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The ucrtbase.dll (Microsoft® C Runtime Library) File Analysis

Updated 1 month ago
Checked by Malware Check
ucrtbase.dll

Technical Analysis

File Name ucrtbase.dll
File Type
PE32+ executable (DLL) (console) x86-64, for MS Windows
Scanner Version 1.0.230.174
Database Version 2025-12-10 22:00:28 UTC
✓

Clean File

No threats detected by our scanner

0%
Detection Rate
1,035,728
File Size (bytes)
2025-12-10
Analysis Date

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File Identification

Hash Type Value Action
MD5
849959a003fa63c5a42ae87929fcd18b
SHA1
d1b80b3265e31a2b5d8d7da6183146bbd5fb791b
SHA256
6238cbfe9f57c142b75e153c399c478d492252fda8cb40ee539c2dcb0f2eb232
SHA512
64958dabdb94d21b59254c2f074db5d51e914ddbc8437452115dff369b0c134e50462c3fdbbc14b6fa809a6ee19ab2fb83d654061601cc175cddcb7d74778e09
ImpHash
405cde0fc80c30dcc3d783173dbd4143

PE Analysis

Basic Information

▼
Image Base 0x180000000
Entry Point 0x180015a30
Compilation Time 1989-09-30 12:04:00
Checksum 0x00105e37 (Actual: 0x00105e37)
OS Version 10.0
PEiD Signatures PE32+ executable (DLL) (console) x86-64, for MS Windows
PDB Path ucrtbase.pdb
Digital Signature OK
Imports 25 libraries
Exports 2484 functions
Resources 1 Resources
Sections 6 Sections

Version Information

▼
CompanyName Microsoft Corporation
FileDescription Microsoft® C Runtime Library
FileVersion 10.0.19041.685 (WinBuild.160101.0800)
InternalName ucrtbase.dll
LegalCopyright © Microsoft Corporation. All rights reserved.
OriginalFilename ucrtbase.dll
ProductName Microsoft® Windows® Operating System
ProductVersion 10.0.19041.685
Translation 0x0409 0x04b0

PE Sections

▼
Name Virtual Address Virtual Size Raw Size Entropy Characteristics MD5
.text 0x00001000 735,536 bytes 735,744 bytes 6.52 (Compressed) IMAGE_SCN_CNT_CODE|IMAGE_SCN_MEM_EXECUTE|IMAGE_SCN_MEM_READ 7E66013F8B561C86415C9770CE1DC618
.rdata 0x000b5000 233,822 bytes 233,984 bytes 5.95 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ 58DFA5C0F9F79D12FF1B4505294DF7FC
.data 0x000ef000 9,972 bytes 4,608 bytes 2.05 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ|IMAGE_SCN_MEM_WRITE 6352807722565AEB7ED619B0197AEB5B
.pdata 0x000f2000 46,740 bytes 47,104 bytes 5.97 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ BD53396530BFCFFD33BF246291443DC1
.rsrc 0x000fe000 1,040 bytes 1,536 bytes 2.49 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_READ BF14271FD1F5BF7E0F4549923EC9D8FC
.reloc 0x000ff000 2,808 bytes 3,072 bytes 5.29 (Normal) IMAGE_SCN_CNT_INITIALIZED_DATA|IMAGE_SCN_MEM_DISCARDABLE|IMAGE_SCN_MEM_READ C725F9C0705EC2E63808855B83D227BC
Entropy Analysis Alert

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

Resource Analysis

▼
Total Resources: 1 (944 bytes)
Resource Type Count Total Size Percentage
RT_VERSION 1 944 bytes
100%

Certificate Chain Analysis

▼
Certificate Information
Product Microsoft® Windows® Operating System
Description Microsoft® C Runtime Library
File Version 10.0.19041.685 (WinBuild.160101.0800)
Original Name ucrtbase.dll
Signing Date 01:30 PM 12/02/2020 (1864 days ago)
Verification Status Signed
Signers Microsoft Corporation; Microsoft Code Signing PCA 2010; Microsoft Root Certificate Authority 2010
Counter Signers Microsoft Time-Stamp Service; Microsoft Time-Stamp PCA 2010; Microsoft Root Certificate Authority 2010
Internal Name ucrtbase.dll
Copyright © Microsoft Corporation. All rights reserved.
Certificate Chain Summary
Microsoft Corporation #1 Primary
Validity Period: 2020-03-04 18:29:29 → 2021-03-03 18:29:29
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 03 26 AE CE ED F9 BC E4 7B 92 00 00 00 00 03 26
Microsoft Code Signing PCA 2010 #2 Chain
Validity Period: 2010-07-06 20:40:17 → 2025-07-06 20:50:17
Signature Algorithm: sha256RSA
Serial Number: 61 0C 52 4C 00 00 00 00 00 03
Microsoft Time-Stamp Service #3 Chain
Validity Period: 2019-12-19 01:15:05 → 2021-03-17 01:15:05
Signature Algorithm: sha256RSA
Serial Number: 33 00 00 01 2E A8 D2 19 07 93 F4 6B E8 00 00 00 00 01 2E
Microsoft Time-Stamp PCA 2010 #4 Chain
Validity Period: 2010-07-01 21:36:55 → 2025-07-01 21:46:55
Signature Algorithm: sha256RSA
Serial Number: 61 09 81 2A 00 00 00 00 00 02

✓ 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

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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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