bcmfn2.sys - Clean (4/100) - DriverShield Analysis

Analysis of bcmfn2.sys: clean verdict, risk score 4/100. 0 YARA matches. SHA256 9ad12e18a042c5b8. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

bcmfn2.sys - Analysis Report

DriverShield analyzed the Windows kernel driver bcmfn2.sys and assigned a verdict of Clean with a composite risk score of 4/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (4/100)
YARA matches	0
File size	9728 bytes
Analyzed	2026-03-22
SHA256	9ad12e18a042c5b8efb19297bc2e7bd1fef75a138fefb64c6bf0261fd3e53ab1
SHA1	8e830af8cddacee01d44747352ab62418665248d
MD5	739d089777d2b66dbe7201e5ea4ba2d7

Driver identity

Version resource data embedded in the bcmfn2.sys PE header, as extracted by the analysis engine.

File description	BCM Function 2 Device Driver
Product	Windows (R) Win 7 DDK driver
Company	Windows (R) Win 7 DDK provider
Original filename	bcmfn2.sys
Internal name	bcmfn2.sys
File version	6.3.9600.17336
Copyright	© Broadcom Corporation. All rights reserved.

How the 4/100 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	0 / 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 imports (4)

Kernel-mode APIs resolved from the Import Address Table of bcmfn2.sys, ranked by exploitation relevance.

API	Risk	Why it matters
KeSetEvent	low	Standard kernel API - generally benign
IofCompleteRequest	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign

IOCTL dispatch codes (3)

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
0x00343420	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #3336
0x00340378	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #222

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	0x0A5B	0x0C00	5.55	CODE, EXEC, READ
.rdata	0x039C	0x0400	3.04	IDATA, READ
.data	0x1088	0x0200	0.72	IDATA, READ, WRITE
.pdata	0x00FC	0x0200	2.05	IDATA, READ
PAGE	0x0295	0x0400	4.47	CODE, EXEC, READ
INIT	0x02DA	0x0400	4.08	CODE, EXEC, READ, WRITE, DISCARD
.rsrc	0x03D8	0x0400	3.34	IDATA, READ, DISCARD
.reloc	0x0060	0x0200	0.3	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Not enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	50 / 100

No CFG - Control Flow Guard is not enabled. Indirect call targets are not validated, making the driver susceptible to control flow hijacking via corrupted function pointers or vtables.
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 (3)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1543.003	Windows Service	Persistence
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 bcmfn2.sys

Is bcmfn2.sys safe?

Based on DriverShield static and dynamic analysis, bcmfn2.sys is assessed as clean, with no notable risk signals. Its composite risk score is 4/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of bcmfn2.sys?

bcmfn2.sys has a DriverShield composite risk score of 4/100, placing it in the clean verdict band. SHA256: 9ad12e18a042c5b8efb19297bc2e7bd1fef75a138fefb64c6bf0261fd3e53ab1.

What is bcmfn2.sys?

bcmfn2.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.