Analysis of AsusBiosIoDrv64.sys: clean verdict, risk score 18/100. 0 YARA matches, 1/74 multi-engine detections. SHA256 e5e0734890c8514e. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver AsusBiosIoDrv64.sys and assigned a verdict of Clean with a composite risk score of 18/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (18/100) |
| YARA matches | 0 |
| Multi-engine detections | 1 / 74 |
| File size | 26376 bytes |
| Code-signing signer | DigiCert Timestamp 2021 |
| Analyzed | 2026-03-23 |
| SHA256 | e5e0734890c8514e4addcc9d8c5568463e9f156d57492875eddfd840a909c5f2 |
| SHA1 | 004c0e15963f96e4710962e6efeabcad9a0ccb87 |
| MD5 | 50d296acb120304020a3c498b884edcf |
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 | 3 / 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 AsusBiosIoDrv64.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| ZwMapViewOfSection | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmGetPhysicalAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| MmAllocateContiguousMemory | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| IoDeleteDevice | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | 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 |
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 | 0x0EFE | 0x1000 | 5.89 | CODE, EXEC, READ |
| .rdata | 0x059C | 0x0600 | 3.72 | IDATA, READ |
| .data | 0x0F28 | 0x0200 | 0.61 | IDATA, READ, WRITE |
| .pdata | 0x00D8 | 0x0200 | 1.76 | IDATA, READ |
| INIT | 0x0386 | 0x0400 | 4.6 | CODE, EXEC, READ, DISCARD |
| .reloc | 0x0024 | 0x0200 | 0.4 | 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 |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1071 | Application Layer Protocol | Command and Control |
| T1543.003 | Windows Service | Persistence |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | DigiCert Timestamp 2021 |
|---|---|
| Signer organisation | DigiCert, Inc. |
| Issuer | DigiCert SHA2 Assured ID Timestamping CA |
| Serial | D424AE0BE3A88FF604021CE1400F0DD |
| Valid from | 2021-01-01 00:00 UTC |
| Valid until | 2031-01-06 00:00 UTC |
| Signature validity | Verified |
Engine angr, status completed, 43 paths explored at a maximum depth of 43. Vulnerability classes reached: 1. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, AsusBiosIoDrv64.sys is assessed as clean, with no notable risk signals. Its composite risk score is 18/100 (verdict: clean). Always validate findings independently before acting.
AsusBiosIoDrv64.sys has a DriverShield composite risk score of 18/100, placing it in the clean verdict band. SHA256: e5e0734890c8514e4addcc9d8c5568463e9f156d57492875eddfd840a909c5f2.
AsusBiosIoDrv64.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by DigiCert Timestamp 2021.
Related: Other drivers signed by DigiCert Timestamp 2021 · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas