Analysis of gdrv.sys: malicious verdict, risk score 88/100. 4 YARA matches, 1/75 multi-engine detections. SHA256 ff6729518a380bf5. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver gdrv.sys and assigned a verdict of Malicious with a composite risk score of 88/100, indicating malicious indicators (80-100 band).
| Verdict | Malicious (88/100) |
| YARA matches | 4 |
| Multi-engine detections | 1 / 75 |
| File size | 26792 bytes |
| Code-signing signer | Symantec Time Stamping Services CA - G2 |
| Analyzed | 2026-09-06 |
| SHA256 | ff6729518a380bf57f1bc6f1ec0aa7f3012e1618b8d9b0f31a61d299ee2b4339 |
| SHA1 | 8d59fd14a445c8f3f0f7991fa6cd717d466b3754 |
| MD5 | 1cff7b947f8c3dea1d34dc791fc78cdc |
Version resource data embedded in the gdrv.sys PE header, as extracted by the analysis engine.
| File description | GIGA-BYTE NonPNP Driver |
|---|---|
| Product | gdrv64 |
| Company | GIGA-BYTE TECHNOLOGY CO., LTD. |
| Original filename | gdrv.sys |
| Internal name | gdrv.sys |
| File version | 1.0.0.1 |
| Copyright | Copyright (C) 2017 |
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 | 100 / 100 |
| Known-vulnerable corpus | 100 / 100 |
| Code-signing state | 80 / 100 |
| Packing and entropy | 0 / 100 |
| Dynamic behaviour | 0 / 100 |
| CVE cross-reference | 40 / 100 |
Kernel-mode APIs resolved from the Import Address Table of gdrv.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapIoSpace | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmMapLockedPages | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| 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 |
| MmUnmapIoSpace | medium | Moderate risk - system modification capability |
| KeBugCheckEx | medium | Moderate risk - system modification capability |
| ObReferenceObjectByHandle | medium | Moderate risk - system modification capability |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| ZwClose | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| DbgPrint | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| ExAllocatePool | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| IoDeleteDevice | 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 |
|---|---|---|---|
| 0xC3502808 | critical (known exploit) | METHOD_BUFFERED | Arbitrary memory R/W (RTCore64) |
| 0xC350280C | critical (known exploit) | METHOD_BUFFERED | Physical memory map (RTCore64) |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0xC350BAC1 | medium | METHOD_IN_DIRECT | CUSTOM_MSI Function #3760 |
| 0x00808B89 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #738 |
| 0xC3500E50 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #916 |
| 0xC3500E60 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #920 |
| 0xC3502000 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #2048 |
| 0xC3506400 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #2304 |
| 0x0022E715 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #2501 |
| 0xC3506404 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #2305 |
| 0xC350A444 | medium | METHOD_BUFFERED | CUSTOM_MSI Function #2321 |
| 0x0080BAC1 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3760 |
| 0x003402E8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #186 |
| 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 | 0x2A8F | 0x2C00 | 6.35 | CODE, EXEC, READ |
| .rdata | 0x06A0 | 0x0800 | 3.65 | IDATA, READ |
| .data | 0x0054 | 0x0200 | 0.28 | IDATA, READ, WRITE |
| .pdata | 0x01EC | 0x0200 | 3.82 | IDATA, READ |
| .gfids | 0x0004 | 0x0200 | 0.02 | IDATA, READ |
| INIT | 0x044C | 0x0600 | 4.15 | CODE, EXEC, READ, DISCARD |
| .rsrc | 0x0348 | 0x0400 | 2.83 | IDATA, READ, DISCARD |
| .reloc | 0x0018 | 0x0200 | 0.28 | IDATA, READ, DISCARD |
| Control Flow Guard | Not enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 55 / 100 |
| Rule | Severity | Detects |
|---|---|---|
| PUA_VULN_Driver_Gigabytetechnologycoltd_Gdrvsys_Gdrv_FF67 | medium | Detects vulnerable driver mentioned in known-vulnerable driver corpus project using VersionInfo values from the PE header - gdrv.sys. Investigate matches in context: expected filenames or standard ven... |
| VULN_RTCore64 | critical | MSI RTCore64.sys |
| BYOVD_MemRW | critical | Phys memory mapping + device creation |
| SUSP_PhysMem | high | Physical memory mapping |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1003 | OS Credential Dumping | Credential Access |
| T1003.001 | OS Credential Dumping: LSASS Memory | Credential Access |
| T1006 | Direct Volume Access | Defense Evasion |
| T1055.012 | Process Hollowing | Defense Evasion |
| T1068 | Exploitation for Privilege Escalation | Privilege Escalation |
| T1071 | Application Layer Protocol | Command and Control |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1543.003 | Windows Service | Persistence |
| T1553.002 | Subvert Trust Controls: Code Signing | Defense Evasion |
| T1562.001 | Impair Defenses | Defense Evasion |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | Symantec Time Stamping Services CA - G2 |
|---|---|
| Signer organisation | Symantec Corporation |
| Issuer | Thawte Timestamping CA |
| Serial | 7E93EBFB7CC64E59EA4B9A77D406FC3B |
| Valid from | 2012-12-21 00:00 UTC |
| Valid until | 2020-12-30 23:59 UTC (expired) |
| Signature validity | Not verified |
Engine angr, status completed, 31 paths explored at a maximum depth of 31. Vulnerability classes reached: 1. 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, gdrv.sys is flagged as malicious and should be treated as dangerous. Its composite risk score is 88/100 (verdict: malicious). Always validate findings independently before acting.
gdrv.sys has a DriverShield composite risk score of 88/100, placing it in the malicious verdict band. SHA256: ff6729518a380bf57f1bc6f1ec0aa7f3012e1618b8d9b0f31a61d299ee2b4339.
gdrv.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Symantec Time Stamping Services CA - G2.
Related: Other drivers signed by Symantec Time Stamping Services CA - G2 · CVE-2018-19320 · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas