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

Analysis of umpass.sys: clean verdict, risk score 6/100. 0 YARA matches. SHA256 3062b25a7747bc41. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

umpass.sys - Analysis Report

DriverShield analyzed the Windows kernel driver umpass.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	15360 bytes
Analyzed	2026-03-22
SHA256	3062b25a7747bc417e1d498db1b11c9631d80f57e4a048101ef5aa26206ae838
SHA1	325fb0863b939f90b6e7edd08ce254293a943c0c
MD5	493af687e60e144f59e3f5b7e27aa39b

Driver identity

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

File description	Generic pass-through driver
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	fumpass.sys
Internal name	umpass.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 (3)

Kernel-mode APIs resolved from the Import Address Table of umpass.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

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
0x00340394	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #229

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	0x0B29	0x0C00	5.76	CODE, EXEC, READ
.rdata	0x0A68	0x0C00	4.58	IDATA, READ
.data	0x03C8	0x0200	0.62	IDATA, READ, WRITE
.pdata	0x0150	0x0200	2.72	IDATA, READ
.idata	0x0208	0x0400	2.3	IDATA, READ
PAGE	0x0AD7	0x0C00	5.79	CODE, EXEC, READ
INIT	0x014E	0x0200	4.34	CODE, EXEC, READ, DISCARD
GFIDS	0x0020	0x0200	0.31	IDATA, READ, DISCARD
.rsrc	0x0408	0x0600	2.42	IDATA, READ, DISCARD
.reloc	0x0124	0x0200	2.86	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 umpass.sys

Is umpass.sys safe?

Based on DriverShield static and dynamic analysis, umpass.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 umpass.sys?

umpass.sys has a DriverShield composite risk score of 6/100, placing it in the clean verdict band. SHA256: 3062b25a7747bc417e1d498db1b11c9631d80f57e4a048101ef5aa26206ae838.

What is umpass.sys?

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