Analysis of MsIo64.sys: vulnerable verdict, risk score 72/100. 1 YARA match, 1/76 multi-engine detections. SHA256 d636c011b8b28965. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver MsIo64.sys and assigned a verdict of Vulnerable with a composite risk score of 72/100, indicating a known or likely vulnerability surface (60-79 band).
| Verdict | Vulnerable (72/100) |
| YARA matches | 1 |
| Multi-engine detections | 1 / 76 |
| File size | 19000 bytes |
| Code-signing signer | Microsoft Windows Hardware Compatibility Publisher |
| Analyzed | 2026-04-14 |
| SHA256 | d636c011b8b2896572f5de260eb997182cc6955449b044a739bd19cbe6fdabd2 |
| SHA1 | 1de9f25d189faa294468517b15947a523538ce9d |
| MD5 | 61b068b10abfa0776f3b96a208d75bf9 |
Version resource data embedded in the MsIo64.sys PE header, as extracted by the analysis engine.
| File description | MICSYS IO driver |
|---|---|
| Product | MsIo64 Driver Version 1.3 |
| Company | MICSYS Technology Co., LTd |
| Original filename | MsIo64.sys |
| Internal name | MsIo64.sys |
| File version | 1.3 x64 built by: WinDDK |
| Copyright | Copyright (c) 2021 MICSYS |
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 | 5 / 100 |
| Dangerous kernel imports | 78 / 100 |
| IOCTL dispatch surface | 15 / 100 |
| Known-vulnerable corpus | 100 / 100 |
| Code-signing state | 80 / 100 |
| Packing and entropy | 0 / 100 |
| Dynamic behaviour | 0 / 100 |
| CVE cross-reference | 40 / 100 |
Kernel-mode APIs resolved from the Import Address Table of MsIo64.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ZwMapViewOfSection | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| ProbeForWrite | low | Standard kernel API - generally benign |
| DbgPrint | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| ProbeForRead | low | Standard kernel API - generally benign |
| ZwClose | 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 |
|---|---|---|---|
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x008024AC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2347 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x0034032C | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #203 |
| 0x00340036 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #13 |
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 | 0x0E1F | 0x1000 | 5.71 | CODE, EXEC, READ |
| .rdata | 0x01E8 | 0x0200 | 4.16 | IDATA, READ |
| .data | 0x015C | 0x0200 | 0.62 | IDATA, READ, WRITE |
| .pdata | 0x0060 | 0x0200 | 0.82 | IDATA, READ |
| INIT | 0x02B2 | 0x0400 | 3.64 | CODE, EXEC, READ, WRITE, DISCARD |
| .rsrc | 0x0390 | 0x0400 | 3.1 | IDATA, READ, DISCARD |
| Control Flow Guard | Not enabled |
|---|---|
| ASLR | Not enabled |
| DEP | Not enabled |
| Integrity check | Not enforced |
| Mitigation score | 5 / 100 |
| Rule | Severity | Detects |
|---|---|---|
| PUA_VULN_Driver_Micsystechnologycoltd_Msiosys_Msiodriverversion_X_AE42 | medium | Detects vulnerable driver mentioned in known-vulnerable driver corpus project using VersionInfo values from the PE header - MsIo64.sys |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1543.003 | Windows Service | Persistence |
| T1562.001 | Impair Defenses | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows Hardware Compatibility Publisher |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Third Party Component CA 2014 |
| Serial | 330000005635887EDE1882EF76000000000056 |
| Valid from | 2022-06-07 18:08 UTC |
| Valid until | 2023-06-01 18:08 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status completed, 39 paths explored at a maximum depth of 39. Vulnerability classes reached: 1. Exploitable paths: 0.
Corpus match: this hash is present in the known-vulnerable driver corpus DriverShield cross-references during analysis, which is why the score carries a full weighting on that component.
Based on DriverShield static and dynamic analysis, MsIo64.sys is flagged as vulnerable and is a potential Bring Your Own Vulnerable Driver (BYOVD) risk. Its composite risk score is 72/100 (verdict: vulnerable). Always validate findings independently before acting.
MsIo64.sys has a DriverShield composite risk score of 72/100, placing it in the vulnerable verdict band. SHA256: d636c011b8b2896572f5de260eb997182cc6955449b044a739bd19cbe6fdabd2.
MsIo64.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 Hardware Compatibility Publisher.
Related: Other drivers signed by Microsoft Windows Hardware Compatibility Publisher · CVE-2020-17382 · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas