Analysis of netbios.sys: clean verdict, risk score 26/100. 0 YARA matches, 0/75 multi-engine detections. SHA256 29c10b2bd9c7272c. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver netbios.sys and assigned a verdict of Clean with a composite risk score of 26/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (26/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 75 |
| File size | 99632 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-10-11 |
| SHA256 | 29c10b2bd9c7272c7c71462f39252a75de0159eccfc58bdf1c407d8c226f0afc |
| SHA1 | ec099ba1625a5dc0667ea1d8ac8598b9a6d97355 |
| MD5 | dcb8d72d796a8f7b4173f8c378ee39ef |
Version resource data embedded in the netbios.sys PE header, as extracted by the analysis engine.
| File description | NetBIOS interface driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | NETBIOS.SYS |
| Internal name | NETBIOS.SYS |
| File version | 10.0.26100.1 (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 | 100 / 100 |
| IOCTL dispatch surface | 27 / 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 netbios.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPagesSpecifyCache | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| ZwCreateKey | medium | Moderate risk - system modification capability |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| ProbeForRead | low | Standard kernel API - generally benign |
| ExAllocatePool2 | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| ZwCreateFile | low | Standard kernel API - generally benign |
| ProbeForWrite | low | Standard kernel API - generally benign |
| ZwOpenKey | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | 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 |
|---|---|---|---|
| 0x0080AE8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #2978 |
| 0x0080838B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #226 |
| 0x0080A383 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #2272 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00342464 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #2329 |
| 0x00809589 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #1378 |
| 0x0022BC41 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3856 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x00340390 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #228 |
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 | 0x5F77 | 0x6000 | 6.13 | CODE, EXEC, READ |
| fothk | 0x1000 | 0x1000 | 0.02 | CODE, EXEC, READ |
| .rdata | 0x10DC | 0x2000 | 3.01 | IDATA, READ |
| .data | 0x0460 | 0x1000 | 0.29 | IDATA, READ, WRITE |
| .pdata | 0x0720 | 0x1000 | 2.46 | IDATA, READ |
| .idata | 0x091A | 0x1000 | 2.97 | IDATA, READ |
| PAGE | 0x4C2B | 0x5000 | 5.9 | CODE, EXEC, READ |
| INIT | 0x0480 | 0x1000 | 2.28 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0064 | 0x1000 | 0.16 | IDATA, READ, DISCARD |
| .rsrc | 0x05E0 | 0x1000 | 1.45 | IDATA, READ, DISCARD |
| .reloc | 0x0CE8 | 0x1000 | 4.75 | 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 |
|---|---|---|
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1055.001 | Process Injection: DLL Injection | Defense Evasion |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1071 | Application Layer Protocol | Command and Control |
| T1489 | Service Stop | Impact |
| T1543.003 | Windows Service | Persistence |
| T1562.001 | Impair Defenses: Disable/Modify Tools | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Production PCA 2011 |
| Serial | 3300000460CF42A912315F6FB3000000000460 |
| Valid from | 2023-11-16 19:20 UTC |
| Valid until | 2024-11-14 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: 1. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, netbios.sys is assessed as clean, with no notable risk signals. Its composite risk score is 26/100 (verdict: clean). Always validate findings independently before acting.
netbios.sys has a DriverShield composite risk score of 26/100, placing it in the clean verdict band. SHA256: 29c10b2bd9c7272c7c71462f39252a75de0159eccfc58bdf1c407d8c226f0afc.
netbios.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