Analysis of OemHwUpd.sys: vulnerable verdict, risk score 78/100. 2 YARA matches, 15/76 multi-engine detections. SHA256 3111f4d7d4fac551. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver OemHwUpd.sys and assigned a verdict of Vulnerable with a composite risk score of 78/100, indicating a known or likely vulnerability surface (60-79 band).
| Verdict | Vulnerable (78/100) |
| YARA matches | 2 |
| Multi-engine detections | 15 / 76 |
| File size | 66112 bytes |
| Code-signing signer | VeriSign Time Stamping Services Signer - G2 |
| Analyzed | 2026-03-24 |
| SHA256 | 3111f4d7d4fac55103453c4c8adb742def007b96b7c8ed265347df97137fbee0 |
| SHA1 | d39a79ccfa41ec4a2c4cb9073721e299eee778ad |
| MD5 | 6aa2ed7241d3f00d75baf68572e0ed7b |
Version resource data embedded in the OemHwUpd.sys PE header, as extracted by the analysis engine.
| File description | EnCase Driver |
|---|---|
| Product | EnCase Driver |
| Company | Guidance Software Inc. |
| Original filename | EnPortv.sys |
| Internal name | EnPortv.sys |
| Copyright | Copyright (C) Guidance Software, Inc.2005-2006 |
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 | 100 / 100 |
| Dangerous kernel imports | 100 / 100 |
| IOCTL dispatch surface | 45 / 100 |
| Known-vulnerable corpus | 100 / 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 OemHwUpd.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ZwMapViewOfSection | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| ZwTerminateProcess | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| ZwOpenProcess | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| PsLookupProcessByProcessId | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| KeAttachProcess | 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 |
| ZwSetInformationFile | medium | Moderate risk - system modification capability |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| ZwDeleteKey | medium | Moderate risk - system modification capability |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| ZwQueryValueKey | low | Standard kernel API - generally benign |
| ProbeForRead | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| ZwQueryInformationFile | low | Standard kernel API - generally benign |
| KeInitializeEvent | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| DbgPrint | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| KeWaitForSingleObject | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| ZwOpenKey | 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 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x0034FF81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #4064 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x0022B941 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3664 |
| 0x00223048 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3090 |
| 0x0022309C | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3111 |
| 0x00347F0D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #4035 |
| 0x00225DE8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #1914 |
| 0x00222DE8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2938 |
| 0x00802494 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2341 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x0080249C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2343 |
| 0x00223411 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #3332 |
| 0x00340304 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #193 |
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 | 0xC9DC | 0xCA00 | 6.31 | CODE, EXEC, READ |
| .rdata | 0x06BC | 0x0800 | 4.19 | IDATA, READ |
| .data | 0x05C0 | 0x0200 | 0.3 | IDATA, READ, WRITE |
| .pdata | 0x0270 | 0x0400 | 2.87 | IDATA, READ |
| INIT | 0x0660 | 0x0800 | 4.46 | CODE, EXEC, READ, WRITE, DISCARD |
| .rsrc | 0x0368 | 0x0400 | 2.88 | IDATA, READ, DISCARD |
| Control Flow Guard | Not enabled |
|---|---|
| ASLR | Not enabled |
| DEP | Not enabled |
| Integrity check | Not enforced |
| Mitigation score | 5 / 100 |
| Rule | Severity | Detects |
|---|---|---|
| BYOVD_ProcKill | critical | Process termination EDR killer |
| MAL_EDRKiller | critical | Generic EDR killer pattern |
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 | Disable/Modify Tools | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | VeriSign Time Stamping Services Signer - G2 |
|---|---|
| Signer organisation | VeriSign, Inc. |
| Issuer | VeriSign Time Stamping Services CA |
| Serial | 3825D7FAF861AF9EF490E726B5D65AD5 |
| Valid from | 2007-06-15 00:00 UTC |
| Valid until | 2012-06-14 23:59 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status static_approximation, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.
Corpus match: this hash is present in the known-vulnerable driver corpus DriverShield cross-references during analysis, which is why the score carries a full weighting on that component.
Based on DriverShield static and dynamic analysis, OemHwUpd.sys is flagged as vulnerable and is a potential Bring Your Own Vulnerable Driver (BYOVD) risk. Its composite risk score is 78/100 (verdict: vulnerable). Always validate findings independently before acting.
OemHwUpd.sys has a DriverShield composite risk score of 78/100, placing it in the vulnerable verdict band. SHA256: 3111f4d7d4fac55103453c4c8adb742def007b96b7c8ed265347df97137fbee0.
OemHwUpd.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by VeriSign Time Stamping Services Signer - G2.
Related: Other drivers signed by VeriSign Time Stamping Services Signer - G2 · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas