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+# DefenderKiller
+
+![DefenderKiller Banner](banner.png)
+
+**Kernel process termination using Microsoft's own signed driver.**
+
+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.
+
+## ⚠️ Disclaimer
+
+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.
+
+## 📝 Blog Post
+
+Full reverse engineering writeup and technical breakdown:
+
+**[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)**
+
+## Why This Is Different
+
+Every BYOVD tool out there relies on third-party drivers. DefenderKiller uses **Microsoft's own signed Defender driver** against itself.
+
+- **0/70 detection** on VirusTotal
+- **Microsoft Code Signing PCA** signed — trusted at the highest level
+- **Not on the Vulnerable Driver Blocklist** — Microsoft excludes their own drivers by design
+- **Bypasses PPL** — `ZwTerminateProcess` from kernel mode ignores Protected Process Light
+- **Bypasses ObRegisterCallbacks** — `ZwOpenProcess` from ring 0 skips EDR handle protection
+- **Survives April 2026 driver trust policy** — WHCP attestation-signed drivers are still trusted
+
+## How It Works
+
+1. Load the Microsoft-signed KSLDriver.sys with a custom service
+2. Bypass the `AllowedProcessName` check by writing our own path to the registry
+3. Send IOCTL `0x222044` sub-command 8 with the target PID
+4. Close the handle — `IRP_MJ_CLEANUP` fires `ZwTerminateProcess` from kernel mode
+5. Target process terminated. No callback intercepts it. No protection blocks it.
+
+## Usage
+
+```
+DefenderKiller.exe load C:\path\to\KSLDriver_2011.sys
+DefenderKiller.exe kill <PID or process name>
+DefenderKiller.exe unload
+```
+
+### Example
+
+```
+C:\> DefenderKiller.exe load C:\KSLDriver_2011.sys
+[+] Loaded
+
+C:\> DefenderKiller.exe kill CSFalconService.exe
+[+] Killed 4628
+
+C:\> DefenderKiller.exe unload
+[+] Unloaded
+```
+
+## Driver Details
+
+| Property | Value |
+|----------|-------|
+| **File** | KSLDriver.sys |
+| **Description** | Microsoft Malware Protection - KSLDriver |
+| **Product** | Microsoft Malware Protection |
+| **Version** | 1.1.0013.0 |
+| **Size** | 34.83 KB (35,664 bytes) |
+| **Architecture** | x64 (64-bit native) |
+| **Date Signed** | September 16, 2011 |
+| **Signer** | Microsoft Corporation |
+| **Certificate** | Microsoft Code Signing PCA → Microsoft Root Authority |
+| **Detection** | **0/70** on VirusTotal |
+| **SHA-256** | `d5764d24e78914ab2a9db6b24e323342d0b37998f43add1a9e49b00992b0d645` |
+| **MD5** | `0ebb390b7aeec45ec061d9870a34fd42` |
+| **SHA-1** | `7772c1215e31836cc8d830cb65f224ec929cfb69` |
+| **Imphash** | `8bf2a95defbf5214f859fd3f24f64e5f` |
+| **Authentihash** | `0a19385f73a265d8086a8b1304873110ce33a37ce08d442b9fb9390c82fa50e7` |
+| **VirusTotal** | [Full Analysis](https://www.virustotal.com/gui/file/d5764d24e78914ab2a9db6b24e323342d0b37998f43add1a9e49b00992b0d645) |
+
+
+## Note
+
+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.
+
+## Author
+
+**Jehad Abudagga**
+
+[![X](https://img.shields.io/badge/X-@j3h4ck-000000?style=flat&logo=x)](https://x.com/j3h4ck)
+[![LinkedIn](https://img.shields.io/badge/LinkedIn-Jehad%20Abudagga-0A66C2?style=flat&logo=linkedin)](https://www.linkedin.com/in/jehad-abudagga)
+[![Medium](https://img.shields.io/badge/Medium-@jehadbudagga-12100E?style=flat&logo=medium)](https://medium.com/@jehadbudagga)
+[![GitHub](https://img.shields.io/badge/GitHub-redteamfortress-181717?style=flat&logo=github)](https://github.com/redteamfortress)