GridinSoft Threat Intelligence
zlib1.dll file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2024-02-11 23:21:53 (2 years ago); latest analysis 2026-03-05 23:01:30 (2 months ago).
Product metadata: zlib.
Signed by g10 Code GmbH. The signature is reported as valid, but signed files can still be bundled or abused.
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
- Use the hash and metadata below to verify the exact file identity.
- Review publisher, signature, paths, and PE details for inconsistencies.
- 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 2026-03-05 23:01:30 (2 months 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: | 8f4cdaed2399204619310cd76fd11056 |
| Size: | 141 KB |
| First Published: | 2024-02-11 23:21:53 (2 years ago) |
| Latest Published: | 2026-03-05 23:01:30 (2 months ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2026-03-05 23:01:30 (2 months ago) |
Overview
| Signed By: | g10 Code GmbH |
| Status: | Valid |
The signature on zlib1.dll is reported as valid. A valid signature helps confirm publisher identity, but it does not automatically make the file safe if the installer was bundled, abused, or downloaded from an untrusted source.
Common Places:
| %appdata% |
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 9 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is Spain with 47.1% of observed hits. Geographic distribution can help identify targeted campaigns, regional software bundles, or where a file is most commonly reported.
OS Version:
The most common operating system signal for zlib1.dll is Windows 10 with 100.0% 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.
PE Sections:
Section layout highlights raw-size concentration, repeated names, packer markers, and hashes that can be compared across related samples.
dd7e435eaf277d9ba5a0db91e30c9861
4f9b73cb499d4ea6f872c043e3180868
cbe9d5f602604cf3b808431ef19567b6
2f7a83249141e23993e3981aa065e1ff
d41d8cd98f00b204e9800998ecf8427e
32a5dd8efbbf15d7fda491e90e43a7fe
310a3c76ba230be4a7460f53ce9b5e6f
0cdd0c24499e8fff85b3e0d59e018e89
bf619eac0cdf3f68d496ea9344137e8b
e8ebd9f8ae67c5cb6a14b98adb749c2c
b421344ec0ea449deac43f0d5077b40d
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.