Analysis of storufs.sys: clean verdict, risk score 9/100. 0 YARA matches. SHA256 e1caaf59ba4cf4bd. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver storufs.sys and assigned a verdict of Clean with a composite risk score of 9/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (9/100) |
| YARA matches | 0 |
| File size | 66528 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-03-22 |
| SHA256 | e1caaf59ba4cf4bd80a4f472e9944fc3254bae90d893e1cf9e3fb659e71f8d10 |
| SHA1 | e125c1b30102886cc0475a539974f47eb25f2b04 |
| MD5 | a245762cf5d2d3ce0cd69470ca769963 |
Version resource data embedded in the storufs.sys PE header, as extracted by the analysis engine.
| File description | MS UFS Storport Miniport Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | storufs.sys |
| Internal name | storufs.sys |
| File version | 10.0.19041.4474 (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 | 0 / 100 |
| IOCTL dispatch surface | 39 / 100 |
| Known-vulnerable corpus | 0 / 100 |
| Code-signing state | 80 / 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 storufs.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| IoGetDeviceObjectPointer | medium | Moderate risk - system modification capability |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | 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 |
|---|---|---|---|
| 0x008086C7 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #433 |
| 0x00223417 | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3333 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00809189 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #1122 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x0080C481 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #288 |
| 0x0080FF81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #4064 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x0022E8CA | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #2610 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x0080E281 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2208 |
| 0x003403A8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #234 |
| 0x0034002E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #11 |
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 | 0x9F29 | 0xA000 | 6.33 | CODE, EXEC, READ |
| .rdata | 0x10E8 | 0x1200 | 5.19 | IDATA, READ |
| .data | 0x00A8 | 0x0200 | 0.28 | IDATA, READ, WRITE |
| .pdata | 0x05E8 | 0x0600 | 4.49 | IDATA, READ |
| .idata | 0x07B6 | 0x0800 | 4.44 | IDATA, READ |
| PAGE | 0x02F5 | 0x0400 | 5.06 | CODE, EXEC, READ |
| .edata | 0x006B | 0x0200 | 1.29 | IDATA, READ |
| INIT | 0x0292 | 0x0400 | 4.54 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0078 | 0x0200 | 0.88 | IDATA, READ, DISCARD |
| .rsrc | 0x0410 | 0x0600 | 2.49 | IDATA, READ, DISCARD |
| .reloc | 0x0410 | 0x0600 | 3.86 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 85 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1071 | Application Layer Protocol | Command and Control |
| T1543.003 | Windows Service | Persistence |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Production PCA 2011 |
| Serial | 3300000460CF42A912315F6FB3000000000460 |
| Valid from | 2023-11-16 19:20 UTC |
| Valid until | 2024-11-14 19:20 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status no_findings, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, storufs.sys is assessed as clean, with no notable risk signals. Its composite risk score is 9/100 (verdict: clean). Always validate findings independently before acting.
storufs.sys has a DriverShield composite risk score of 9/100, placing it in the clean verdict band. SHA256: e1caaf59ba4cf4bd80a4f472e9944fc3254bae90d893e1cf9e3fb659e71f8d10.
storufs.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