GridinSoft Threat Intelligence
zstd.dll file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2026-03-31 23:00:56 (2 months ago); latest analysis 2026-03-31 23:00:56 (2 months ago).
Company metadata: Meta Platforms, Inc.. Product metadata: Zstandard.
Signed by PC Helpsoft (7270356 Canada Inc). 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
zstd.dll is a Windows file recorded in the ThreatInfo database. It is associated with Zstandard. The reported company name is Meta Platforms, Inc.. The current detection status is Undefined, based on the latest analysis from 2026-03-31 23:00:56 (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: | Zstandard |
| Company Name: | Meta Platforms, Inc. |
| MD5: | 8174e0e35b3319f81ce6cf2434bb71db |
| Size: | 656 KB |
| First Published: | 2026-03-31 23:00:56 (2 months ago) |
| Latest Published: | 2026-03-31 23:00:56 (2 months ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2026-03-31 23:00:56 (2 months ago) |
Overview
| Signed By: | PC Helpsoft (7270356 Canada Inc) |
| Status: | Valid |
The signature on zstd.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:
| %programfiles%\pchelpsoft\driver updater |
ThreatInfo has observed zstd.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 zstd.dll across 1 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is United States with 100.0% 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 zstd.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
zstd.dll is identified as pe for 64-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.
bdaef8989ef8ad3a2a8d7cdf8d0d891e
669f983b68693e0c54a1f1071cd97d87
b3ba7e2ebcd1a2a4f4ce2f446622ad3f
1a8f47ef3810e231bbab76bc2d580e97
4eb0d88f3a8626f8d4b0fda5379fd10f
2d0eb925259a99a7a6cc7625101aea8d
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.