Analysis of filecrypt.sys: clean verdict, risk score 26/100. 0 YARA matches. SHA256 cfffd7007ab7fb04. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver filecrypt.sys and assigned a verdict of Clean with a composite risk score of 26/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (26/100) |
| YARA matches | 0 |
| File size | 59392 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | cfffd7007ab7fb04ecb44d0079bfe8eeb53aecc988135199c388af425ebcf2ad |
| SHA1 | 472fba0ddc84c144082afb0c520b801f2091574f |
| MD5 | 8e59d944ee4efaed65a341a71297c4cd |
Version resource data embedded in the filecrypt.sys PE header, as extracted by the analysis engine.
| File description | Windows sandboxing and encryption filter |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | filecrypt.sys |
| Internal name | filecrypt.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 | 78 / 100 |
| IOCTL dispatch surface | 75 / 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 filecrypt.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPagesSpecifyCache | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ZwSetValueKey | medium | Moderate risk - system modification capability |
| ZwClose | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| ZwOpenKey | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| SeAccessCheck | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| ZwQueryValueKey | 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 |
|---|---|---|---|
| 0x00340033 | high | METHOD_NEITHER | FILE_DEVICE_DISK Function #12 |
| 0x00808D8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #866 |
| 0x0080858B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #354 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0022EF15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3013 |
| 0x0034670D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #2499 |
| 0x0034002D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #11 |
| 0x00340035 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #13 |
| 0x00340030 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #12 |
| 0x00340031 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #12 |
| 0x0022011A | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #70 |
| 0x00220118 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #70 |
| 0x0034F981 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3680 |
| 0x00343D19 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3910 |
| 0x00347D80 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3936 |
| 0x0022BA41 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3728 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x0022E045 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #2065 |
| 0x0034BF05 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #4033 |
| 0x0080BE40 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #3984 |
| 0x00804024 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #9 |
| 0x0034BB0A | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #3778 |
| 0x00343DD8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3958 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
Showing 24 of 25 extracted control codes.
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 | 0x2A81 | 0x2C00 | 6.17 | CODE, EXEC, READ |
| .rdata | 0x1D70 | 0x1E00 | 4.45 | IDATA, READ |
| .data | 0x068C | 0x0200 | 1.24 | IDATA, READ, WRITE |
| .pdata | 0x0600 | 0x0600 | 4.56 | IDATA, READ |
| .idata | 0x129E | 0x1400 | 4.43 | IDATA, READ |
| PAGE | 0x622D | 0x6400 | 6.12 | CODE, EXEC, READ |
| INIT | 0x06D0 | 0x0800 | 5.22 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0054 | 0x0200 | 0.77 | IDATA, READ, DISCARD |
| .rsrc | 0x0608 | 0x0800 | 2.64 | IDATA, READ, DISCARD |
| .reloc | 0x07A0 | 0x0800 | 5.61 | 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 |
| 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 |
| 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, filecrypt.sys is assessed as clean, with no notable risk signals. Its composite risk score is 26/100 (verdict: clean). Always validate findings independently before acting.
filecrypt.sys has a DriverShield composite risk score of 26/100, placing it in the clean verdict band. SHA256: cfffd7007ab7fb04ecb44d0079bfe8eeb53aecc988135199c388af425ebcf2ad.
filecrypt.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