Analysis of cmimcext.sys: clean verdict, risk score 13/100. 0 YARA matches. SHA256 91002bd3b00b8248. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver cmimcext.sys and assigned a verdict of Clean with a composite risk score of 13/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (13/100) |
| YARA matches | 0 |
| File size | 30176 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-03-22 |
| SHA256 | 91002bd3b00b8248cd96db22e2af0eff28c02b2e496ff39bfcc5472e21bf7345 |
| SHA1 | 94bbad9b927a9ebbc821ce1591ac442a365f69e3 |
| MD5 | 733956724c1fae3c1facdb1665df92d9 |
Version resource data embedded in the cmimcext.sys PE header, as extracted by the analysis engine.
| File description | Kernel Configuration Manager Initial Configuration Extension Host Export Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | cmimcext.sys |
| Internal name | cmimcext.sys |
| File version | 10.0.19041.3636 (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 | 42 / 100 |
| IOCTL dispatch surface | 9 / 100 |
| Known-vulnerable corpus | 0 / 100 |
| Code-signing state | 80 / 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 cmimcext.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| ZwCreateKey | medium | Moderate risk - system modification capability |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| ZwOpenKey | 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 |
|---|---|---|---|
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00340410 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #260 |
| 0x00340025 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #9 |
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 | 0x0569 | 0x0600 | 5.57 | CODE, EXEC, READ |
| .rdata | 0x0550 | 0x0600 | 3.77 | IDATA, READ |
| .data | 0x01A0 | 0x0200 | 0.92 | IDATA, READ, WRITE |
| .pdata | 0x0144 | 0x0200 | 2.69 | IDATA, READ |
| .idata | 0x0250 | 0x0400 | 2.66 | IDATA, READ |
| INITCONS | 0x02C0 | 0x0400 | 2.43 | IDATA, READ |
| PAGE | 0x0E9B | 0x1000 | 5.79 | CODE, EXEC, READ |
| .edata | 0x0090 | 0x0200 | 1.64 | IDATA, READ |
| INIT | 0x09F2 | 0x0A00 | 6.04 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0024 | 0x0200 | 0.32 | IDATA, READ, DISCARD |
| .rsrc | 0x1208 | 0x1400 | 3.38 | IDATA, READ, DISCARD |
| .reloc | 0x018C | 0x0200 | 3.71 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 85 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1071 | Application Layer Protocol | Command and Control |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1543.003 | Windows Service | Persistence |
| T1547.001 | Registry Run Keys | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | Defense Evasion |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Production PCA 2011 |
| Serial | 33000004158295A1A3D82E2857000000000415 |
| Valid from | 2023-02-03 00:05 UTC |
| Valid until | 2024-02-01 00:05 UTC (expired) |
| Signature validity | Not verified |
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, cmimcext.sys is assessed as clean, with no notable risk signals. Its composite risk score is 13/100 (verdict: clean). Always validate findings independently before acting.
cmimcext.sys has a DriverShield composite risk score of 13/100, placing it in the clean verdict band. SHA256: 91002bd3b00b8248cd96db22e2af0eff28c02b2e496ff39bfcc5472e21bf7345.
cmimcext.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Microsoft Windows.
Related: Other drivers signed by Microsoft Windows · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas