Analysis of scfilter.sys: clean verdict, risk score 13/100. 0 YARA matches. SHA256 4f51b7d83689fb26. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver scfilter.sys and assigned a verdict of Clean with a composite risk score of 13/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (13/100) |
| YARA matches | 0 |
| File size | 44032 bytes |
| Analyzed | 2026-03-22 |
| SHA256 | 4f51b7d83689fb2625473cf6b4f7744deeec622ed2968cfa26af0be0bb8a3dc2 |
| SHA1 | cf976f185fc010fb6df0fefb9affb14902fe151b |
| MD5 | e0d79317611a46d2db5101f902fe02b2 |
Version resource data embedded in the scfilter.sys PE header, as extracted by the analysis engine.
| File description | Microsoft Smart Card Reader Filter Driver |
|---|---|
| Product | Microsoft® Windows® Operating System |
| Company | Microsoft Corporation |
| Original filename | scfilter.sys |
| Internal name | scfilter |
| File version | 10.0.19041.4648 (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 | 30 / 100 |
| IOCTL dispatch surface | 36 / 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 scfilter.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| RtlInitAnsiString | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | 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 |
| 0x0022BA15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3717 |
| 0x008087C6 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #497 |
| 0x0080DF15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #1989 |
| 0x0080AB15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2757 |
| 0x0034002D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #11 |
| 0x00220118 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #70 |
| 0x0022011A | medium | METHOD_OUT_DIRECT | FILE_DEVICE_UNKNOWN Function #70 |
| 0x00808529 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #330 |
| 0x003403BC | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #239 |
| 0x0034002E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #11 |
| 0x00340036 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_DISK Function #13 |
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 | 0x63AA | 0x6400 | 6.31 | CODE, EXEC, READ |
| .rdata | 0x0BF8 | 0x0C00 | 4.94 | IDATA, READ |
| .data | 0x1320 | 0x0200 | 0.86 | IDATA, READ, WRITE |
| .pdata | 0x039C | 0x0400 | 3.9 | IDATA, READ |
| .idata | 0x02FA | 0x0400 | 3.32 | IDATA, READ |
| PAGE | 0x1A49 | 0x1C00 | 6 | CODE, EXEC, READ |
| INIT | 0x026C | 0x0400 | 4.3 | CODE, EXEC, READ, DISCARD |
| GFIDS | 0x0060 | 0x0200 | 0.89 | IDATA, READ, DISCARD |
| .rsrc | 0x0650 | 0x0800 | 2.76 | IDATA, READ, DISCARD |
| .reloc | 0x0270 | 0x0400 | 3.87 | 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 |
|---|---|---|
| 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, scfilter.sys is assessed as clean, with no notable risk signals. Its composite risk score is 13/100 (verdict: clean). Always validate findings independently before acting.
scfilter.sys has a DriverShield composite risk score of 13/100, placing it in the clean verdict band. SHA256: 4f51b7d83689fb2625473cf6b4f7744deeec622ed2968cfa26af0be0bb8a3dc2.
scfilter.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