winio64.sys - Suspicious (58/100) - DriverShield Analysis

Analysis of winio64.sys: suspicious verdict, risk score 58/100. 0 YARA matches, 1/75 multi-engine detections. SHA256 e1980c6592e6d2d9. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

winio64.sys - Analysis Report

DriverShield analyzed the Windows kernel driver winio64.sys and assigned a verdict of Suspicious with a composite risk score of 58/100, indicating some risk signals warranting review (30-59 band).

Verdict	Suspicious (58/100)
YARA matches	0
Multi-engine detections	1 / 75
File size	17080 bytes
Code-signing signer	Symantec Time Stamping Services CA - G2
Analyzed	2026-09-06
SHA256	e1980c6592e6d2d92c1a65acad8f1071b6a404097bb6fcce494f3c8ac31385cf
SHA1	943593e880b4d340f2548548e6e673ef6f61eed3
MD5	97221e16e7a99a00592ca278c49ffbfc

How the 58/100 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	78 / 100
IOCTL dispatch surface	6 / 100
Known-vulnerable corpus	100 / 100
Code-signing state	80 / 100
Packing and entropy	0 / 100
Dynamic behaviour	0 / 100
CVE cross-reference	0 / 100

Kernel imports (10)

Kernel-mode APIs resolved from the Import Address Table of winio64.sys, ranked by exploitation relevance.

API	Risk	Why it matters
ZwMapViewOfSection	critical	Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination
KeBugCheckEx	medium	Moderate risk - system modification capability
ObReferenceObjectByHandle	medium	Moderate risk - system modification capability
IofCompleteRequest	low	Standard kernel API - generally benign
IoCreateDevice	low	Standard kernel API - generally benign
IoDeleteSymbolicLink	low	Standard kernel API - generally benign
IoCreateSymbolicLink	low	Standard kernel API - generally benign
ZwClose	low	Standard kernel API - generally benign
IoDeleteDevice	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
0x008010B9	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #1070

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	0x0DBE	0x0E00	6	CODE, EXEC, READ
.rdata	0x02B4	0x0400	2.88	IDATA, READ
.data	0x1028	0x0200	0.63	IDATA, READ, WRITE
.pdata	0x00C0	0x0200	1.67	IDATA, READ
INIT	0x0326	0x0400	4.16	CODE, EXEC, READ, WRITE, DISCARD
.reloc	0x0030	0x0200	0.22	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Not enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	55 / 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.
Expired Certificate - The driver is signed but the certificate has expired. Windows may still load it depending on revocation policy.

MITRE ATT&CK techniques (8)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1003.001	OS Credential Dumping: LSASS Memory	Credential Access
T1055.012	Process Hollowing	Defense Evasion
T1068	Exploitation for Privilege Escalation	Privilege Escalation
T1071	Application Layer Protocol	Command and Control
T1543.003	Windows Service	Persistence
T1562.001	Impair Defenses	Defense Evasion
T1569.002	Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Code-signing chain

Signer	Symantec Time Stamping Services CA - G2
Signer organisation	Symantec Corporation
Issuer	Thawte Timestamping CA
Serial	7E93EBFB7CC64E59EA4B9A77D406FC3B
Valid from	2012-12-21 00:00 UTC
Valid until	2020-12-30 23:59 UTC (expired)
Signature validity	Not verified

Certificate revision: 0x0200
Certificate type: PKCS#7
Chain: Symantec Time Stamping Services Signer - G4
Chain: StartCom Certification Authority
Chain: StartCom Class 3 Primary Intermediate Object CA
Chain: Exacq Technologies, Inc.

Symbolic execution

Engine angr, status completed, 43 paths explored at a maximum depth of 43. Vulnerability classes reached: 1. Exploitable paths: 0.

Corpus match: this hash is present in the known-vulnerable driver corpus DriverShield cross-references during analysis, which is why the score carries a full weighting on that component.

Frequently asked questions about winio64.sys

Is winio64.sys safe?

Based on DriverShield static and dynamic analysis, winio64.sys shows some suspicious signals and warrants manual review. Its composite risk score is 58/100 (verdict: suspicious). Always validate findings independently before acting.

What is the risk score of winio64.sys?

winio64.sys has a DriverShield composite risk score of 58/100, placing it in the suspicious verdict band. SHA256: e1980c6592e6d2d92c1a65acad8f1071b6a404097bb6fcce494f3c8ac31385cf.

What is winio64.sys?

winio64.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Symantec Time Stamping Services CA - G2.