GridinSoft Threat Intelligence
zlib1.dll file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2017-06-09 10:02:59 (8 years ago); latest analysis 2023-09-19 23:54:20 (2 years ago).
Product metadata: zlib.
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 2023-09-19 23:54:20 (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: | 99e402544e67c8b57be64cac89760f3f |
| Size: | 72 KB |
| First Published: | 2017-06-09 10:02:59 (8 years ago) |
| Latest Published: | 2023-09-19 23:54:20 (2 years ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2023-09-19 23:54:20 (2 years ago) |
Common Places:
| %system%\mpk |
| %system% |
| %commonappdata% |
| %programfiles% |
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 23 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is Russian Federation with 27.0% 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 7 with 46.8% 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 GUI. 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.
81a3fb3b51998becac213ea9b319a568
ffd117c2b9259afb796299acd5e21e05
4fe5040286fba4828c69d580278aa073
04e9094c5c0dc8a166fdd6f87c9f5084
20be3009558b4c06ec76cf0f81da647e
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.