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The winload.efi (OS Loader) File Analysis

Updated 2 months ago
Checked by Malaware Check
winload.efi

Technical Analysis

File Name winload.efi
File Type
PE32+ executable (DLL) x86-64, 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
1,852,896
File Size (bytes)
2025-03-12
Analysis Date

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File Identification

Hash Type Value Action
MD5
9eddccfff64e24b3254b8d29c2923a66
SHA1
63935a6d365c292cec27a7556a44cd766c7a1f2d
SHA256
37146d70b57274be1c5a6b62b897a2ea62e72af94d66f7c211e5c5bb8410cf9b
SHA512
64c94f302c497a83eac5ea659f0ba7fc7ad28226072a2b9b1554a96cd50914558e40f7069d625597ecb7a5a64777829aecb51be18fe5e7ed4e6419af6b665477

PE Analysis

Basic Information

▼
Image Base 0x180000000
Entry Point 0x180001090
Compilation Time 2048-07-18 20:42:08
Checksum 0x001d31b5 (Actual: 0x001d31b5)
OS Version 0.0
PEiD Signatures PE32+ executable (DLL) x86-64, for MS Windows
PDB Path winload_prod.pdb
Digital Signature OK
Imports 0
Exports 392 functions
Resources 5 Resources
Sections 11 Sections

Version Information

▼
CompanyName Microsoft Corporation
FileDescription OS Loader
FileVersion 10.0.19041.5438 (WinBuild.160101.0800)
InternalName osloader.exe
LegalCopyright © Microsoft Corporation. All rights reserved.
OriginalFilename osloader.exe
ProductName Microsoft® Windows® Operating System
ProductVersion 10.0.19041.5438
Translation 0x0409 0x04b0

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.text 0x00001000 1,501,289 bytes 1,501,696 bytes 6.50 (Compressed) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ EFEC49E3522EB2AAB5CDEDB27DEC9BFB
PAGER32C 0x00170000 729 bytes 1,024 bytes 4.55 (Normal) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ CE42E191C9BE3A32935F0D85728C8F72
TRANSIT 0x00171000 29 bytes 512 bytes 0.45 (Normal) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 863D89C1D654B0E7B28D0AE4F3635E62
PAGE 0x00172000 39,005 bytes 39,424 bytes 6.34 (Normal) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 68E379A1A315CD91AC170B7FEC15205D
PAGEDATA 0x0017c000 32 bytes 0 bytes 0.00 (Normal) IMAGE_SCN_CNT_UNINITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE D41D8CD98F00B204E9800998ECF8427E
.rdata 0x0017d000 197,147 bytes 197,632 bytes 5.41 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ DE2DBA021CB1CC6A59644E89F74AB1F3
.data 0x001ae000 273,184 bytes 3,584 bytes 4.56 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE A7BDB1109862E6A482655321369F12BC
.pdata 0x001f1000 54,600 bytes 54,784 bytes 6.12 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 50FD256DB9718214C6A088146ED777B6
PAGECONS 0x001ff000 40 bytes 512 bytes 0.46 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ ED5EF8EB7827280645E8399649BD3EE8
.rsrc 0x00200000 22,192 bytes 22,528 bytes 3.61 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 1EF87F35BDA6DB7DDF07451E3CA8693E
.reloc 0x00206000 4,024 bytes 4,096 bytes 5.44 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_DISCARDABLE|IMAGE_SCN_MEM_READ E59BA87E25DC8CCEF3FDD38DC5804135
Entropy Analysis Alert

1 section(s) with elevated entropy (≥6.5) - possible compression

Resource Analysis

▼
Total Resources: 5 (21,734 bytes)
Resource Type Count Total Size Percentage
MUI 1 216 bytes
1%
RT_RCDATA 1 4 bytes
0%
RT_MESSAGETABLE 1 6,432 bytes
29.6%
RT_VERSION 1 904 bytes
4.2%
RT_HTML 1 14,178 bytes
65.2%

Certificate Chain Analysis

▼
Certificate Information
Product Microsoft® Windows® Operating System
Description OS Loader
File Version 10.0.19041.5438 (WinBuild.160101.0800)
Original Name osloader.exe
Signing Date 06:03 PM 01/22/2025 (135 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: 2024-09-12 20:04:06 → 2025-09-11 20:04:06
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 04 A7 04 3E E4 22 C8 34 FA FC 00 00 00 00 04 A7
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: 2023-12-06 18:45:51 → 2025-03-05 18:45:51
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 01 F0 2A 7C 1D 59 3B E6 1F AD 00 01 00 00 01 F0
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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