5 Ways to Backdoor a Windows System

Introduction:

As a red team operator, it is crucial to continually explore advanced techniques to effectively simulate real-world threats during authorized penetration tests. Backdooring Windows systems provides a powerful avenue for unauthorized access and control. In this reference manual, we will explore five advanced ways to backdoor a Windows system, equipping red team operators with the knowledge and techniques necessary to conduct sophisticated and stealthy operations. Each technique will be accompanied by detailed command descriptions or code snippets, enabling red team operators to execute these methods effectively.

Technique: DLL Hijacking

DLL hijacking involves replacing a legitimate Dynamic Link Library (DLL) with a malicious one to execute unauthorized code when a vulnerable application loads the hijacked DLL. Here’s an example of how to exploit DLL hijacking:

# Identify vulnerable applications and their associated DLLs
dir /s /b C:\Path\To\Target\Application.exe
# Replace the legitimate DLL with the malicious one
copy C:\Path\To\Malicious.dll C:\Path\To\Target\Application.dll

By replacing the legitimate DLL (e.g., Application.dll) with the malicious DLL (e.g., Malicious.dll), the backdoor is injected when the vulnerable application is executed.