mstee.sys - Clean (6/100) - DriverShield Analysis

Analysis of mstee.sys: clean verdict, risk score 6/100. 0 YARA matches. SHA256 808ff81f0030cc73. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

mstee.sys - Analysis Report

DriverShield analyzed the Windows kernel driver mstee.sys and assigned a verdict of Clean with a composite risk score of 6/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (6/100)
YARA matches	0
File size	12288 bytes
Analyzed	2026-03-22
SHA256	808ff81f0030cc7390b4790f91ce1763eac02cceca6014a2d9d990a40dbd0580
SHA1	735b7bbcfe722f19b0062611b40f238fe1d40eb4
MD5	244c73253e165582ddc43af4467d23df

Driver identity

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

File description	WDM Tee/Communication Transform Filter
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	mstee.sys
Internal name	mstee.sys
File version	10.0.19041.1 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 6/100 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	15 / 100
IOCTL dispatch surface	6 / 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 (2)

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

API	Risk	Why it matters
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
ExFreePool	low	Standard kernel API - generally benign

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
0x003403A4	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #233

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	0x03EA	0x0400	5.36	CODE, EXEC, READ
.rdata	0x03F0	0x0400	3.69	IDATA, READ
.data	0x0090	0x0200	0.28	IDATA, READ, WRITE
.pdata	0x00A8	0x0200	1.37	IDATA, READ
.idata	0x020A	0x0400	2.25	IDATA, READ
.guids	0x0080	0x0200	1.85	IDATA, READ
PAGE	0x07EB	0x0800	6.07	CODE, EXEC, READ
PAGECONS	0x0500	0x0600	1.43	IDATA, READ
INIT	0x0092	0x0200	2.1	CODE, EXEC, READ, DISCARD
GFIDS	0x001C	0x0200	0.27	IDATA, READ, DISCARD
.rsrc	0x0418	0x0600	2.44	IDATA, READ, DISCARD
.reloc	0x0114	0x0200	2.7	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 mstee.sys

Is mstee.sys safe?

Based on DriverShield static and dynamic analysis, mstee.sys is assessed as clean, with no notable risk signals. Its composite risk score is 6/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of mstee.sys?

mstee.sys has a DriverShield composite risk score of 6/100, placing it in the clean verdict band. SHA256: 808ff81f0030cc7390b4790f91ce1763eac02cceca6014a2d9d990a40dbd0580.

What is mstee.sys?

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