GridinSoft Threat Intelligence
mozcrt19.dll file report
Why it matters
Evidence available for this file
No final classification is available yet.
First seen 2017-05-21 06:06:37 (9 years ago); latest analysis 2026-05-14 03:00:15 (a week ago).
Company metadata: Mozilla Foundation. Product metadata: Mozilla Custom C Runtime.
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
mozcrt19.dll is a Windows file recorded in the ThreatInfo database. It is associated with Mozilla Custom C Runtime. The reported company name is Mozilla Foundation. The current detection status is Undefined, based on the latest analysis from 2026-05-14 03:00:15 (a week 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: | Mozilla Custom C Runtime |
| Company Name: | Mozilla Foundation |
| MD5: | 35d6dd2af53c78cb9cfb1050c007b8c6 |
| Size: | 688 KB |
| First Published: | 2017-05-21 06:06:37 (9 years ago) |
| Latest Published: | 2026-05-14 03:00:15 (a week ago) |
| Status: | Undefined (on last analysis) | |
| Analysis Date: | 2026-05-14 03:00:15 (a week ago) |
Common Places:
| %programfiles%\qqmailplugin |
| %appdata%\tencent\qq\webkit\plugin\qqmailplugin |
| %programfiles% |
| %appdata%\tencent\qq\webkit\plugin |
ThreatInfo has observed mozcrt19.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 mozcrt19.dll across 45 countries. Use this signal to compare local evidence with where the sample is most often reported.
The strongest geographic signal for this file is Taiwan with 33.5% 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 mozcrt19.dll is Windows 10 with 70.7% 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
mozcrt19.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.
b1be7ea938d168aeb59561f200163826
ad981582682bfc1fe38361feb498ebd5
fd6c4b35b9794333d35587ca0592f4ff
c0ba0ac8244303368539348b7cb32d10
f3e886e03753941ad0d3e5177f4ba88c
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.