Analysis of win32k.sys: clean verdict, risk score 20/100. 0 YARA matches, 0/75 multi-engine detections. SHA256 ef965f62f54f0113. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver win32k.sys and assigned a verdict of Clean with a composite risk score of 20/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (20/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 75 |
| File size | 812504 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-08-22 |
| SHA256 | ef965f62f54f0113921844cf43b3ea5ff236beb3bebec4dd8184337abe2dc209 |
| SHA1 | bd7c4f35f6d50cd4c65ef3672546dc9b5257e786 |
| MD5 | 104881f8d11143048afe6d2527257799 |
Version resource data embedded in the win32k.sys PE header, as extracted by the analysis engine.
| File description | Multi-User Win32 Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | win32k.sys |
| Internal name | win32k.sys |
| File version | 10.0.26100.9168 (WinBuild.160101.0800) |
| Copyright | © Microsoft Corporation. All rights reserved. |
Each component is scored 0-100 and then weighted into the composite. See the analysis methodology for the exact formula.
| Component | Sub-score |
|---|---|
| Multi-engine consensus | 0 / 100 |
| YARA signature matches | 0 / 100 |
| Dangerous kernel imports | 57 / 100 |
| IOCTL dispatch surface | 75 / 100 |
| Known-vulnerable corpus | 0 / 100 |
| Code-signing state | 0 / 100 |
| Packing and entropy | 0 / 100 |
| Dynamic behaviour | 0 / 100 |
| CVE cross-reference | 0 / 100 |
Kernel-mode APIs resolved from the Import Address Table of win32k.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ObOpenObjectByPointer | medium | Moderate risk - system modification capability |
| ZwQuerySystemInformation | medium | Moderate risk - system modification capability |
| IoGetDeviceObjectPointer | medium | Moderate risk - system modification capability |
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| PsGetCurrentProcess | low | Standard kernel API - generally benign |
| KeDelayExecutionThread | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| ExAllocatePool2 | low | Standard kernel API - generally benign |
| RtlZeroMemory | low | Standard kernel API - generally benign |
| RtlCopyMemory | low | Standard kernel API - generally benign |
| RtlMoveMemory | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
Control codes reachable through the driver dispatch routine. Codes tied to published exploit code are flagged, since they are the primary Bring Your Own Vulnerable Driver (BYOVD) entry points.
| Code | Severity | Transfer | Description |
|---|---|---|---|
| 0x0080808B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #34 |
| 0x0022341F | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3335 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
| 0x008024B4 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2349 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x00808B48 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #722 |
| 0x00343DBC | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3951 |
| 0x003487E8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #506 |
| 0x0022B3E8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3322 |
| 0x008024AC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2347 |
| 0x00802494 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2341 |
| 0x00340074 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #29 |
| 0x0022F981 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3680 |
| 0x00802500 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2368 |
| 0x00223D00 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3904 |
| 0x9C400200 | medium | METHOD_BUFFERED | CUSTOM_LENOVO Function #128 |
| 0x00340398 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #230 |
| 0x0022F146 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #3153 |
| 0x002226FC | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2495 |
| 0x00220738 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #462 |
| 0x0022A74C | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2515 |
| 0x00224760 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #472 |
| 0x00226774 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2525 |
Showing 24 of 25 extracted control codes.
Section layout and Shannon entropy. High entropy in a code section is a packing or encryption indicator.
| Section | Virtual size | Raw size | Entropy | Flags |
|---|---|---|---|---|
| .text | 0x6D877 | 0x6E000 | 5.62 | CODE, EXEC, READ |
| fothk | 0x1000 | 0x1000 | 0.03 | CODE, EXEC, READ |
| .rdata | 0xC610 | 0xD000 | 3.79 | IDATA, READ |
| .data | 0xDC20 | 0xB000 | 4.88 | IDATA, READ, WRITE |
| .pdata | 0xE424 | 0xF000 | 5.5 | IDATA, READ |
| .idata | 0x4596 | 0x5000 | 4.63 | IDATA, READ |
| TABLERO | 0x4674 | 0x5000 | 4.05 | IDATA, READ |
| PAGE | 0x04DB | 0x1000 | 2.67 | CODE, EXEC, READ |
| .edata | 0x14B8B | 0x15000 | 5.77 | IDATA, READ |
| INIT | 0x0544 | 0x1000 | 2.77 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x22B8 | 0x3000 | 3.39 | IDATA, READ, DISCARD |
| .rsrc | 0x0400 | 0x1000 | 1.1 | IDATA, READ, DISCARD |
| .reloc | 0x7BA4 | 0x8000 | 6.08 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 100 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1055.001 | Process Injection: DLL Injection | Defense Evasion |
| T1071 | Application Layer Protocol | Command and Control |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1489 | Service Stop | Impact |
| T1543.003 | Windows Service | Persistence |
| T1547.001 | Registry Run Keys | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | Defense Evasion |
| T1562.001 | Impair Defenses: Disable/Modify Tools | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Production PCA 2011 |
| Serial | 330000059B7ABC51A19E71241800000000059B |
| Valid from | 2026-04-16 19:09 UTC |
| Valid until | 2026-10-17 19:09 UTC |
| Signature validity | Verified |
Engine angr, status static_approximation, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, win32k.sys is assessed as clean, with no notable risk signals. Its composite risk score is 20/100 (verdict: clean). Always validate findings independently before acting.
win32k.sys has a DriverShield composite risk score of 20/100, placing it in the clean verdict band. SHA256: ef965f62f54f0113921844cf43b3ea5ff236beb3bebec4dd8184337abe2dc209.
win32k.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Microsoft Windows.
Related: Other drivers signed by Microsoft Windows · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas