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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
34,104
File Size (bytes)
2025-03-12
Analysis Date

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File Identification

Hash Type Value Action
MD5
5bb51c582ae977f2fe0f4afa26cd8d45
SHA1
aa54e1743cc2f668c9a05d44760e15ffa31024b9
SHA256
ae240b4faae154d51be72faf0bcf6be3d019f6a80b8c83e4a8c5320b4994f91c
SHA512
edef8c700fae15d44696ac3820e27a96d7b525c9753444d008897e14ccec5a0df2d01b55deb000834a6a8223a6b626206cdabf3d33d0b2db0f91cc71fdf84b8a

PE Analysis

Basic Information

▼
Image Base 0x10000000
Entry Point 0x10000000
Compilation Time 2008-10-09 23:57:06
Checksum 0x00010f62 (Actual: 0x00010f62)
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 © Корпорация Майкрософт. Все права защищены.
OriginalFilename osloader.exe
ProductName Операционная система Microsoft® Windows®
ProductVersion 10.0.19041.3636
Translation 0x0419 0x04b0

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.rsrc 0x00001000 24,576 bytes 23,552 bytes 4.25 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 12B9058FB1C67EB5E278F040E37B5DA5

Resource Analysis

▼
Total Resources: 4 (23,094 bytes)
Resource Type Count Total Size Percentage
MUI 1 184 bytes
0.8%
RT_MESSAGETABLE 1 7,176 bytes
31.1%
RT_VERSION 1 908 bytes
3.9%
RT_HTML 1 14,826 bytes
64.2%

Certificate Chain Analysis

▼
Certificate Information
Product Операционная система Microsoft® Windows®
Description OS Loader
File Version 10.0.19041.3636 (WinBuild.160101.0800)
Original Name osloader.exe
Signing Date 10:36 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 © Корпорация Майкрософт. Все права защищены.
Certificate Chain Summary
Microsoft Windows #1 Primary
Validity Period: 2023-02-03 00:05:42 → 2024-02-01 00:05:42
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 04 15 82 95 A1 A3 D8 2E 28 57 00 00 00 00 04 15
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 19:12:01 → 2024-02-01 19:12:01
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 01 CC 86 A5 DC 37 EB D9 61 2D 00 01 00 00 01 CC
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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