acpitime.sys - Clean (4/100) - DriverShield Analysis

Analysis of acpitime.sys: clean verdict, risk score 4/100. 0 YARA matches. SHA256 72d35f5db8714d38. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

acpitime.sys - Analysis Report

DriverShield analyzed the Windows kernel driver acpitime.sys and assigned a verdict of Clean with a composite risk score of 4/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (4/100)
YARA matches	0
File size	16384 bytes
Analyzed	2026-03-22
SHA256	72d35f5db8714d38e4050a7f7a457c4ad99e3ea212040704f1c1ecbb70e865e9
SHA1	5299d5fd443eaef31edeae9ad5e432ba7fc7e83b
MD5	85a86944a6163f0b7a8b10203b70cb9a

Driver identity

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

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

How the 4/100 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	0 / 100
IOCTL dispatch surface	12 / 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 (2)

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

API	Risk	Why it matters
DbgPrintEx	low	Standard kernel API - generally benign
DbgPrint	low	Standard kernel API - generally benign

IOCTL dispatch codes (4)

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
0x0022BB07	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #3777
0x002200F0	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #60
0x00223B0D	medium	METHOD_IN_DIRECT	FILE_DEVICE_UNKNOWN Function #3779
0x00340384	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #225

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	5.51	CODE, EXEC, READ
.rdata	0x0A68	0x0C00	4.77	IDATA, READ
.data	0x0368	0x0200	0.72	IDATA, READ, WRITE
.pdata	0x0174	0x0200	3.02	IDATA, READ
.idata	0x01A8	0x0200	3.15	IDATA, READ
PAGE	0x134E	0x1400	6.04	CODE, EXEC, READ
INIT	0x00A2	0x0200	2.46	CODE, EXEC, READ, DISCARD
GFIDS	0x002C	0x0200	0.41	IDATA, READ, DISCARD
.rsrc	0x03F8	0x0400	3.28	IDATA, READ, DISCARD
.reloc	0x0124	0x0200	2.97	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 (3)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1543.003	Windows Service	Persistence
T1553.006	Code Signing Policy Modification	Defense Evasion
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 acpitime.sys

Is acpitime.sys safe?

Based on DriverShield static and dynamic analysis, acpitime.sys is assessed as clean, with no notable risk signals. Its composite risk score is 4/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of acpitime.sys?

acpitime.sys has a DriverShield composite risk score of 4/100, placing it in the clean verdict band. SHA256: 72d35f5db8714d38e4050a7f7a457c4ad99e3ea212040704f1c1ecbb70e865e9.

What is acpitime.sys?

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