Analysis of WdBoot.sys: suspicious verdict, risk score 30/100. 0 YARA matches, 0/74 multi-engine detections. SHA256 0845344f7bfaa94a. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver WdBoot.sys and assigned a verdict of Suspicious with a composite risk score of 30/100, indicating some risk signals warranting review (30-59 band).
| Verdict | Suspicious (30/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 74 |
| File size | 46688 bytes |
| Code-signing signer | Microsoft Windows Early Launch Anti-malware Publisher |
| Analyzed | 2026-10-10 |
| SHA256 | 0845344f7bfaa94af90920a5346078e6261eea3a1a77795dda5b70b38609348b |
| SHA1 | e9946c463109418520f608edd3a681b23ae0f626 |
| MD5 | 5925250bddb94b0a5fa0e7feed36c520 |
Version resource data embedded in the WdBoot.sys PE header, as extracted by the analysis engine.
| File description | Microsoft antimalware boot driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | WdBoot.sys |
| Internal name | WdBoot |
| File version | 4.18.1909.6 (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 | 93 / 100 |
| IOCTL dispatch surface | 69 / 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 WdBoot.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| CmRegisterCallback | medium | Moderate risk - system modification capability |
| ZwQuerySystemInformation | medium | Moderate risk - system modification capability |
| RtlInitAnsiString | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| ZwOpenKey | 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 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x00223F3D | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #4047 |
| 0x0022133D | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #1231 |
| 0x00228B35 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #717 |
| 0x00340032 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #12 |
| 0x0022341E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #3335 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x0080B941 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3664 |
| 0x00343D5E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #3927 |
| 0x0034FB81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3808 |
| 0x00340394 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #229 |
| 0x0022006C | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #27 |
| 0x00340066 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #25 |
| 0x00340061 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #24 |
| 0x0034002E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #11 |
| 0x00340034 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #13 |
| 0x00340039 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #14 |
| 0x00340035 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #13 |
| 0x00340031 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #12 |
| 0x00340038 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #14 |
| 0x00340044 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #17 |
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 | 0x1B69 | 0x1C00 | 6.38 | CODE, EXEC, READ |
| .rdata | 0x0FA4 | 0x1000 | 4.93 | IDATA, READ |
| .data | 0x01A0 | 0x0200 | 0.44 | IDATA, READ, WRITE |
| .pdata | 0x0348 | 0x0400 | 3.67 | IDATA, READ |
| .idata | 0x06C8 | 0x0800 | 3.89 | IDATA, READ |
| PAGE | 0x3083 | 0x3200 | 6.22 | CODE, EXEC, READ |
| INIT | 0x13A9 | 0x1400 | 6.16 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0020 | 0x0200 | 0.32 | IDATA, READ, DISCARD |
| .rsrc | 0x09E8 | 0x0A00 | 3.48 | IDATA, READ, DISCARD |
| .reloc | 0x0310 | 0x0400 | 4.16 | 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 |
|---|---|---|
| T1014 | Rootkit | Defense Evasion |
| 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 |
| T1562.006 | Indicator Blocking | Defense Evasion |
| T1564.001 | Hidden Files and Directories | Defense Evasion |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows Early Launch Anti-malware Publisher |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Code Signing PCA 2010 |
| Serial | 33000002B3ACDF0C8A8EB8FC9B0000000002B3 |
| Valid from | 2019-03-27 19:20 UTC |
| Valid until | 2020-03-27 19:20 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status static_approximation, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 1.
Based on DriverShield static and dynamic analysis, WdBoot.sys shows some suspicious signals and warrants manual review. Its composite risk score is 30/100 (verdict: suspicious). Always validate findings independently before acting.
WdBoot.sys has a DriverShield composite risk score of 30/100, placing it in the suspicious verdict band. SHA256: 0845344f7bfaa94af90920a5346078e6261eea3a1a77795dda5b70b38609348b.
WdBoot.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 Early Launch Anti-malware Publisher.
Related: Other drivers signed by Microsoft Windows Early Launch Anti-malware Publisher · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas