Analysis of acpipagr.sys: clean verdict, risk score 8/100. 0 YARA matches. SHA256 3a9a504797fd22bb. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver acpipagr.sys and assigned a verdict of Clean with a composite risk score of 8/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (8/100) |
| YARA matches | 0 |
| File size | 14336 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 3a9a504797fd22bb5447bb36597d5001320abc0d4a1853d478c038eac6847913 |
| SHA1 | b957768e33c023ee6281f106f43809da3c0f9a63 |
| MD5 | ef7cb34fb2d56305ef942012499ab8f7 |
Version resource data embedded in the acpipagr.sys PE header, as extracted by the analysis engine.
| File description | ACPI Processor Aggregator Device Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | acpipagr.sys |
| Internal name | acpipagr.sys |
| File version | 10.0.19041.1 (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 | 15 / 100 |
| IOCTL dispatch surface | 24 / 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 acpipagr.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| DbgPrintEx | 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 |
|---|---|---|---|
| 0x00806583 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #2400 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080FA81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3744 |
| 0x0022070D | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #451 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x0080B18D | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3171 |
| 0x00801440 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #1296 |
| 0x003403B4 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #237 |
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 | 0x0729 | 0x0800 | 5.47 | CODE, EXEC, READ |
| .rdata | 0x09A0 | 0x0A00 | 5.12 | IDATA, READ |
| .data | 0x0378 | 0x0200 | 0.72 | IDATA, READ, WRITE |
| .pdata | 0x0138 | 0x0200 | 2.5 | IDATA, READ |
| .idata | 0x033A | 0x0400 | 3.54 | IDATA, READ |
| PAGE | 0x0C3C | 0x0E00 | 5.57 | CODE, EXEC, READ |
| INIT | 0x00AE | 0x0200 | 2.58 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x002C | 0x0200 | 0.41 | IDATA, READ, DISCARD |
| .rsrc | 0x0428 | 0x0600 | 2.49 | IDATA, READ, DISCARD |
| .reloc | 0x0138 | 0x0200 | 3.16 | 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 |
|---|---|---|
| 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 |
| 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, acpipagr.sys is assessed as clean, with no notable risk signals. Its composite risk score is 8/100 (verdict: clean). Always validate findings independently before acting.
acpipagr.sys has a DriverShield composite risk score of 8/100, placing it in the clean verdict band. SHA256: 3a9a504797fd22bb5447bb36597d5001320abc0d4a1853d478c038eac6847913.
acpipagr.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