Analysis of CmBatt.sys: clean verdict, risk score 16/100. 0 YARA matches. SHA256 2097236323694043. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver CmBatt.sys and assigned a verdict of Clean with a composite risk score of 16/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (16/100) |
| YARA matches | 0 |
| File size | 36864 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 209723632369404308ef6df734077a99a295c2e380db85ad1f8498cc8dfbc88a |
| SHA1 | 77597541caaedf91a09f855efe2a2d38fa4fb761 |
| MD5 | e127e772a705cd32be34166f679c61c8 |
Version resource data embedded in the CmBatt.sys PE header, as extracted by the analysis engine.
| File description | Control Method Battery Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | cmbatt.sys |
| Internal name | cmbatt.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 | 48 / 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 CmBatt.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| RtlInitAnsiString | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| ZwQueryValueKey | 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 |
| 0x00226423 | high | METHOD_NEITHER | FILE_DEVICE_UNKNOWN Function #2312 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080FF81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #4064 |
| 0x0080006E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #27 |
| 0x0034341E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #3335 |
| 0x0022A7E8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2554 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x00802494 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2341 |
| 0x00228341 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #208 |
| 0x00808789 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #482 |
| 0x00340398 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #230 |
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 | 0x0EE9 | 0x1000 | 5.62 | CODE, EXEC, READ |
| .rdata | 0x0A00 | 0x0A00 | 4.99 | IDATA, READ |
| .data | 0x0160 | 0x0200 | 0.45 | IDATA, READ, WRITE |
| .pdata | 0x0390 | 0x0400 | 3.87 | IDATA, READ |
| .idata | 0x0B2A | 0x0C00 | 4.2 | IDATA, READ |
| PAGE | 0x4D1A | 0x4E00 | 6.17 | CODE, EXEC, READ |
| INIT | 0x0242 | 0x0400 | 3.92 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x007C | 0x0200 | 1.09 | IDATA, READ, DISCARD |
| .rsrc | 0x0408 | 0x0600 | 2.43 | IDATA, READ, DISCARD |
| .reloc | 0x04AC | 0x0600 | 4.67 | 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 |
| T1569.002 | System Services: Service Execution | Execution |
| 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, CmBatt.sys is assessed as clean, with no notable risk signals. Its composite risk score is 16/100 (verdict: clean). Always validate findings independently before acting.
CmBatt.sys has a DriverShield composite risk score of 16/100, placing it in the clean verdict band. SHA256: 209723632369404308ef6df734077a99a295c2e380db85ad1f8498cc8dfbc88a.
CmBatt.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