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The winload.efi.mui (OS Loader) File Analysis

Updated 2 months ago
Checked by Malaware Check
winload.efi.mui

Technical Analysis

File Name winload.efi.mui
File Type
PE32 executable (DLL) (GUI) Intel 80386, for MS Windows
Scanner Version 1.0.210.174
Database Version 2025-03-12 23:00:44 UTC
✓

Clean File

No threats detected by our scanner

0%
Detection Rate
33,096
File Size (bytes)
2025-03-12
Analysis Date

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File Identification

Hash Type Value Action
MD5
37ab17f23fa48f66f53c6484b402677a
SHA1
32beefcb5281f6d50ffa6dcf7b2d5a4b8b8548c1
SHA256
0020d9b52a12f51dcbe99f85e37678406ebaf042155c591a82ca26ea8bf61f58
SHA512
268f59dbd701a9dd24f001fa71284c2d8ba2b8f739bc872a34143f7deacc62813ded98fc6f5e73f3a0b5e1f9f7894ff96dd0afcc960dd6d12b5448a529334366

PE Analysis

Basic Information

▼
Image Base 0x10000000
Entry Point 0x10000000
Compilation Time 2008-10-09 23:57:06
Checksum 0x0000d4dd (Actual: 0x0000d4dd)
OS Version 5.0
PEiD Signatures PE32 executable (DLL) (GUI) Intel 80386, for MS Windows
Digital Signature OK
Imports 0
Exports 0 functions
Resources 4 Resources
Sections 1 Sections

Version Information

▼
CompanyName Microsoft Corporation
FileDescription OS Loader
FileVersion 10.0.19041.3636 (WinBuild.160101.0800)
InternalName osloader.exe
LegalCopyright © Microsoft Corporation. All rights reserved.
OriginalFilename osloader.exe
ProductName Microsoft® Windows® Operating System
ProductVersion 10.0.19041.3636
Translation 0x0409 0x04b0

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.rsrc 0x00001000 24,576 bytes 22,528 bytes 3.63 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 62F2C8C278318AA25FEF0A9D5364B1C1

Resource Analysis

▼
Total Resources: 4 (21,694 bytes)
Resource Type Count Total Size Percentage
MUI 1 184 bytes
0.8%
RT_MESSAGETABLE 1 6,432 bytes
29.6%
RT_VERSION 1 900 bytes
4.1%
RT_HTML 1 14,178 bytes
65.4%

Certificate Chain Analysis

▼
Certificate Information
Product Microsoft® Windows® Operating System
Description OS Loader
File Version 10.0.19041.3636 (WinBuild.160101.0800)
Original Name osloader.exe
Signing Date 03:18 AM 10/20/2023 (596 days ago)
Verification Status Signed
Signers Microsoft Windows; Microsoft Windows Production PCA 2011; Microsoft Root Certificate Authority 2010
Counter Signers Microsoft Time-Stamp Service; Microsoft Time-Stamp PCA 2010; Microsoft Root Certificate Authority 2010
Internal Name osloader.exe
Copyright © Microsoft Corporation. All rights reserved.
Certificate Chain Summary
Microsoft Windows #1 Primary
Validity Period: 2023-02-03 00:05:41 → 2024-02-01 00:05:41
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 04 13 31 BC 19 88 07 A9 07 74 00 00 00 00 04 13
Microsoft Windows Production PCA 2011 #2 Chain
Validity Period: 2011-10-19 18:41:42 → 2026-10-19 18:51:42
Signature Algorithm: sha256RSA
Serial Number: 61 07 76 56 00 00 00 00 00 08
Microsoft Time-Stamp Service #3 Chain
Validity Period: 2023-05-25 19:12:21 → 2024-02-01 19:12:21
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 01 D2 21 24 31 4A 58 BF 2D 11 00 01 00 00 01 D2
Microsoft Time-Stamp PCA 2010 #4 Chain
Validity Period: 2021-09-30 18:22:25 → 2030-09-30 18:32:25
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 00 15 C5 E7 6B 9E 02 9B 49 99 00 00 00 00 00 15

✓ This file has been digitally signed and the certificate chain has been verified

  • The signature ensures file integrity and authenticity from the publisher
  • Timestamping proves when the signature was applied
Certificate Verification Status

OK

Remember: This is Result of Online Virus Scanner

Gridinsoft Anti-Malware has a much more powerful virus scanning engine. We recommend using it for a more precise diagnosis of infected systems. This brief guide will help you install our flagship product for more accurate diagnostics:

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Keep Your System Protected

This file appears clean, but regular security maintenance is important

  1. Regular Scans: Run weekly system scans to detect new threats before they can cause damage.
  2. Keep Software Updated: Ensure your operating system and all applications have the latest security patches.
  3. Safe Browsing: Avoid suspicious websites and never download software from untrusted sources.
  4. Email Security: Be cautious with email attachments and links, even from known contacts.
Proactive Protection
This file passed all security checks, but stay vigilant. New malware variants appear daily that can evade detection. Always verify files come from official sources and check digital signatures when available.

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