2025-02-13
Several years ago, I used a method to bypass most EDR (Endpoint Detection and Response) systems with ease. In 2025, a simplistic approach like DInvoke’s NtCreateThreadEx is unlikely to bypass modern defense mechanisms. However, it might still work against legacy EDR systems that rely on user-land hooks and monitoring of libraries like kernel32.dll, advapi32.dll, and user32.dll. This is because NtCreateThreadEx resides in ntdll.dll, which makes direct syscalls to the kernel.
Modern EDR systems, however, are far more sophisticated. Without using different DInvoke functions, you have virtually no chance of bypassing them. Even then, you are at the mercy of kernel-land monitoring and hooks. While there are ways to circumvent these defenses, they require rewriting the core principles of the malware.
GitHub Repository:
Practice Verified Codes and Commands:
using System;
using System.Runtime.InteropServices;
public class Program
{
[DllImport("ntdll.dll", SetLastError = true)]
private static extern IntPtr NtCreateThreadEx(
out IntPtr hThread,
uint desiredAccess,
IntPtr objectAttributes,
IntPtr processHandle,
IntPtr startAddress,
IntPtr parameter,
bool createSuspended,
uint stackZeroBits,
uint sizeOfStackCommit,
uint sizeOfStackReserve,
IntPtr bytesBuffer);
public static void Main()
{
IntPtr hThread;
IntPtr processHandle = IntPtr.Zero; // Replace with actual process handle
IntPtr startAddress = IntPtr.Zero; // Replace with actual start address
IntPtr parameter = IntPtr.Zero; // Replace with actual parameter
NtCreateThreadEx(out hThread, 0x1FFFFF, IntPtr.Zero, processHandle, startAddress, parameter, false, 0, 0, 0, IntPtr.Zero);
if (hThread != IntPtr.Zero)
{
Console.WriteLine("Thread created successfully!");
}
else
{
Console.WriteLine("Failed to create thread.");
}
}
}
What Undercode Say:
In the ever-evolving landscape of cybersecurity, the methods to bypass EDR systems have become increasingly complex. The use of DInvoke’s NtCreateThreadEx, while effective against legacy systems, is no longer sufficient against modern defenses. The shift from user-land to kernel-land monitoring has necessitated a more sophisticated approach to malware development.
To stay ahead, cybersecurity professionals must continuously update their knowledge and tools. Here are some Linux and Windows commands that can aid in understanding and developing more advanced techniques:
Linux Commands:
strace -f -e trace=network,process -p <PID>: Trace system calls and signals of a running process.gdb -p <PID>: Attach GDB to a running process for debugging.netstat -tuln: Display listening ports and associated services.
Windows Commands:
tasklist /svc: List all running processes and their associated services.netsh advfirewall show allprofiles: Display the current firewall configuration.wmic process get name,processid,parentprocessid,commandline: Retrieve detailed information about running processes.
For further reading and resources, consider the following URLs:
– Advanced Windows Debugging
– Linux System Programming
In conclusion, while legacy methods like DInvoke’s NtCreateThreadEx provide a foundational understanding, modern cybersecurity demands more advanced techniques. Continuous learning and adaptation are key to staying ahead in this dynamic field.
References:
Hackers Feeds, Undercode AI
