drmkaud.sys - Clean (5/100) - DriverShield Analysis

Analysis of drmkaud.sys: clean verdict, risk score 5/100. 0 YARA matches. SHA256 315b043ad2f93840. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

drmkaud.sys - Analysis Report

DriverShield analyzed the Windows kernel driver drmkaud.sys and assigned a verdict of Clean with a composite risk score of 5/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (5/100)
YARA matches	0
File size	17360 bytes
Code-signing signer	Microsoft Windows
Analyzed	2026-03-22
SHA256	315b043ad2f93840e0b39c18db37fcd1b14007fed7c97b3e53df5c1606ac0272
SHA1	a7869d4ff9a5f770fdcce8dbd5e469973f2dba94
MD5	b6f325210ecab8a5ee8671c7c60ea76b

Driver identity

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

File description	Microsoft Trusted Audio Drivers
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	drmkaud.sys
Internal name	drmkaud.sys
File version	10.0.19041.5072 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 5/100 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	6 / 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

IOCTL dispatch codes (2)

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
0x003403A8	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #234

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	0x0075	0x0200	1.24	CODE, EXEC, READ
.rdata	0x0360	0x0400	2.83	IDATA, READ
.data	0x0098	0x0200	0.28	IDATA, READ, WRITE
.pdata	0x0054	0x0200	0.69	IDATA, READ
.idata	0x00D2	0x0200	1.39	IDATA, READ
INIT	0x00D2	0x0200	2.81	CODE, EXEC, READ, DISCARD
GFIDS	0x000C	0x0200	0.12	IDATA, READ, DISCARD
.rsrc	0x0410	0x0600	2.5	IDATA, READ, DISCARD
.reloc	0x005C	0x0200	0.58	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	85 / 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.
Expired Certificate - The driver is signed but the certificate has expired. Windows may still load it depending on revocation policy.

MITRE ATT&CK techniques (3)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1071	Application Layer Protocol	Command and Control
T1543.003	Windows Service	Persistence
T1652	Device Driver Discovery	Discovery

Code-signing chain

Signer	Microsoft Windows
Signer organisation	Microsoft Corporation
Issuer	Microsoft Windows Production PCA 2011
Serial	330000045FF3C96C1A7FF7DA1D00000000045F
Valid from	2023-11-16 19:20 UTC
Valid until	2024-11-14 19:20 UTC (expired)
Signature validity	Not verified

Certificate revision: 0x0200
Certificate type: PKCS#7
Chain: Microsoft Windows Production PCA 2011

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 drmkaud.sys

Is drmkaud.sys safe?

Based on DriverShield static and dynamic analysis, drmkaud.sys is assessed as clean, with no notable risk signals. Its composite risk score is 5/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of drmkaud.sys?

drmkaud.sys has a DriverShield composite risk score of 5/100, placing it in the clean verdict band. SHA256: 315b043ad2f93840e0b39c18db37fcd1b14007fed7c97b3e53df5c1606ac0272.

What is drmkaud.sys?

drmkaud.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