Analysis of fs_rec.sys: clean verdict, risk score 14/100. 0 YARA matches. SHA256 2073327e5c1e542e. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver fs_rec.sys and assigned a verdict of Clean with a composite risk score of 14/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (14/100) |
| YARA matches | 0 |
| File size | 33592 bytes |
| Code-signing signer | Microsoft Windows |
| Analyzed | 2026-03-22 |
| SHA256 | 2073327e5c1e542ea2740ca0d43204940eb72652619b5209a2e4a4a0fb18d20a |
| SHA1 | d686d1d99931eda9bdcbef106b4c2e9e2a1a9933 |
| MD5 | a3631addd926826110a436d6a04b31ca |
Version resource data embedded in the fs_rec.sys PE header, as extracted by the analysis engine.
| File description | File System Recognizer Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | fs_rec.sys |
| Internal name | fs_rec.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 | 36 / 100 |
| IOCTL dispatch surface | 24 / 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-mode APIs resolved from the Import Address Table of fs_rec.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| KeSetEvent | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IoBuildDeviceIoControlRequest | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| ZwCreateFile | 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 |
| 0x0034C408 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #258 |
| 0x0034C400 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #256 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x008000BA | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #46 |
| 0x00227980 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3680 |
| 0x00808B00 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #704 |
| 0x00340398 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #230 |
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 | 0x05AC | 0x0600 | 5.52 | CODE, EXEC, READ |
| .rdata | 0x0EC8 | 0x1000 | 3.97 | IDATA, READ |
| .data | 0x0149 | 0x0200 | 1.09 | IDATA, READ, WRITE |
| .pdata | 0x02B8 | 0x0400 | 3.09 | IDATA, READ |
| .idata | 0x031E | 0x0400 | 3.52 | IDATA, READ |
| PAGE | 0x2A9F | 0x2C00 | 6.16 | CODE, EXEC, READ |
| INIT | 0x0536 | 0x0600 | 5.3 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0020 | 0x0200 | 0.3 | IDATA, READ, DISCARD |
| .rsrc | 0x0408 | 0x0600 | 2.43 | IDATA, READ, DISCARD |
| .reloc | 0x0298 | 0x0400 | 3.39 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 85 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1071 | Application Layer Protocol | Command and Control |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1543.003 | Windows Service | Persistence |
| T1547.001 | Registry Run Keys | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | Defense Evasion |
| T1569.002 | System Services: Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Production PCA 2011 |
| Serial | 330000023241FB59996DCC4DFF000000000232 |
| Valid from | 2019-05-02 21:24 UTC |
| Valid until | 2020-05-02 21:24 UTC (expired) |
| Signature validity | Not verified |
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, fs_rec.sys is assessed as clean, with no notable risk signals. Its composite risk score is 14/100 (verdict: clean). Always validate findings independently before acting.
fs_rec.sys has a DriverShield composite risk score of 14/100, placing it in the clean verdict band. SHA256: 2073327e5c1e542ea2740ca0d43204940eb72652619b5209a2e4a4a0fb18d20a.
fs_rec.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Microsoft Windows.
Related: Other drivers signed by Microsoft Windows · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas