Analysis of YSR0.sys: clean verdict, risk score 17/100. 0 YARA matches, 0/75 multi-engine detections. SHA256 5c8893028da500a2. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver YSR0.sys and assigned a verdict of Clean with a composite risk score of 17/100, indicating no notable risk signals (0-29 band).
| Verdict | Clean (17/100) |
| YARA matches | 0 |
| Multi-engine detections | 0 / 75 |
| File size | 1268360 bytes |
| Code-signing signer | Symantec Time Stamping Services CA - G2 |
| Analyzed | 2026-03-22 |
| SHA256 | 5c8893028da500a21082afa61c4cbe893417db322762ee1ace8d02169e1c9ea9 |
| SHA1 | 402a3d19bdd0beb55be6b254e14c646ff6af3d5d |
| MD5 | e99b49570c2178cd0f3ca91323677153 |
Version resource data embedded in the YSR0.sys PE header, as extracted by the analysis engine.
| File description | VirtualBox VMM - ring-0 context parts |
|---|---|
| Product | Nox Limited VM VirtualBox |
| Company | Nox Limited Corporation |
| Original filename | YSR0.sys |
| Internal name | YSR0 |
| File version | 5.2.36.135684 |
| Copyright | Copyright (C) 2015-2020 Nox Limited |
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 | 0 / 100 |
| IOCTL dispatch surface | 100 / 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 |
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 |
|---|---|---|---|
| 0x00800C4B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #786 |
| 0x00808DB7 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #877 |
| 0x0080A903 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #2624 |
| 0x008080B7 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #45 |
| 0x0080808B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #34 |
| 0x008083B7 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #237 |
| 0x0080850F | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #323 |
| 0x0080840F | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #259 |
| 0x008086FF | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #447 |
| 0x00803D07 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3905 |
| 0x0080FA83 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3744 |
| 0x0080FC8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3874 |
| 0x0080D893 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #1572 |
| 0x0080C4BF | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #303 |
| 0x0080D493 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #1316 |
| 0x0080F983 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3680 |
| 0x0080FC83 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3872 |
| 0x0080F98B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3682 |
| 0x0080D483 | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #1312 |
| 0x0080F8BB | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #3630 |
| 0x00808A7F | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #671 |
| 0x00808A6F | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #667 |
| 0x00808F8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #994 |
| 0x0080838B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #226 |
Showing 24 of 40 extracted control codes.
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 | 0xD204B | 0xD2200 | 6.43 | CODE, EXEC, READ |
| .rdata | 0x3901C | 0x39200 | 4.1 | IDATA, READ |
| .data | 0x3330 | 0x0200 | 0.8 | IDATA, READ, WRITE |
| .pdata | 0xB3E8 | 0xB400 | 5.98 | IDATA, READ |
| VTGObj | 0x2D60 | 0x2E00 | 3.99 | IDATA, READ, WRITE |
| .edata | 0x9542 | 0x9600 | 6.15 | IDATA, READ |
| INIT | 0x111A | 0x1200 | 4.95 | CODE, EXEC, READ, WRITE, DISCARD |
| .rsrc | 0x03F8 | 0x0400 | 3.42 | IDATA, READ, DISCARD |
| .reloc | 0x4CB6 | 0x4E00 | 5.21 | IDATA, READ, DISCARD |
| Control Flow Guard | Not enabled |
|---|---|
| ASLR | Not enabled |
| DEP | Not enabled |
| Integrity check | Enforced |
| Mitigation score | 10 / 100 |
Techniques this driver could enable if loaded by an adversary.
| ID | Technique | Tactic |
|---|---|---|
| T1071 | Application Layer Protocol | Command and Control |
| T1543.003 | Windows Service | Persistence |
| 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, 2 paths explored at a maximum depth of 2. Vulnerability classes reached: 0. Exploitable paths: 0.
Based on DriverShield static and dynamic analysis, YSR0.sys is assessed as clean, with no notable risk signals. Its composite risk score is 17/100 (verdict: clean). Always validate findings independently before acting.
YSR0.sys has a DriverShield composite risk score of 17/100, placing it in the clean verdict band. SHA256: 5c8893028da500a21082afa61c4cbe893417db322762ee1ace8d02169e1c9ea9.
YSR0.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 · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas