Analysis of cht4vfx.sys: clean verdict, risk score 10/100. 0 YARA matches. SHA256 289f18d3fa652d1b. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver cht4vfx.sys and assigned a verdict of Clean with a composite risk score of 10/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (10/100) |
| YARA matches | 0 |
| File size | 28672 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 289f18d3fa652d1b60c8799ea38ed3caf04416aa62817a9a49028141ba1adfb9 |
| SHA1 | ca1c83774c90e747468db221590b26a38d9b0926 |
| MD5 | fa4093352e74ef06b8b261bf91328e8d |
Version resource data embedded in the cht4vfx.sys PE header, as extracted by the analysis engine.
| File description | VF library for Chelsio ® T5/T6 Chipset |
|---|---|
| Product | Chelsio Communications Unified Network I/O Controller |
| Company | Chelsio Communications |
| Original filename | cht4vfx.sys |
| Internal name | cht4vfx.sys |
| File version | 6.11.4.100 |
| Copyright | Copyright © 2016 Chelsio Communications. All rights reserved. |
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 | 39 / 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-mode APIs resolved from the Import Address Table of cht4vfx.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
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 |
|---|---|---|---|
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x00228320 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #200 |
| 0x9C40B806 | medium | METHOD_OUT_DIRECT | CUSTOM_LENOVO Function #3585 |
| 0x008000B9 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #46 |
| 0x00802502 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #2368 |
| 0x0034AF05 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3009 |
| 0x00342444 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #2321 |
| 0x0080C481 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #288 |
| 0x00225002 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #1024 |
| 0x003403C8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #242 |
| 0x0034002E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #11 |
| 0x00340074 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #29 |
| 0x00340038 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #14 |
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 | 0x4BEA | 0x4C00 | 6.36 | CODE, EXEC, READ |
| .rdata | 0x08A4 | 0x0A00 | 3.91 | IDATA, READ |
| .data | 0x00B8 | 0x0200 | 1.17 | IDATA, READ, WRITE |
| .pdata | 0x02E8 | 0x0400 | 3.3 | IDATA, READ |
| .edata | 0x05BD | 0x0600 | 5.03 | IDATA, READ |
| INIT | 0x0184 | 0x0200 | 4.07 | CODE, EXEC, READ, DISCARD |
| .rsrc | 0x04F0 | 0x0600 | 2.88 | IDATA, READ, DISCARD |
| .reloc | 0x003C | 0x0200 | 0.78 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 80 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1071 | Application Layer Protocol | Command and Control |
| 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 |
Engine angr, status no_findings, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, cht4vfx.sys is assessed as clean, with no notable risk signals. Its composite risk score is 10/100 (verdict: clean). Always validate findings independently before acting.
cht4vfx.sys has a DriverShield composite risk score of 10/100, placing it in the clean verdict band. SHA256: 289f18d3fa652d1b60c8799ea38ed3caf04416aa62817a9a49028141ba1adfb9.
cht4vfx.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.
Related: What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas