Analysis of errdev.sys: clean verdict, risk score 16/100. 1 YARA match. SHA256 bf14db2762b48ace. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver errdev.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 | 1 |
| File size | 15872 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | bf14db2762b48ace54977e98dc2a4060b8b1122b58fdefbb4c84546abeb410a5 |
| SHA1 | 3fca3ee9c39e34e93714bab5f2e60472dbfac46d |
| MD5 | e87f3fa1f9133deec1b3692976487777 |
Version resource data embedded in the errdev.sys PE header, as extracted by the analysis engine.
| File description | Error Device Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | errdev.sys |
| Internal name | errdev.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 | 45 / 100 |
| IOCTL dispatch surface | 9 / 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 errdev.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmUnmapIoSpace | medium | Moderate risk - system modification capability |
| 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 |
|---|---|---|---|
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00227315 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3269 |
| 0x00340384 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #225 |
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 | 0x1469 | 0x1600 | 5.74 | CODE, EXEC, READ |
| .rdata | 0x0978 | 0x0A00 | 5.01 | IDATA, READ |
| .data | 0x0440 | 0x0200 | 0.97 | IDATA, READ, WRITE |
| .pdata | 0x0144 | 0x0200 | 2.63 | IDATA, READ |
| .idata | 0x036A | 0x0400 | 3.7 | IDATA, READ |
| PAGE | 0x0620 | 0x0800 | 5.1 | CODE, EXEC, READ |
| INIT | 0x011A | 0x0200 | 3.6 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0034 | 0x0200 | 0.47 | IDATA, READ, DISCARD |
| .rsrc | 0x03F8 | 0x0400 | 3.27 | IDATA, READ, DISCARD |
| .reloc | 0x01D0 | 0x0200 | 4.43 | 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, errdev.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.
errdev.sys has a DriverShield composite risk score of 16/100, placing it in the clean verdict band. SHA256: bf14db2762b48ace54977e98dc2a4060b8b1122b58fdefbb4c84546abeb410a5.
errdev.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