Analysis of PhlashNT_64.sys: vulnerable verdict, risk score 72/100. 3 YARA matches, 0/74 multi-engine detections. SHA256 65db1b259e305a52. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver PhlashNT_64.sys and assigned a verdict of Vulnerable with a composite risk score of 72/100, indicating a known or likely vulnerability surface (60-79 band).
| Verdict | Vulnerable (72/100) |
| YARA matches | 3 |
| Multi-engine detections | 0 / 74 |
| File size | 61496 bytes |
| Code-signing signer | VeriSign Time Stamping Services Signer - G2 |
| Analyzed | 2026-09-06 |
| SHA256 | 65db1b259e305a52042e07e111f4fa4af16542c8bacd33655f753ef642228890 |
| SHA1 | c6d349823bbb1f5b44bae91357895dba653c5861 |
| MD5 | e9e786bdba458b8b4f9e93d034f73d00 |
Version resource data embedded in the PhlashNT_64.sys PE header, as extracted by the analysis engine.
| File description | SWinFlash Driver for Windows NT |
|---|---|
| Product | WinPhlash |
| Company | Phoenix Technologies, Ltd. |
| Original filename | PHLASHNT.SYS |
| Internal name | PHLASHNT |
| File version | 1.6.1.0 |
| Copyright | (c) Phoenix Technologies, Ltd. 2000-2003 |
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 | 85 / 100 |
| Dangerous kernel imports | 100 / 100 |
| IOCTL dispatch surface | 48 / 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 PhlashNT_64.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPages | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmMapIoSpace | critical | Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination |
| MmUnmapIoSpace | medium | Moderate risk - system modification capability |
| DbgPrint | low | Standard kernel API - generally benign |
| IoCreateDevice | low | Standard kernel API - generally benign |
| IoCreateSymbolicLink | low | Standard kernel API - generally benign |
| IoDeleteSymbolicLink | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| IoDeleteDevice | 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 |
|---|---|---|---|
| 0x008090FF | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #1087 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x0080BA66 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #3737 |
| 0x00802484 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2337 |
| 0x00808889 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #546 |
| 0x0080248C | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2339 |
| 0x00342444 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #2321 |
| 0x008024BC | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2351 |
| 0x0080C181 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #96 |
| 0x00800038 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #14 |
| 0x00802494 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2341 |
| 0x00346F0D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #3011 |
| 0x0034930D | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #1219 |
| 0x00802528 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #2378 |
| 0x0080B841 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3600 |
| 0x00340306 | medium | METHOD_OUT_DIRECT | 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 | 0xB617 | 0xB800 | 5.62 | CODE, EXEC, READ |
| .rdata | 0x0478 | 0x0600 | 3.16 | IDATA, READ |
| .data | 0x08CC | 0x0400 | 1.48 | IDATA, READ, WRITE |
| .pdata | 0x0534 | 0x0600 | 3.86 | IDATA, READ |
| INIT | 0x0212 | 0x0400 | 2.98 | CODE, EXEC, READ, WRITE, DISCARD |
| .rsrc | 0x0368 | 0x0400 | 2.92 | IDATA, READ, DISCARD |
| .reloc | 0x00DC | 0x0200 | 0.85 | 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 |
|---|---|---|
| PUA_VULN_Driver_Phoenixtechnologiesltd_Phlashnt_Winphlash_65DB | medium | Detects vulnerable driver mentioned in known-vulnerable driver corpus project using VersionInfo values from the PE header - PhlashNT.sys. Investigate matches in context: expected filenames or standard... |
| 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 | 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 completed, 18 paths explored at a maximum depth of 18. 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, PhlashNT_64.sys is flagged as vulnerable and is a potential Bring Your Own Vulnerable Driver (BYOVD) risk. Its composite risk score is 72/100 (verdict: vulnerable). Always validate findings independently before acting.
PhlashNT_64.sys has a DriverShield composite risk score of 72/100, placing it in the vulnerable verdict band. SHA256: 65db1b259e305a52042e07e111f4fa4af16542c8bacd33655f753ef642228890.
PhlashNT_64.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