Analysis of s.sys: vulnerable verdict, risk score 60/100. 0 YARA matches. SHA256 d9f203d2e0cdefab. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver s.sys and assigned a verdict of Vulnerable with a composite risk score of 60/100, indicating a known or likely vulnerability surface (60-79 band).
| Verdict | Vulnerable (60/100) |
| YARA matches | 0 |
| File size | 23080 bytes |
| Code-signing signer | Hangzhou HollySys Automation Co., Ltd |
| Analyzed | 2026-10-05 |
| SHA256 | d9f203d2e0cdefab407bcbaed424e9690d9b05c3eb80a71a69b1f8c6fd895944 |
| SHA1 | d9c4553224bb71b9bb1f30b9d82d5da5ad82afc6 |
| MD5 | d2533f77ded92d8eb830c682418f1a08 |
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 | 21 / 100 |
| Known-vulnerable corpus | 0 / 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 s.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmMapLockedPagesSpecifyCache | 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 |
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| ZwOpenProcess | 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 |
| MmGetPhysicalAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| IoGetDeviceObjectPointer | medium | Moderate risk - system modification capability |
| ZwQuerySystemInformation | medium | Moderate risk - system modification capability |
| RtlInitAnsiString | low | Standard kernel API - generally benign |
| RtlInitUnicodeString | low | Standard kernel API - generally benign |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| ExAllocatePool | 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 |
|---|---|---|---|
| 0x00343123 | high | METHOD_NEITHER | FILE_DEVICE_DISK Function #3144 |
| 0x00343323 | high | METHOD_NEITHER | FILE_DEVICE_DISK Function #3272 |
| 0x00343523 | high | METHOD_NEITHER | FILE_DEVICE_DISK Function #3400 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00342811 | medium | METHOD_IN_DIRECT | FILE_DEVICE_DISK Function #2564 |
| 0x00802811 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2564 |
| 0x002245E9 | medium | METHOD_IN_DIRECT | FILE_DEVICE_UNKNOWN Function #378 |
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 | 0x0FCA | 0x1000 | 6.27 | CODE, EXEC, READ |
| .rdata | 0x033C | 0x0400 | 3.63 | IDATA, READ |
| .data | 0x27B8 | 0x2800 | 3.84 | IDATA, READ, WRITE |
| .pdata | 0x0108 | 0x0200 | 2.2 | IDATA, READ |
| INIT | 0x02EA | 0x0400 | 3.81 | IDATA, READ, WRITE, DISCARD |
| Control Flow Guard | Not enabled |
|---|---|
| ASLR | Enabled |
| DEP | Enabled |
| Integrity check | Not enforced |
| Mitigation score | 55 / 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 |
| T1211 | Exploitation for Defense Evasion | Defense Evasion |
| T1489 | Service Stop | Impact |
| T1543.003 | Windows Service | 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 | Hangzhou HollySys Automation Co., Ltd |
|---|---|
| Signer organisation | Hangzhou HollySys Automation Co., Ltd |
| Issuer | VeriSign Class 3 Code Signing 2010 CA |
| Serial | 72A5990618823715C3F8A40FE42FB732 |
| Valid from | 2012-06-11 00:00 UTC |
| Valid until | 2013-06-11 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.
Based on DriverShield static and dynamic analysis, s.sys is flagged as vulnerable and is a potential Bring Your Own Vulnerable Driver (BYOVD) risk. Its composite risk score is 60/100 (verdict: vulnerable). Always validate findings independently before acting.
s.sys has a DriverShield composite risk score of 60/100, placing it in the vulnerable verdict band. SHA256: d9f203d2e0cdefab407bcbaed424e9690d9b05c3eb80a71a69b1f8c6fd895944.
s.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Hangzhou HollySys Automation Co., Ltd.
Related: Other drivers signed by Hangzhou HollySys Automation Co., Ltd · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas