Analysis of silabser.sys: clean verdict, risk score 18/100. 0 YARA matches, 0/76 multi-engine detections. SHA256 ca644642c189a216. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.
DriverShield analyzed the Windows kernel driver silabser.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 | 0 / 76 |
| File size | 156904 bytes |
| Code-signing signer | DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1 |
| Analyzed | 2026-05-01 |
| SHA256 | ca644642c189a216d67e4073f099a8768811d93a0257efd48dc3fc687a9390af |
| SHA1 | 006b0ab22ea64d88aaca673a6f61cf318e1aef46 |
| MD5 | 7704049b5600ce715de9faea36a6bd97 |
Version resource data embedded in the silabser.sys PE header, as extracted by the analysis engine.
| File description | Silicon Labs CP210x USB to UART Bridge Universal Driver (64-bit) |
|---|---|
| Product | Silicon Labs USBXpress Software |
| Company | Silicon Laboratories Inc. |
| Original filename | silabser.sys |
| Internal name | silabser |
| File version | 11.5.0.417 |
| Copyright | Copyright © 2019 Silicon Laboratories Inc., All Rights Reserved. |
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 | 30 / 100 |
| IOCTL dispatch surface | 100 / 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 silabser.sys, ranked by exploitation relevance.
| API | Risk | Why it matters |
|---|---|---|
| MmGetSystemRoutineAddress | high | Potentially dangerous - could be used for privilege escalation or security bypass |
| IofCompleteRequest | low | Standard kernel API - generally benign |
| ExAllocatePoolWithTag | low | Standard kernel API - generally benign |
| ExAllocatePool2 | low | Standard kernel API - generally benign |
| DbgPrintEx | low | Standard kernel API - generally benign |
| KeDelayExecutionThread | 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 |
|---|---|---|---|
| 0x0080908B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #1058 |
| 0x0080868B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #418 |
| 0x0080878B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #482 |
| 0x0080888B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #546 |
| 0x0080808B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #34 |
| 0x00808D8B | high | METHOD_NEITHER | FILE_DEVICE_CUSTOM Function #866 |
| 0x002200F0 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #60 |
| 0x00227FE8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #4090 |
| 0x008091B6 | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #1133 |
| 0x00808B48 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #722 |
| 0x00342BE8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #2810 |
| 0x0022BE38 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #3982 |
| 0x0080EC81 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #2848 |
| 0x002227E8 | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2554 |
| 0x00808E8A | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #930 |
| 0x0022200C | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2051 |
| 0x0022208C | medium | METHOD_BUFFERED | FILE_DEVICE_UNKNOWN Function #2083 |
| 0x00808B8A | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #738 |
| 0x0080BF80 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #4064 |
| 0x008000B8 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #46 |
| 0x0034BBE8 | medium | METHOD_BUFFERED | FILE_DEVICE_DISK Function #3834 |
| 0x0080B841 | medium | METHOD_IN_DIRECT | FILE_DEVICE_CUSTOM Function #3600 |
| 0x0080BF00 | medium | METHOD_BUFFERED | FILE_DEVICE_CUSTOM Function #4032 |
| 0x0080007E | medium | METHOD_OUT_DIRECT | FILE_DEVICE_CUSTOM Function #31 |
Showing 24 of 34 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 | 0x1650F | 0x16600 | 6.5 | CODE, EXEC, READ |
| .rdata | 0x1824 | 0x1A00 | 5.14 | IDATA, READ |
| .data | 0x0488 | 0x0200 | 2.03 | IDATA, READ, WRITE |
| .pdata | 0x09FC | 0x0A00 | 4.96 | IDATA, READ |
| PAGESRP0 | 0x63EC | 0x6400 | 6.4 | CODE, EXEC, READ |
| PAGE | 0x03AD | 0x0400 | 5.92 | CODE, EXEC, READ |
| PAGESER | 0x063A | 0x0800 | 5.31 | CODE, EXEC, READ |
| INIT | 0x0C98 | 0x0E00 | 5.44 | CODE, EXEC, READ, DISCARD |
| .rsrc | 0x0430 | 0x0600 | 2.56 | IDATA, READ, DISCARD |
| .reloc | 0x0058 | 0x0200 | 1.17 | 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 |
|---|---|---|
| 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 |
| T1569.002 | Service Execution | Execution |
| T1652 | Device Driver Discovery | Discovery |
| Signer | DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1 |
|---|---|
| Signer organisation | DigiCert, Inc. |
| Issuer | DigiCert Trusted Root G4 |
| Serial | 8AD40B260D29C4C9F5ECDA9BD93AED9 |
| Valid from | 2021-04-29 00:00 UTC |
| Valid until | 2036-04-28 23:59 UTC |
| Signature validity | Verified |
Engine angr, status completed, 51 paths explored at a maximum depth of 51. Vulnerability classes reached: 0. Exploitable paths: 2.
Based on DriverShield static and dynamic analysis, silabser.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.
silabser.sys has a DriverShield composite risk score of 18/100, placing it in the clean verdict band. SHA256: ca644642c189a216d67e4073f099a8768811d93a0257efd48dc3fc687a9390af.
silabser.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 Trusted G4 Code Signing RSA4096 SHA384 2021 CA1.
Related: Other drivers signed by DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1 · What an IOCTL dispatch code is · BYOVD research index · full driver database · CVE library · code signing atlas