File scan report
Verdict Safe
Is Mono
This Mono runtime helper library is widely distributed and listed in a known-software reference set, and none of the 70 antivirus engines that checked it flagged it.
Read the whole reasonShow less
Strong evidence · Widely seen for a long time, and nothing harmful found.
No action is needed. Keep the file if it came with an application you use, and keep your security software enabled.
Good practice2 tips
We found nothing harmful in this file.
Use it only as part of a program you got from the developer's own website.
Keep your antivirus and Windows updates switched on.
No scanner can promise a file is 100% safe.
Antivirus results
0 of 70 flagged
- Flagged 0
- No detection 70
- No result 4
- Code signing Unsigned
- Test run Completed
- First seen 4y ago
Chapter 02
Why we think so
0 points against it and 4 in its favour, checked against the scan evidence.
The reasoning behind this verdict
It matches a known-good software reference entry and has been submitted by 228 sources since it was first seen on Nov 20, 2021. The combined sandbox verdict was clean, with no high-risk techniques observed.
None of the 70 antivirus engines that checked it detected the file, including all 18 major antivirus engines that reported on it. The hash appears in the NIST known-software reference set under the same name, and 228 independent sources have submitted it since it was first seen on Nov 20, 2021. The combined sandbox verdict was clean, and no injection target or high-risk technique was recorded. The only network contacts were the analysis machine's own background traffic. The antivirus analysis found no packing, and the file is a standard Visual C++ build. It is unsigned, but that is normal for this kind of runtime helper library.
What We Detected
None of the 70 antivirus engines that checked it flagged this DLL. It matches a known-good entry in a software reference database and has been widely shared since it was first seen on Nov 20, 2021.
Threat Behavior
The combined sandbox verdict was clean. No high-risk techniques were observed, no other process was targeted, and the only network contacts were the analysis machine's background traffic. The file is not packed.
What To Do Now
No action is needed. This library is part of the Mono runtime used by many applications. As with any DLL, it is best obtained through the application that ships it.
Where this verdict could be wrong2 caveats
- The file is unsigned, so its publisher cannot be confirmed from a signature, though the known-software reference entry and wide distribution offset this.
- Two community annotations from an outside analysis service labelled it greyware, without naming any malicious behaviour.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- None of the 70 antivirus engines that checked it flagged the file
- Listed as a known-good entry in a software reference database
- Submitted by 228 sources since Nov 20, 2021
- The combined sandbox verdict was clean, with no high-risk techniques observed
6 sources checked · all complete. See every source
Chapter 03
What it did in our test
It ran in 5 isolated tests; no test environment rated what it did as risky.
Test run summary
Capture complete- 5isolated sandbox runs
- 15sandbox rule tags
- 15spawned processes
- 0network contacts
- 40filesystem & mutex artifacts
Includes the sandbox verdicts, 15 mapped techniques, every process, file, registry and network entry and 10 dropped files.
Show the technical evidenceChapter 04
Technical details
None of the 70 antivirus engines that checked it flag it; no publisher signature.
Sources checked
Every check behind this verdict
6 sources checked · all complete. Complete means the check returned a usable result; it does not mean the file is safe.
File fingerprint
- Last analyzed
- Oct 25, 2026, 9:20 AM UTC
- SHA-256
fb95e4b9b53e10871f56f5cf732d464aa6a49e3ae2fc6609c053374d313c0240- SHA-1
af3f235895a159f21850fb7dc49e0aa30f3c8f6b- MD5
ef3bf8a6ed6f1c70eec8317e3fffc38c
About this file
MonoPosixHelper.dll is a Win32 DLL file of 780.3 kB.
- Type and size
- Win32 DLL · 780.3 kB
- Signer
- UnsignedNo code signature.
- First seen
- Nov 20, 2021On VirusTotal.
- Submitted by
- 228 distinct sources
- Packer
- None detected
- Entropy
- 5.58 of 8
First scanned
Includes every engine result (74), 1 matched signature rule, PE section entropy and packers and how widely the file has been seen.
Show the technical evidenceChapter 05
Questions & answers
Short answers to the 6 questions people ask most about this file.
Is MonoPosixHelper.dll safe?
What is MonoPosixHelper.dll?
How many antivirus engines detected MonoPosixHelper.dll?
What is the SHA-256 hash of MonoPosixHelper.dll?
Is it safe to use MonoPosixHelper.dll?
How up to date is this analysis of MonoPosixHelper.dll?
Community
Member reviews and reports for this exact file hash.