GridinSoft Threat Intelligence

zlib1.dll file report

Under review File reputation report
MD5 fb072e9f69afdb57179f59b512f828a4
Latest seen 2021-04-19 20:50:16 (5 years ago)
First seen 2017-05-26 08:01:51 (9 years ago)
Size 105 KB
Product zlib

Why it matters

Evidence available for this file

Detection

No final classification is available yet.

Timeline

First seen 2017-05-26 08:01:51 (9 years ago); latest analysis 2021-04-19 20:50:16 (5 years ago).

Publisher context

Product metadata: zlib.

Observed locations

ThreatInfo has seen this file in user or system paths listed below. Unexpected locations increase the need for local verification.

Recommended action

What to do next

  1. Use the hash and metadata below to verify the exact file identity.
  2. Review publisher, signature, paths, and PE details for inconsistencies.
  3. Run a local scan if the file appears unexpectedly or starts with Windows.

File context

zlib1.dll is a Windows file recorded in the ThreatInfo database. It is associated with zlib. The current detection status is Undefined, based on the latest analysis from 2021-04-19 20:50:16 (5 years ago).

ThreatInfo does not have a final classification for this file yet. Use the technical details below to compare the hash, size, signature, and observed locations with the copy found on your device.

File Details

Product Name: zlib
MD5: fb072e9f69afdb57179f59b512f828a4
Size: 105 KB
First Published: 2017-05-26 08:01:51 (9 years ago)
Latest Published: 2021-04-19 20:50:16 (5 years ago)
Status: Undefined (on last analysis)
Analysis Date: 2021-04-19 20:50:16 (5 years ago)

Common Places:

%localappdata%\freeu\application\56.1.2924.38\freeu_helper
%localappdata%\freeu\application\56.1.2924.62\freeu_helper
%localappdata%\freeu\application\56.1.2924.71\freeu_helper
%localappdata%\freeu\application\56.1.2924.82\freeu_helper
%localappdata%\freeu\application\56.1.2924.93\freeu_helper
%appdata%
%localappdata%\freeu\application\56.1.2924.93
%appdata%\tp
%localappdata%\freeu\application\56.1.2924.71
%localappdata%\freeu\application\56.1.2924.82

ThreatInfo has observed zlib1.dll in the locations listed above. Files found in temporary folders, user profile folders, startup locations, or unusual application directories should be reviewed more carefully than files installed under a known program directory.

Geographic signal

Observed country distribution

ThreatInfo has seen zlib1.dll across 17 countries. Use this signal to compare local evidence with where the sample is most often reported.

Top country Ukraine
Share 79.8%
Low High activity

The strongest geographic signal for this file is Ukraine with 79.8% of observed hits. Geographic distribution can help identify targeted campaigns, regional software bundles, or where a file is most commonly reported.

OS Version:

Windows 10 53.1%
Windows 7 35.9%
Windows 8.1 10.2%
Windows 8 0.6%
Windows Server 2008 R2 0.3%

The most common operating system signal for zlib1.dll is Windows 10 with 53.1% of observed hits. If your system differs from the common profile, check whether the file was introduced by a specific installer, archive, or removable device.

Analysis

zlib1.dll is identified as pe for 32-bit systems. The subsystem is Windows CUI. PE header values are useful for triage, especially when they do not match the expected publisher, product, or release timeline.

Format pe
Architecture 32-bit
Subsystem Windows CUI
Entry point 0x00001400
Image base 0x62e80000

PE Sections:

Sections 10
Raw data 106496

Section layout highlights raw-size concentration, repeated names, packer markers, and hashes that can be compared across related samples.

.text 75264 bytes · 70.7% of section data
MD5 dfcdf8f98275cee9aaacc44dc4d08c1f
.data 512 bytes · 0.5% of section data
MD5 2f69c143adaf9038ab1bb25d8127ef17
.rdata 22528 bytes · 21.2% of section data
MD5 4ab484d89d13be5cfd9e37225f865e43
.bss 0 bytes · 0.0% of section data
MD5 00000000000000000000000000000000
.edata 2048 bytes · 1.9% of section data
MD5 5e73d3a605c777b76136c400cecb94db
.idata 1536 bytes · 1.4% of section data
MD5 69a168ec20a8e673fd3d3589231d4359
.CRT 512 bytes · 0.5% of section data
MD5 52c1397300fc4f25a0028f68193139f9
.tls 512 bytes · 0.5% of section data
MD5 56a8784c8de6c1fd0593c9f71e79240b
.rsrc 1024 bytes · 1.0% of section data
MD5 a8df5a53ec1265f516de0c9387937ff1
.reloc 2560 bytes · 2.4% of section data
MD5 f1595c5f6caf641f2c5b5528fef9250b

PE section names and hashes can reveal packing, injected resources, or unusual build artifacts. Sections with uncommon names, very large raw data, or hashes that differ from a trusted copy deserve additional review.

Report conclusion

This file is still under review

ThreatInfo has not assigned a final verdict yet. Compare the file hash, location, signature, and publisher before trusting the file on a production system.

Scan with GridinSoft Anti-Malware Use a local scan if the file origin or behavior is unclear. Check this hash on VirusTotal

Recommended next steps

  • Compare the local file MD5 with fb072e9f69afdb57179f59b512f828a4.
  • Check the file path, publisher, and signature against the details in this report.
  • Run a GridinSoft scan if the source, path, or behavior looks unusual.