GridinSoft Threat Intelligence
zlib1.dll threat report
GridinSoft Anti-Malware detection
Detected by GridinSoft before you download
The current ThreatInfo record shows this exact file hash detected as General Threat. Download GridinSoft Anti-Malware to scan the device, confirm whether this file is present, and remove the detected object if it is found.
- Detection name
- General Threat
- Recommended action
- Scan and remove
- Last analysis
- 2023-09-04 23:02:08 (2 years ago)
- File hash
- ef48e4156e01fc4ce97c420240b580d5
Why it matters
Why GridinSoft flags this file
GridinSoft identifies the sample as General Threat, part of the PUP threat category.
Potentially unwanted programs, bundlers, installers, and utilities with intrusive behavior. Related PUP reports help compare this file with nearby detections, publishers, and hashes.
First seen 2017-08-01 12:06:08 (8 years ago); latest analysis 2023-09-04 23:02:08 (2 years ago).
Product metadata: zlib.
Signed by Digital Wave Ltd. The signature is not reported as trusted and valid, which can indicate tampering, repackaging, or copied publisher data.
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
- Compare the MD5 above with the file found on the device.
- Check whether the file appears in the observed locations or under one of the alternate names.
- Run GridinSoft Anti-Malware to confirm the detection and remove the file if it is present. Review the PUP category for related samples and common context.
File context
zlib1.dll is a Windows file recorded in the ThreatInfo database. It is associated with zlib. The current detection status is General Threat, based on the latest analysis from 2023-09-04 23:02:08 (2 years ago). ThreatInfo groups this verdict with PUP reports for broader family-level investigation.
If zlib1.dll appears on your computer unexpectedly, treat it as suspicious. Check its location, digital signature, and recent system changes before allowing it to run. A full anti-malware scan is recommended when this file is detected as General Threat.
File Details
| Product Name: | zlib |
| MD5: | ef48e4156e01fc4ce97c420240b580d5 |
| Size: | 111 KB |
| First Published: | 2017-08-01 12:06:08 (8 years ago) |
| Latest Published: | 2023-09-04 23:02:08 (2 years ago) |
| Status: | General Threat (on last analysis) | |
| Analysis Date: | 2023-09-04 23:02:08 (2 years ago) |
Detection screenshot
The screenshot is a visual record of a GridinSoft Anti-Malware detection for this sample. Use the hash and metadata above as the primary identifiers when comparing the file on your system.
Overview
| Signed By: | Digital Wave Ltd |
| Status: | Invalid (digital signature could be stolen or file could be patched) |
The signature on zlib1.dll is not reported as trusted and valid. Invalid or suspicious signature data can indicate tampering, repackaging, or an unrelated file using copied publisher information.
Common Places:
| %commondir%\dvdvideosoft\lib |
| %commondir%\dvdvideosoft |
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 11 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is Algeria 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:
The most common operating system signal for zlib1.dll is Windows 7 with 50.0% 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.
fec1a00b760f5e85512b0e9c90235f19
d98dcaa8ebf568009fc550f631b95594
592e3dff0dbc4bc2d05206086957012d
00000000000000000000000000000000
f125b1f7467777587cfcf5f62792c8e6
f177d53f5b3483be044d900fd7101138
e98f5ea72365134db6af6d571ceb240b
129fc74a3aafa04286a1e0d08421380e
42faa36c15b10475f8160f199c2b247f
91e73ff6158e4b438d383a84fe8a8421
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
GridinSoft detects this file as General Threat
This report identifies zlib1.dll by MD5 ef48e4156e01fc4ce97c420240b580d5. It is part of the PUP report group. If the same file is present on your device, scan the system and remove the detected object after confirming the hash and location.