Analysis of winverbs.sys: clean verdict, risk score 16/100. 0 YARA matches. SHA256 d2a5ed039ed83010. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver winverbs.sys and assigned a verdict of Clean with a composite risk score of 16/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (16/100) |
| YARA matches | 0 |
| File size | 73016 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-03-22 |
| SHA256 | d2a5ed039ed83010e0bb4bb1a69f9d142d42be2c75e56cfcf3f157a735cb688e |
| SHA1 | 4a764ebd55ec250b2bfe0733c010211229a7e28b |
| MD5 | f4c4fd42f8dd657157823db617cc3a3d |
Version resource data embedded in the winverbs.sys PE header, as extracted by the analysis engine.
| File description | Kernel WinVerbs |
|---|---|
| Product | OpenFabrics Windows |
| Company | Mellanox |
| Original filename | winverbs.sys |
| Internal name | winverbs.sys |
| File version | 5.50.14695 |
| Copyright | Copyright© 2009 Mellanox Technologies Ltd |
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 | 30 / 100 |
| IOCTL dispatch surface | 48 / 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 winverbs.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| KeSetEvent | 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 |
|---|---|---|---|
| 0x008083FF | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #255 |
| 0x0080BF83 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #4064 |
| 0x0022BB07 | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3777 |
| 0x008000BB | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #46 |
| 0x0022341B | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3334 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x0080B315 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3269 |
| 0x0080AB15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2757 |
| 0x0080C481 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #288 |
| 0x002263E8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2298 |
| 0x0080B841 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3600 |
| 0x0034EF15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3013 |
| 0x00340078 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #30 |
| 0x00340318 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #198 |
| 0x00340038 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #14 |
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 | 0xC55B | 0xC600 | 6.13 | CODE, EXEC, READ |
| .rdata | 0x12FC | 0x1400 | 4.94 | IDATA, READ |
| .data | 0x0D98 | 0x0200 | 1.82 | IDATA, READ, WRITE |
| .pdata | 0x0834 | 0x0A00 | 3.89 | IDATA, READ |
| PAGE | 0x052C | 0x0600 | 5.49 | CODE, EXEC, READ |
| INIT | 0x0458 | 0x0600 | 4.1 | CODE, EXEC, READ, DISCARD |
| .rsrc | 0x0378 | 0x0400 | 3.01 | IDATA, READ, DISCARD |
| .reloc | 0x0050 | 0x0200 | 1.01 | 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 |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1543.003 | Windows Service | Persistence |
| T1547.001 | Registry Run Keys | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | 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 | 330000023241FB59996DCC4DFF000000000232 |
| Valid from | 2019-05-02 21:24 UTC |
| Valid until | 2020-05-02 21:24 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, winverbs.sys is assessed as clean, with no notable risk signals. Its composite risk score is 16/100 (verdict: clean). Always validate findings independently before acting.
winverbs.sys has a DriverShield composite risk score of 16/100, placing it in the clean verdict band. SHA256: d2a5ed039ed83010e0bb4bb1a69f9d142d42be2c75e56cfcf3f157a735cb688e.
winverbs.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