Hijacking (requires sacrificial process) KernelCallbackTable (requires sacrificial process that has a GUI) Section View Mapping Thread Suspension LineDDA Callback EnumSystemGeoID Callback Fiber Local Storage (FLS) Callback SetTimer 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