Fix Demon DLL

[voidvxvt]

Overview
This PR fixes the Demon DLL crash caused by a null pointer dereference.
TLDR: rundll32 demon.x64.dll,Start will work again.

Details
LdrModulePeb is called in DllMain before Instance has been initialized.

Havoc/payloads/Demon/src/main/MainDll.c

Line 47 in 69ce17c

Kernel32 = LdrModulePeb( H_MODULE_KERNEL32 );

LdrModulePeb accesses the uninitialized Instance, which is a null pointer derefernce at this point of execution, causing the process to crash.

Havoc/payloads/Demon/src/core/Win32.c

Line 74 in 69ce17c

if ( ! Instance->Teb ) {

I’ve tested the x64 EXE, DLL, and SHC on Windows 11, with WaitForSingleObjectEx, Foliage, Ekko and Zilean sleep obfuscation enabled and all binaries are operating well with this update.

[M4rdc0re]

I tested it and the shellcode option with sleep jmp gadget "jmp rbx" is not working with your solution don't delete the information of "payloads/Demon/src/Demon.c" and it will work correctly. Actually, you only need to modify the file "payloads/Demon/src/main/MainDll.c"