Analysis of UcmUcsiAcpiClient.sys: clean verdict, risk score 22/100. 1 YARA match. SHA256 3626760aee42ee36. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver UcmUcsiAcpiClient.sys and assigned a verdict of Clean with a composite risk score of 22/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (22/100) |
| YARA matches | 1 |
| File size | 36864 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 3626760aee42ee36e047da6899a81e0646dfba344a234270eae5d635f049be37 |
| SHA1 | 39b846d777767ebf8403afd9e8f5079ceeb32e35 |
| MD5 | 7fdc3a6fd8547468ce554c8821640103 |
Version resource data embedded in the UcmUcsiAcpiClient.sys PE header, as extracted by the analysis engine.
| File description | UCM-UCSI ACPI Client Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | UcmUcsiAcpiClient.sys |
| Internal name | UcmUcsiAcpiClient.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 | 30 / 100 |
| Dangerous kernel imports | 60 / 100 |
| IOCTL dispatch surface | 36 / 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 UcmUcsiAcpiClient.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| MmUnmapIoSpace | medium | Moderate risk - system modification capability |
| DbgPrintEx | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | 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 |
|---|---|---|---|
| 0x0022BB07 | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3777 |
| 0x0022011F | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #71 |
| 0x0022741F | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #3335 |
| 0x98760D8B | high | METHOD_NEITHER | CUSTOM_PROCESS Function #866 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00349705 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #1473 |
| 0x008024AC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2347 |
| 0x0034B941 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3664 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x0022B941 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3664 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x003403BC | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #239 |
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 | 0x2369 | 0x2400 | 5.96 | CODE, EXEC, READ |
| .rdata | 0x0F90 | 0x1000 | 5.45 | IDATA, READ |
| .data | 0x04D0 | 0x0200 | 1.21 | IDATA, READ, WRITE |
| .pdata | 0x042C | 0x0600 | 3.25 | IDATA, READ |
| .idata | 0x036C | 0x0400 | 3.6 | IDATA, READ |
| PAGE | 0x3AF1 | 0x3C00 | 6.13 | CODE, EXEC, READ |
| INIT | 0x021E | 0x0400 | 3.83 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x006C | 0x0200 | 0.92 | IDATA, READ, DISCARD |
| .rsrc | 0x0430 | 0x0600 | 2.53 | IDATA, READ, DISCARD |
| .reloc | 0x0260 | 0x0400 | 3.71 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 80 / 100 |
| Rule | Severity | Detects |
|---|---|---|
| SUSP_PhysMem | high | Physical memory mapping |
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 |
| 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, UcmUcsiAcpiClient.sys is assessed as clean, with no notable risk signals. Its composite risk score is 22/100 (verdict: clean). Always validate findings independently before acting.
UcmUcsiAcpiClient.sys has a DriverShield composite risk score of 22/100, placing it in the clean verdict band. SHA256: 3626760aee42ee36e047da6899a81e0646dfba344a234270eae5d635f049be37.
UcmUcsiAcpiClient.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 · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas