Analysis of ALSysIO64Legacy.sys: suspicious verdict, risk score 58/100. 2 YARA matches, 0/75 multi-engine detections. SHA256 8b2884ff88353312. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver ALSysIO64Legacy.sys and assigned a verdict of Suspicious with a composite risk score of 58/100, indicating some risk signals warranting review (30-59 band).
| Verdict | Suspicious (58/100) |
| YARA matches | 2 |
| Multi-engine detections | 0 / 75 |
| File size | 80560 bytes |
| Code-signing signer | Microsoft Windows Hardware Compatibility Publisher |
| Analyzed | 2026-09-24 |
| SHA256 | 8b2884ff88353312811c420a79785df45b89ca44dc35180cdbf6888f324d7ebc |
| SHA1 | 8568ad871d1ca5ac565c1dce96a3ed69b6fe1faf |
| MD5 | 65e4eb0aafb61e76c8c0db2c8a51c7c4 |
Version resource data embedded in the ALSysIO64Legacy.sys PE header, as extracted by the analysis engine.
| File description | ALSysIO64Legacy |
|---|---|
| Product | ALSysIO64Legacy |
| Company | Arthur Liberman |
| Original filename | ALSysIO64Legacy.sys |
| Internal name | ALSysIO64Legacy.sys |
| File version | 2.3.2.19 |
| Copyright | Copyright (C) 2003-2025 Arthur Liberman |
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 | 80 / 100 |
| Dangerous kernel imports | 100 / 100 |
| IOCTL dispatch surface | 60 / 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 ALSysIO64Legacy.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapIoSpace | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| HalGetBusDataByOffset | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| ZwCreateKey | medium | Moderate risk - system modification capability |
| ObOpenObjectByPointer | medium | Moderate risk - system modification capability |
| IoGetDeviceObjectPointer | medium | Moderate risk - system modification capability |
| ZwQuerySystemInformation | medium | Moderate risk - system modification capability |
| MmUnmapIoSpace | medium | Moderate risk - system modification capability |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| IoCreateDeviceSecure | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| ZwOpenKey | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| KeDelayExecutionThread | low | Standard kernel API - generally benign |
| DbgPrint | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| RtlInitAnsiString | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | 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 |
|---|---|---|---|
| 0x0080850F | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #323 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x9C40B941 | medium | METHOD_IN_DIRECT | CUSTOM_LENOVO Function #3664 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
| 0x9C404008 | medium | METHOD_BUFFERED | CUSTOM_LENOVO Function #2 |
| 0x0022D3E8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #1274 |
| 0x0080ABE8 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2810 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x00802494 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2341 |
| 0x00344FE8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #1018 |
| 0x0080DF05 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #1985 |
| 0x00808339 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #206 |
| 0x0022FF81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #4064 |
| 0x008024AC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2347 |
| 0x008024B4 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2349 |
| 0x00340032 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #12 |
| 0x0080007E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #31 |
| 0x00340030 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #12 |
| 0x0034036C | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #219 |
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 | 0xB42A | 0xB600 | 6.31 | CODE, EXEC, READ |
| .rdata | 0x1CD8 | 0x1E00 | 4.48 | IDATA, READ |
| .data | 0x08A8 | 0x0400 | 1.16 | IDATA, READ, WRITE |
| .pdata | 0x09C0 | 0x0A00 | 4.63 | IDATA, READ |
| PAGE | 0x1BBF | 0x1C00 | 6.2 | CODE, EXEC, READ |
| INIT | 0x0802 | 0x0A00 | 4.6 | CODE, EXEC, READ, WRITE, DISCARD |
| .rsrc | 0x03D0 | 0x0400 | 3.25 | IDATA, READ, DISCARD |
| .reloc | 0x00CC | 0x0200 | 0.66 | 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 |
|---|---|---|
| BYOVD_MemRW | critical | Phys memory mapping + device creation |
| SUSP_PhysMem | high | Physical memory mapping |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1003 | OS Credential Dumping | Credential Access |
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1006 | Direct Volume Access | Defense Evasion |
| T1014 | Rootkit | Defense Evasion |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1071 | Application Layer Protocol | Command and Control |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1542.001 | Pre-OS Boot: System Firmware | Persistence |
| 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 |
| T1601 | Modify System Image | Defense Evasion |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows Hardware Compatibility Publisher |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Third Party Component CA 2014 |
| Serial | 3300000074FF3D4A9E7C401E86000000000074 |
| Valid from | 2025-07-16 20:48 UTC |
| Valid until | 2026-07-14 20:48 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status completed, 20 paths explored at a maximum depth of 20. Vulnerability classes reached: 0. Exploitable paths: 1.
Based on DriverShield static and dynamic analysis, ALSysIO64Legacy.sys shows some suspicious signals and warrants manual review. Its composite risk score is 58/100 (verdict: suspicious). Always validate findings independently before acting.
ALSysIO64Legacy.sys has a DriverShield composite risk score of 58/100, placing it in the suspicious verdict band. SHA256: 8b2884ff88353312811c420a79785df45b89ca44dc35180cdbf6888f324d7ebc.
ALSysIO64Legacy.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 · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas