Shhhloader

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:

• Jthuraisamy for his amazing project SysWhispers: https://github.com/jthuraisamy/SysWhispers
• OutFlank for creating InlineWhispers (Mingw-w64 Compatible SysWhispers): https://github.com/outflanknl/InlineWhispers
• FalconForceTeam for their syscall generation tool that supports SysWhispers2: https://github.com/FalconForceTeam/SysWhispers2BOF
• Snovvcrash for their NimHollow project, which I used as a template for process hollowing: https://github.com/snovvcrash/NimHollow
• Snovvcrash again for their DInjector project, which I used as a template for many of the included injection techniques: https://github.com/snovvcrash/DInjector
• Cerbersec for their Ares project, whose code I used for PPID Spoofing, Blocking 3rd Party DLLs and Sandbox Evasion: https://github.com/Cerbersec/Ares