GridinSoft Threat Intelligence
zlib file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2017-05-21 07:08:16 (9 years ago); latest analysis 2025-11-23 23:01:27 (6 months ago).
Product metadata: ZLib.DLL.
Signed by Megaify Software Co.,Ltd.. The signature is reported as valid, but signed files can still be bundled or abused.
This hash has appeared under multiple file names, which can happen with repackaging, bundling, or deliberate renaming.
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
zlib is a Windows file recorded in the ThreatInfo database. It is associated with ZLib.DLL. The current detection status is Undefined, based on the latest analysis from 2025-11-23 23:01:27 (6 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.DLL |
| MD5: | f59ad5e4b0cc94ae0089f633df6bb0cf |
| Size: | 90 KB |
| First Published: | 2017-05-21 07:08:16 (9 years ago) |
| Latest Published: | 2025-11-23 23:01:27 (6 months ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2025-11-23 23:01:27 (6 months ago) |
Overview
| Signed By: | Megaify Software Co.,Ltd. |
| Status: | Valid |
The signature on zlib 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:
| %programfiles%\drivertoolkit |
| %sysdrive%\$recycle.bin\s-1-5-21-3196843707-3211194559-215823176-1000\$rk6wpeb |
| %sysdrive%\adwcleaner\quarantine\files\vhbhxapmqrxrxozjfenzdllnqjhhpuxp |
| %sysdrive%\adwcleaner\quarantine\files\kprqatmwjhkekkftyskhsuzqqafcsvvq |
| %sysdrive%\adwcleaner\quarantine\files\hkxqnbodtaekeziglxgyydqfvhqkinpx |
| %sysdrive%\system volume information\_restore{ac9dde38-bca3-4eab-8bf6-d625224cf9d9}\rp16 |
| %sysdrive%\adwcleaner\quarantine\files\dphisnwozuhhupyrefssmcpmtnvejcds |
| %sysdrive%\system volume information\_restore{ccbe18a5-b19c-4fb7-84a5-aaea3415f8c4}\rp6 |
| %sysdrive%\adwcleaner\quarantine\files\bfrevrbxsvgrufnjfqfgfckxnfjdrptb |
| %sysdrive%\system volume information\_restore{d09f9a31-5302-4944-a394-79a700035250}\rp182 |
ThreatInfo has observed zlib 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.
File Names:
12 observed namesThis hash has been seen with multiple file names. Alternate names can appear when software is updated, copied between folders, packed by an installer, or deliberately renamed to avoid recognition. Compare the exact MD5 above before assuming two names refer to the same file.
Geographic signal
Observed country distribution
ThreatInfo has seen zlib across 103 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is Indonesia with 6.4% 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 zlib is Windows 10 with 47.8% 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
zlib 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.
4cd1464f73ca0f811fbb250692200f6b
bc1a30dbaab60bf653dbd307787fd6d9
ea69fa7bee84d2f4051fbb764709bd8b
59f6bd7702c60fbf5b41b2a34cea3245
13fae8e694170f4fb044274fb229a799
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.