NdisVirtualBus.sys - Clean (9/100) - DriverShield Analysis

Analysis of NdisVirtualBus.sys: clean verdict, risk score 9/100. 0 YARA matches. SHA256 2960af22637eda95. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

NdisVirtualBus.sys - Analysis Report

DriverShield analyzed the Windows kernel driver NdisVirtualBus.sys and assigned a verdict of Clean with a composite risk score of 9/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (9/100)
YARA matches	0
File size	23040 bytes
Analyzed	2026-03-22
SHA256	2960af22637eda95df6ed154278b23ac157af2de6f342da7d8083e4f7f70730f
SHA1	8dfdb78f1b736f1cc78d8b68b886af66aaebf73f
MD5	31ae9050ff9d6cbe1bc2a7ea5f98d6a3

Driver identity

Version resource data embedded in the NdisVirtualBus.sys PE header, as extracted by the analysis engine.

File description	Microsoft Virtual Network Adapter Enumerator
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	NdisVirtualBus.sys
Internal name	NdisVirtualBus.sys
File version	10.0.19041.1 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 9/100 score breaks down

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	30 / 100
IOCTL dispatch surface	12 / 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 imports (4)

Kernel-mode APIs resolved from the Import Address Table of NdisVirtualBus.sys, ranked by exploitation relevance.

API	Risk	Why it matters
MmGetSystemRoutineAddress	high	Potentially dangerous - could be used for privilege escalation or security bypass
DbgPrintEx	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
ExAllocatePoolWithTag	low	Standard kernel API - generally benign

IOCTL dispatch codes (4)

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
0x00221705	medium	METHOD_IN_DIRECT	FILE_DEVICE_UNKNOWN Function #1473
0x00346408	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #2306
0x003403D8	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #246

PE sections

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	0x1515	0x1600	5.94	CODE, EXEC, READ
.rdata	0x0E90	0x1000	4.96	IDATA, READ
.data	0x0490	0x0200	0.94	IDATA, READ, WRITE
.pdata	0x02F4	0x0400	3.2	IDATA, READ
.idata	0x0304	0x0400	3.32	IDATA, READ
PAGE	0x144F	0x1600	5.89	CODE, EXEC, READ
INIT	0x0203	0x0400	3.67	CODE, EXEC, READ, DISCARD
GFIDS	0x0050	0x0200	0.68	IDATA, READ, DISCARD
.rsrc	0x0618	0x0800	2.64	IDATA, READ, DISCARD
.reloc	0x019C	0x0200	4.05	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	80 / 100

CFG Enabled - Control Flow Guard is active - indirect calls are validated against a bitmap of valid targets at runtime.
ASLR Enabled - Address Space Layout Randomization is active - base address is randomized on each load.
DEP/NX Enabled - Data Execution Prevention is active - non-executable pages cannot be executed.
Unsigned - The driver is not digitally signed. It requires test signing mode or a bootloader exploit to load on 64-bit Windows.

MITRE ATT&CK techniques (5)

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
T1652	Device Driver Discovery	Discovery

Symbolic execution

Engine angr, status no_findings, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.

Frequently asked questions about NdisVirtualBus.sys

Is NdisVirtualBus.sys safe?

Based on DriverShield static and dynamic analysis, NdisVirtualBus.sys is assessed as clean, with no notable risk signals. Its composite risk score is 9/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of NdisVirtualBus.sys?

NdisVirtualBus.sys has a DriverShield composite risk score of 9/100, placing it in the clean verdict band. SHA256: 2960af22637eda95df6ed154278b23ac157af2de6f342da7d8083e4f7f70730f.

What is NdisVirtualBus.sys?

NdisVirtualBus.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.