wmiacpi.sys - Clean (12/100) - DriverShield Analysis

Analysis of wmiacpi.sys: clean verdict, risk score 12/100. 0 YARA matches. SHA256 98455dd24ae076a2. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

wmiacpi.sys - Analysis Report

DriverShield analyzed the Windows kernel driver wmiacpi.sys and assigned a verdict of Clean with a composite risk score of 12/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (12/100)
YARA matches	0
File size	19456 bytes
Analyzed	2026-03-22
SHA256	98455dd24ae076a2413ea599f83e0894f608c335f3ff2f3624a17e8eaf3b3c42
SHA1	11fb3fe9b395b0be10e60e15ebcb403a71713c94
MD5	e4f25e6e790747073a09f9f8c997889c

Driver identity

Version resource data embedded in the wmiacpi.sys PE header, as extracted by the analysis engine.

File description	Windows Management Interface for ACPI
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	wmiacpi.sys
Internal name	wmiacpi.sys
File version	10.0.19041.1 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 12/100 score breaks down

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	39 / 100
IOCTL dispatch surface	18 / 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 imports (10)

Kernel-mode APIs resolved from the Import Address Table of wmiacpi.sys, ranked by exploitation relevance.

API	Risk	Why it matters
IoDeleteDevice	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
IoBuildDeviceIoControlRequest	low	Standard kernel API - generally benign
KeSetEvent	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
IofCompleteRequest	low	Standard kernel API - generally benign
IoCreateDevice	low	Standard kernel API - generally benign
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
ExFreePool	low	Standard kernel API - generally benign

IOCTL dispatch codes (6)

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
0x00802484	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2337
0x008024A4	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2345
0x00802494	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2341
0x00808389	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #226
0x003403A8	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #234

PE sections

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	0x0A69	0x0C00	5.38	CODE, EXEC, READ
.rdata	0x05D8	0x0600	4.47	IDATA, READ
.data	0x00A0	0x0200	0.28	IDATA, READ, WRITE
.pdata	0x01EC	0x0200	3.89	IDATA, READ
.idata	0x0640	0x0800	3.67	IDATA, READ
PAGE	0x1B19	0x1C00	6.06	CODE, EXEC, READ
INIT	0x0152	0x0200	4.18	CODE, EXEC, READ, DISCARD
GFIDS	0x0054	0x0200	0.75	IDATA, READ, DISCARD
.rsrc	0x0418	0x0600	2.47	IDATA, READ, DISCARD
.reloc	0x0220	0x0400	3.06	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	80 / 100

CFG Enabled - Control Flow Guard is active - indirect calls are validated against a bitmap of valid targets at runtime.
ASLR Enabled - Address Space Layout Randomization is active - base address is randomized on each load.
DEP/NX Enabled - Data Execution Prevention is active - non-executable pages cannot be executed.
Unsigned - The driver is not digitally signed. It requires test signing mode or a bootloader exploit to load on 64-bit Windows.

MITRE ATT&CK techniques (6)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1211	Exploitation for Defense Evasion	Defense Evasion
T1543.003	Windows Service	Persistence
T1553.002	Subvert Trust Controls: Code Signing	Defense Evasion
T1553.006	Code Signing Policy Modification	Defense Evasion
T1569.002	System Services: Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Symbolic execution

Engine angr, status no_findings, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.

Frequently asked questions about wmiacpi.sys

Is wmiacpi.sys safe?

Based on DriverShield static and dynamic analysis, wmiacpi.sys is assessed as clean, with no notable risk signals. Its composite risk score is 12/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of wmiacpi.sys?

wmiacpi.sys has a DriverShield composite risk score of 12/100, placing it in the clean verdict band. SHA256: 98455dd24ae076a2413ea599f83e0894f608c335f3ff2f3624a17e8eaf3b3c42.

What is wmiacpi.sys?

wmiacpi.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.