Analysis of nsiproxy.sys: clean verdict, risk score 26/100. 0 YARA matches. SHA256 b9cb0f2e0f272f0a. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver nsiproxy.sys and assigned a verdict of Clean with a composite risk score of 26/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (26/100) |
| YARA matches | 0 |
| File size | 48640 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | b9cb0f2e0f272f0ab6b14f009f74206dadb79fc5b6dd10eb4e9801640f957f42 |
| SHA1 | b271b9cc5285ca7b6329ecbf1028b0758bdbba09 |
| MD5 | cb536cf8a78ea11ba462e529111dc9ca |
Version resource data embedded in the nsiproxy.sys PE header, as extracted by the analysis engine.
| File description | NSI Proxy |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | nsiproxy.sys |
| Internal name | nsiproxy.sys |
| File version | 10.0.19041.3636 (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 | 42 / 100 |
| Known-vulnerable corpus | 0 / 100 |
| Code-signing state | 50 / 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 nsiproxy.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| ObOpenObjectByPointer | medium | Moderate risk - system modification capability |
| ZwCreateKey | medium | Moderate risk - system modification capability |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| PsGetCurrentProcess | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| ProbeForWrite | low | Standard kernel API - generally benign |
| IoCreateDeviceSecure | low | Standard kernel API - generally benign |
| SeAccessCheck | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| ZwOpenKey | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| IofCompleteRequest | 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 |
|---|---|---|---|
| 0x00340037 | high | METHOD_NEITHER | FILE_DEVICE_DISK Function #13 |
| 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 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x0080007E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #31 |
| 0x00340030 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #12 |
| 0x00340120 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #72 |
| 0x00347420 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3336 |
| 0x0034741C | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3335 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x0034FB81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3808 |
| 0x00343D2E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #3915 |
| 0x00340384 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #225 |
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 | 0x5838 | 0x5A00 | 5.92 | CODE, EXEC, READ |
| .rdata | 0x17A8 | 0x1800 | 4.74 | IDATA, READ |
| .data | 0x0304 | 0x0400 | 1.26 | IDATA, READ, WRITE |
| .pdata | 0x06D8 | 0x0800 | 3.97 | IDATA, READ |
| .idata | 0x0D40 | 0x0E00 | 4.55 | IDATA, READ |
| PAGE | 0x1C52 | 0x1E00 | 5.98 | CODE, EXEC, READ |
| INIT | 0x00D4 | 0x0200 | 2.86 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0024 | 0x0200 | 0.35 | IDATA, READ, DISCARD |
| .rsrc | 0x05B8 | 0x0600 | 3.17 | IDATA, READ, DISCARD |
| .reloc | 0x04A4 | 0x0600 | 4.55 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 80 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| 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 |
| T1553.006 | Code Signing Policy Modification | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
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, nsiproxy.sys is assessed as clean, with no notable risk signals. Its composite risk score is 26/100 (verdict: clean). Always validate findings independently before acting.
nsiproxy.sys has a DriverShield composite risk score of 26/100, placing it in the clean verdict band. SHA256: b9cb0f2e0f272f0ab6b14f009f74206dadb79fc5b6dd10eb4e9801640f957f42.
nsiproxy.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.
Related: What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas