mcd.sys - Clean (20/100) - DriverShield Analysis

Analysis of mcd.sys: clean verdict, risk score 20/100. 0 YARA matches. SHA256 1a4ec9cbd887ef15. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

mcd.sys - Analysis Report

DriverShield analyzed the Windows kernel driver mcd.sys and assigned a verdict of Clean with a composite risk score of 20/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (20/100)
YARA matches	0
File size	25088 bytes
Analyzed	2026-03-22
SHA256	1a4ec9cbd887ef15a5c3c6dc9b62e5d5dddaa10503dee8a8ed75d61915510e68
SHA1	02ce9d42f86437b073dc99c9d3e6e50deb44d944
MD5	0b0781d75a0b5059d10ced0b4436fe02

Driver identity

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

File description	Medium changer class driver
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	Mcd.sys
Internal name	Mcd.sys
File version	10.0.19041.1 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 20/100 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	75 / 100
IOCTL dispatch surface	27 / 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 (14)

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

API	Risk	Why it matters
ZwSetValueKey	medium	Moderate risk - system modification capability
ZwCreateKey	medium	Moderate risk - system modification capability
ZwDeleteKey	medium	Moderate risk - system modification capability
ZwClose	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
ZwOpenKey	low	Standard kernel API - generally benign
ZwQueryValueKey	low	Standard kernel API - generally benign
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
IoCreateSymbolicLink	low	Standard kernel API - generally benign
IoDeleteDevice	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
IoBuildDeviceIoControlRequest	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
IoDeleteSymbolicLink	low	Standard kernel API - generally benign

IOCTL dispatch codes (9)

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
0x0080850F	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #323
0x002200F0	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #60
0x0080EC81	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #2848
0x0022A305	medium	METHOD_IN_DIRECT	FILE_DEVICE_UNKNOWN Function #2241
0x00803D0C	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #3907
0x0080B841	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #3600
0x00343D18	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #3910
0x00343D34	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #3917
0x00340384	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #225

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	0x1569	0x1600	6.09	CODE, EXEC, READ
.rdata	0x08E8	0x0A00	4.18	IDATA, READ
.data	0x00E0	0x0200	1.32	IDATA, READ, WRITE
.pdata	0x0234	0x0400	2.53	IDATA, READ
.idata	0x0836	0x0A00	3.85	IDATA, READ
PAGE	0x1EF2	0x2000	6.02	CODE, EXEC, READ
.edata	0x00DD	0x0200	2.5	IDATA, READ
INIT	0x0082	0x0200	1.82	CODE, EXEC, READ, DISCARD
GFIDS	0x0074	0x0200	0.89	IDATA, READ, DISCARD
.rsrc	0x03F8	0x0400	3.27	IDATA, READ, DISCARD
.reloc	0x0294	0x0400	3.77	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 (8)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
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
T1553.006	Code Signing Policy Modification	Defense Evasion
T1569.002	System Services: Service Execution	Execution
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 mcd.sys

Is mcd.sys safe?

Based on DriverShield static and dynamic analysis, mcd.sys is assessed as clean, with no notable risk signals. Its composite risk score is 20/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of mcd.sys?

mcd.sys has a DriverShield composite risk score of 20/100, placing it in the clean verdict band. SHA256: 1a4ec9cbd887ef15a5c3c6dc9b62e5d5dddaa10503dee8a8ed75d61915510e68.

What is mcd.sys?

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