Analysis of VmsProxy.sys: clean verdict, risk score 22/100. 0 YARA matches, 0/76 multi-engine detections. SHA256 47b9d585cf7c8a9a. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver VmsProxy.sys and assigned a verdict of Clean with a composite risk score of 22/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (22/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 76 |
| File size | 71072 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-05-25 |
| SHA256 | 47b9d585cf7c8a9a300614c8aa3ff49b450cca3ba249f97c04e7907ad9532740 |
| SHA1 | 1c8232291ffe3c2e09d93304de9467596dff1dea |
| MD5 | 72922b3e866f9d77700bb568212dd143 |
Version resource data embedded in the VmsProxy.sys PE header, as extracted by the analysis engine.
| File description | VMSWITCH Proxy Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | vmsproxy.sys |
| Internal name | vmsproxy.sys |
| File version | 10.0.26100.7623 (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 | 100 / 100 |
| IOCTL dispatch surface | 33 / 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 VmsProxy.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ObOpenObjectByPointer | medium | Moderate risk - system modification capability |
| ZwCreateKey | medium | Moderate risk - system modification capability |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| ExAllocatePool2 | low | Standard kernel API - generally benign |
| IoCreateDeviceSecure | low | Standard kernel API - generally benign |
| ZwOpenKey | 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 |
|---|---|---|---|
| 0x0080B58B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3426 |
| 0x00808D8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #866 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0034E72D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #2507 |
| 0x0034533D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #1231 |
| 0x00340030 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #12 |
| 0x00223418 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3334 |
| 0x0022B941 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3664 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
| 0x00808789 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #482 |
| 0x0034039C | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #231 |
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 | 0x2F37 | 0x3000 | 5.96 | CODE, EXEC, READ |
| fothk | 0x1000 | 0x1000 | 0.03 | CODE, EXEC, READ |
| .rdata | 0x0D2C | 0x1000 | 3.93 | IDATA, READ |
| .data | 0x0460 | 0x1000 | 0.41 | IDATA, READ, WRITE |
| .pdata | 0x03A8 | 0x1000 | 1.27 | IDATA, READ |
| .idata | 0x0BEA | 0x1000 | 3.39 | IDATA, READ |
| PAGE | 0x1F88 | 0x2000 | 6.21 | CODE, EXEC, READ |
| INIT | 0x04DA | 0x1000 | 2.52 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0060 | 0x1000 | 0.14 | IDATA, READ, DISCARD |
| .rsrc | 0x0400 | 0x1000 | 1.1 | IDATA, READ, DISCARD |
| .reloc | 0x04E0 | 0x1000 | 2 | 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 |
|---|---|---|
| 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 | 3300000519DADDAA8BDC44B292000000000519 |
| Valid from | 2025-06-19 18:11 UTC |
| Valid until | 2026-06-17 18:11 UTC |
| Signature validity | Verified |
Engine angr, status completed, 100 paths explored at a maximum depth of 100. Vulnerability classes reached: 0. Exploitable paths: 4.
Based on DriverShield static and dynamic analysis, VmsProxy.sys is assessed as clean, with no notable risk signals. Its composite risk score is 22/100 (verdict: clean). Always validate findings independently before acting.
VmsProxy.sys has a DriverShield composite risk score of 22/100, placing it in the clean verdict band. SHA256: 47b9d585cf7c8a9a300614c8aa3ff49b450cca3ba249f97c04e7907ad9532740.
VmsProxy.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