f9dd0b57a5c133ca0c4cab3cca1ac8... - Suspicious (58/100) - DriverShield Analysis

Analysis of f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys: suspicious verdict, risk score 58/100. 1 YARA match, 46/74 multi-engine detections. SHA256 f9dd0b57a5c133ca. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys - Analysis Report

DriverShield analyzed the Windows kernel driver f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.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	1
Multi-engine detections	46 / 74
File size	456896 bytes
Code-signing signer	Anneng electronic Co. Ltd.
Analyzed	2026-05-09
SHA256	f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af00c1
SHA1	1c85aa9f61d92cfb9107b8ec5303ed60990509b1
MD5	2965ddbcd11a08a3ca159af187ef754c

Driver identity

Version resource data embedded in the f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys PE header, as extracted by the analysis engine.

File description	Winkbj Kernel Driver
Product	Windows (R) Win 7 DDK driver
Company	Windows (R) Win 7 DDK provider
Original filename	Winkbj.sys
Internal name	Winkbj.sys
File version	10.0.10011.16384
Copyright	© Microsoft Corporation. All rights reserved.

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	5 / 100
Dangerous kernel imports	100 / 100
IOCTL dispatch surface	100 / 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

Kernel imports (25)

Kernel-mode APIs resolved from the Import Address Table of f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys, ranked by exploitation relevance.

API	Risk	Why it matters
ObRegisterCallbacks	high	Potentially dangerous - could be used for privilege escalation or security bypass
PsSetCreateProcessNotifyRoutineEx	high	Potentially dangerous - could be used for privilege escalation or security bypass
ZwOpenProcess	high	Potentially dangerous - could be used for privilege escalation or security bypass
PsLookupProcessByProcessId	high	Potentially dangerous - could be used for privilege escalation or security bypass
ZwQuerySystemInformation	medium	Moderate risk - system modification capability
CmRegisterCallbackEx	medium	Moderate risk - system modification capability
ZwSetValueKey	medium	Moderate risk - system modification capability
KeBugCheckEx	medium	Moderate risk - system modification capability
PsSetLoadImageNotifyRoutine	medium	Moderate risk - system modification capability
ObOpenObjectByPointer	medium	Moderate risk - system modification capability
IoDeleteSymbolicLink	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
ZwOpenKey	low	Standard kernel API - generally benign
DbgPrintEx	low	Standard kernel API - generally benign
IofCompleteRequest	low	Standard kernel API - generally benign
ZwQueryValueKey	low	Standard kernel API - generally benign
IoCreateDevice	low	Standard kernel API - generally benign
RtlInitAnsiString	low	Standard kernel API - generally benign
DbgPrint	low	Standard kernel API - generally benign
ZwClose	low	Standard kernel API - generally benign
IoCreateSymbolicLink	low	Standard kernel API - generally benign
ExAllocatePool	low	Standard kernel API - generally benign
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
IoDeleteDevice	low	Standard kernel API - generally benign

IOCTL dispatch codes (40)

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
0x00222000	medium (known exploit)	METHOD_BUFFERED	Driver communication init
0x0080840F	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #259
0x0080A383	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #2272
0x00347473	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #3356
0x00347263	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #3224
0x002200F0	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #60
0x00801E84	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #1953
0x0022FBE8	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #3834
0x0022B800	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #3584
0x0080EC81	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #2848
0x008024AC	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2347
0x003461E8	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #2170
0x0080C315	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #197
0x00808B15	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #709
0x00802484	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2337
0x008024A4	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2345
0x00220400	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #256
0x00220800	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #512
0x00220C00	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #768
0x00341000	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #1024
0x00801000	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #1024
0x00340900	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #576
0x00348B00	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #704
0x00341200	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #1152

Showing 24 of 40 extracted control codes.

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	0x14AF6	0x14C00	6.53	CODE, EXEC, READ
.rdata	0x556A8	0x55800	4.63	IDATA, READ
.data	0x1230	0x0C00	3.36	IDATA, READ, WRITE
.pdata	0x0A08	0x0C00	4.37	IDATA, READ
INIT	0x0B22	0x0C00	5.13	CODE, EXEC, READ, DISCARD
.rsrc	0x0458	0x0600	2.79	IDATA, READ, DISCARD
.reloc	0x141C	0x1600	6.5	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Enforced
Mitigation score	90 / 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.
• Force Integrity - IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY is set - the OS validates the signature before loading.

YARA rule matches (1)

Rule	Severity	Detects
SUSP_Callbacks	medium	Kernel callback registration

MITRE ATT&CK techniques (15)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1014	Rootkit	Defense Evasion
T1055.001	Process Injection: DLL Injection	Defense Evasion
T1068	Exploitation for Privilege Escalation	Privilege Escalation
T1071	Application Layer Protocol	Command and Control
T1112	Modify Registry	Defense Evasion
T1211	Exploitation for Defense Evasion	Defense Evasion
T1489	Service Stop	Impact
T1543.003	Windows Service	Persistence
T1547.001	Registry Run Keys	Persistence
T1553.002	Subvert Trust Controls: Code Signing	Defense Evasion
T1562.001	Impair Defenses: Disable/Modify Tools	Defense Evasion
T1562.006	Indicator Blocking	Defense Evasion
T1564.001	Hidden Files and Directories	Defense Evasion
T1569.002	Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Code-signing chain

Signer	Anneng electronic Co. Ltd.
Signer organisation	Anneng electronic Co. Ltd.
Issuer	Thawte Code Signing CA - G2
Serial	2602BB9BA2AE651AEAA79AEC38A3CB3D
Valid from	2013-05-06 00:00 UTC
Valid until	2014-05-06 23:59 UTC (expired)
Signature validity	Not verified

• Certificate revision: 0x0200
• Certificate type: PKCS#7
• Chain: Thawte Code Signing CA - G2
• Chain: thawte Primary Root CA

Symbolic execution

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

Frequently asked questions about f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys

Is f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys safe?

Based on DriverShield static and dynamic analysis, f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.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 f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys?

f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys has a DriverShield composite risk score of 58/100, placing it in the suspicious verdict band. SHA256: f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af00c1.

What is f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys?

f9dd0b57a5c133ca0c4cab3cca1ac8debdc4a798b452167a1e5af78653af.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Anneng electronic Co. Ltd..

Related: Other drivers signed by Anneng electronic Co. Ltd. · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas

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