Analysis of lagfilter.sys: clean verdict, risk score 24/100. 0 YARA matches, 0/76 multi-engine detections. SHA256 c59ce8bbf8989c48. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver lagfilter.sys and assigned a verdict of Clean with a composite risk score of 24/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (24/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 76 |
| File size | 105008 bytes |
| Code-signing signer | Microsoft Windows Hardware Compatibility Publisher |
| Analyzed | 2026-09-16 |
| SHA256 | c59ce8bbf8989c48698e9e9f005ca243478b2e82335e801ed5060137f1018d3a |
| SHA1 | 3d733e650c45a99b67ebd3992647b57904be8fcc |
| MD5 | a1b6804fdc2a0922d5ba8dcaec83547e |
Version resource data embedded in the lagfilter.sys PE header, as extracted by the analysis engine.
| File description | net_filter 7.0 |
|---|---|
| Product | net_filter_core |
| Company | net_filter |
| Original filename | net_filter.sys |
| Internal name | net_filter.sys |
| File version | 1.0.0.3 |
| Copyright | Copyright (C) 2026 |
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 | 100 / 100 |
| IOCTL dispatch surface | 45 / 100 |
| Known-vulnerable corpus | 0 / 100 |
| Code-signing state | 0 / 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 lagfilter.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPagesSpecifyCache | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| PsLookupProcessByProcessId | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ZwQuerySystemInformation | medium | Moderate risk - system modification capability |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| ObOpenObjectByPointer | medium | Moderate risk - system modification capability |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| DbgPrintEx | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| ZwOpenKey | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| KeSetEvent | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| 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 |
|---|---|---|---|
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x00808111 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #68 |
| 0x0080C481 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #288 |
| 0x008085C6 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #369 |
| 0x00808011 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #4 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
| 0x00347715 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3525 |
| 0x00220B15 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #709 |
| 0x00340069 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #26 |
| 0x00343415 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3333 |
| 0x003402D4 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #181 |
| 0x827335DD | medium | METHOD_IN_DIRECT | CUSTOM_VIRAGT Function #3447 |
| 0x987638EC | medium | METHOD_BUFFERED | CUSTOM_PROCESS Function #3643 |
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 | 0xFF4F | 0x10000 | 6.28 | CODE, EXEC, READ |
| .rdata | 0x16B0 | 0x1800 | 5 | IDATA, READ |
| .data | 0x1E18 | 0x0A00 | 2.1 | IDATA, READ, WRITE |
| .pdata | 0x09D8 | 0x0A00 | 4.86 | IDATA, READ |
| INIT | 0x09A0 | 0x0A00 | 5.01 | CODE, EXEC, READ, DISCARD |
| .rsrc | 0x0338 | 0x0400 | 2.66 | IDATA, READ, DISCARD |
| .reloc | 0x019C | 0x0200 | 4.63 | IDATA, READ, DISCARD |
| Control Flow Guard | Enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 100 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1055.001 | Process Injection: DLL Injection | Defense Evasion |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1071 | Application Layer Protocol | Command and Control |
| T1112 | Modify Registry | Defense Evasion |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1489 | Service Stop | Impact |
| T1543.003 | Windows Service | Persistence |
| T1547.001 | Registry Run Keys | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | Defense Evasion |
| T1562.001 | Impair Defenses: Disable/Modify Tools | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Microsoft Windows Hardware Compatibility Publisher |
|---|---|
| Signer organisation | Microsoft Corporation |
| Issuer | Microsoft Windows Third Party Component CA 2012 |
| Serial | 330000013C4A61FB3578D2B6DD00000000013C |
| Valid from | 2025-11-13 19:59 UTC |
| Valid until | 2026-11-10 19:59 UTC |
| Signature validity | Verified |
Engine angr, status static_approximation, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, lagfilter.sys is assessed as clean, with no notable risk signals. Its composite risk score is 24/100 (verdict: clean). Always validate findings independently before acting.
lagfilter.sys has a DriverShield composite risk score of 24/100, placing it in the clean verdict band. SHA256: c59ce8bbf8989c48698e9e9f005ca243478b2e82335e801ed5060137f1018d3a.
lagfilter.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 Hardware Compatibility Publisher.
Related: Other drivers signed by Microsoft Windows Hardware Compatibility Publisher · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas