GridinSoft Threat Intelligence

zlib1.dll file report

Under review File reputation report
MD5 f5df3e2ea8201f68c356317de75ef4e1
Latest seen 2023-11-09 23:21:11 (2 years ago)
First seen 2017-05-31 22:05:16 (8 years ago)
Size 93 KB
Product zlib

Why it matters

Evidence available for this file

Detection

No final classification is available yet.

Timeline

First seen 2017-05-31 22:05:16 (8 years ago); latest analysis 2023-11-09 23:21:11 (2 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 2023-11-09 23:21:11 (2 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: f5df3e2ea8201f68c356317de75ef4e1
Size: 93 KB
First Published: 2017-05-31 22:05:16 (8 years ago)
Latest Published: 2023-11-09 23:21:11 (2 years ago)
Status: Undefined (on last analysis)
Analysis Date: 2023-11-09 23:21:11 (2 years ago)

Common Places:

%programfiles%\pcdata
%profile%\appdata\locallow
%localappdata%\math problem solver\cpu
%windir%\init\spoolv64
%localappdata%
%programfiles%
%localappdata%\math problem solver

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 21 countries. Use this signal to compare local evidence with where the sample is most often reported.

Top country India
Share 16.7%
Low High activity

The strongest geographic signal for this file is India with 16.7% of observed hits. Geographic distribution can help identify targeted campaigns, regional software bundles, or where a file is most commonly reported.

OS Version:

Windows 7 58.3%
Windows 10 27.8%
Windows 8.1 11.1%
Windows 8 2.8%

The most common operating system signal for zlib1.dll is Windows 7 with 58.3% 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 64-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 64-bit
Subsystem Windows CUI
Entry point 0x000013f0
Image base 0x0000000062e80000

PE Sections:

Sections 12
Raw data 94720

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

.text 65024 bytes · 68.6% of section data
MD5 a24f0da9be7a8a5a73fbe6effcb3529c
.data 512 bytes · 0.5% of section data
MD5 a73103704c431129fd729dd4f921b8be
.rdata 18432 bytes · 19.5% of section data
MD5 86076968d086796f6142e4e393a3a2dd
.pdata 2048 bytes · 2.2% of section data
MD5 37b85f4452fc04b3a1dbd76caa2fe177
.xdata 2048 bytes · 2.2% of section data
Uncommon name
MD5 9f2bee2c0d5eaf1cf587c782d7d80a7a
.bss 0 bytes · 0.0% of section data
MD5 00000000000000000000000000000000
.edata 2048 bytes · 2.2% of section data
MD5 6d6d10cb1aae49efd135047dc52efa3d
.idata 2048 bytes · 2.2% of section data
MD5 d04a25d65a7b73a667df297fb1e5b0a7
.CRT 512 bytes · 0.5% of section data
MD5 d2f12cefd3a373dbe686d7a072d4063c
.tls 512 bytes · 0.5% of section data
MD5 eebe308ae1ed962bd9ac49b889ba10ad
.rsrc 1024 bytes · 1.1% of section data
MD5 f23d6c9f400589037ce2c17a67baa1ce
.reloc 512 bytes · 0.5% of section data
MD5 8cc8618562772b2d5607cd3df8957b74

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 f5df3e2ea8201f68c356317de75ef4e1.
  • 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.