Analysis of flpydisk.sys: clean verdict, risk score 21/100. 0 YARA matches. SHA256 1534a840c56912d3. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver flpydisk.sys and assigned a verdict of Clean with a composite risk score of 21/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (21/100) |
| YARA matches | 0 |
| File size | 28672 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 1534a840c56912d34dec8f487683c0a782070a89726bf87dfaaf7f953a18a1da |
| SHA1 | 96557501b59171f3a251b12f426e62fb226e531d |
| MD5 | c867fe1865f45469dd96957900073361 |
Version resource data embedded in the flpydisk.sys PE header, as extracted by the analysis engine.
| File description | Floppy Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | floppy.sys |
| Internal name | floppy.sys |
| File version | 10.0.19041.1 (WinBuild.160101.0800) |
| Copyright | © Microsoft Corporation. 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 | 93 / 100 |
| IOCTL dispatch surface | 12 / 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 flpydisk.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPagesSpecifyCache | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| KeDelayExecutionThread | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | 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 |
|---|---|---|---|
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00222B0D | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #2755 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x00340378 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #222 |
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 | 0x10A9 | 0x1200 | 5.75 | CODE, EXEC, READ |
| .rdata | 0x0670 | 0x0800 | 3.99 | IDATA, READ |
| .data | 0x02C0 | 0x0400 | 2.6 | IDATA, READ, WRITE |
| .pdata | 0x021C | 0x0400 | 2.47 | IDATA, READ |
| .idata | 0x09B0 | 0x0A00 | 4.42 | IDATA, READ |
| PAGE | 0x33C7 | 0x3400 | 6.17 | CODE, EXEC, READ |
| INIT | 0x0182 | 0x0200 | 4.39 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x003C | 0x0200 | 0.56 | IDATA, READ, DISCARD |
| .rsrc | 0x03E8 | 0x0400 | 3.23 | IDATA, READ, DISCARD |
| .reloc | 0x03E8 | 0x0400 | 5.33 | 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 |
|---|---|---|
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| 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 |
| T1569.002 | Service Execution | Execution |
| 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, flpydisk.sys is assessed as clean, with no notable risk signals. Its composite risk score is 21/100 (verdict: clean). Always validate findings independently before acting.
flpydisk.sys has a DriverShield composite risk score of 21/100, placing it in the clean verdict band. SHA256: 1534a840c56912d34dec8f487683c0a782070a89726bf87dfaaf7f953a18a1da.
flpydisk.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