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Shhhloader – SysWhispers Shellcode Loader

Çağlar Arlı      -    53 Views

Shhhloader – SysWhispers Shellcode Loader


Shhhloader is a SysWhispers Shellcode Loader that is currently a Work in Progress. It takes raw shellcode as input and compiles a C++ stub that has been integrated with SysWhispers in order to bypass AV/EDR. The included python builder will work on any Linux system that has Mingw-w64 installed.

The tool has been confirmed to successfully load Meterpreter and a Cobalt Strike beacon on fully updated systems with Windows Defender enabled. The project itself is still in a PoC/WIP state, as it currently doesn't work with all payloads.


2/9/22 EDIT: Shhhloader now includes 5 different ways to execute your shellcode! See below for updated usage. Big thanks to @Snovvcrash and their DInjector project for inspiration! I highly recommend taking a look at it for more information regarding the shellcode injection techniques and code that this tool is now based on.

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usage: Shhhloader.py [-h] [-p explorer.exe] [-m QueueUserAPC] [-nr] [-v] [-d] [-o a.exe] file

ICYGUIDER'S CUSTOM SYSWHISPERS SHELLCODE LOADER

positional arguments:
file File containing raw shellcode

optional arguments:
-h, --help show this help message and exit
-p explorer.exe, --process explorer.exe
Process to inject into (Default: explorer.exe)
-m QueueUserAPC, --method QueueUserAPC
Method for shellcode execution (Options: ProcessHollow, QueueUserAPC,
RemoteThreadContext, RemoteThreadSuspended, CurrentThread) (Default: QueueUserAPC)
-nr , --no-randomize Disable syscall name randomization
-v, --verbose Enable debugging messages upon execution
-d, --dll-sandbox Use DLL based sandbox checks instead of the standard ones
-o a.exe, --outfile a.exe
Name of compiled file

Video Demo: https://www.youtube.com/watch?v=-KLGV_aGYbw

Features:

  • 5 Different Shellcode Execution Methods (ProcessHollow, QueueUserAPC, RemoteThreadContext, RemoteThreadSuspended, CurrentThread)
  • PPID Spoofing
  • Block 3rd Party DLLs
  • Syscall Name Randomization
  • XOR Encryption with Dynamic Key Generation
  • Sandbox Evasion via Loaded DLL Enumeration
  • Sandbox Evasion via Checking Processors, Memory, and Time

Tested and Confirmed Working on:

  • Windows 10 21H1 (10.0.19043)
  • Windows 10 20H2 (10.0.19042)
  • Windows Server 2019 (10.0.17763)

Scan Results as of 2/9/22 (x64 Meterpreter QueueUserAPC): https://antiscan.me/scan/new/result?id=tntuLnCkTCwz

Greetz & Credit: