MalwareTips
File verdict·MT AI Engine assessment

Our call: Is winmm.dll safe?Suspicious

Do not use it until verified
45Safety ratingElevated risk

Unsigned 64-bit DLL with three tier-1 detections for Malgent but no sandbox malice or external-intel hits.

malgent
Evidence snapshot
  • 11 of 74 antivirus engines flagged the file, including Cynet and Gridinsoft.Observed · Antivirus analysis
  • The hash has been submitted 2,708 times from 2,226 sources.Derived · Saved report facts
winmm.dll
490.5 KB
063a8d5e57cd760a8e…23dc1a2568
Antivirus
11 of 74 flagged
Sandbox
Runtime complete
Code signing
Unsigned
First seen
First seen 3mo ago

Recommended next actions

01

Before using

Do not use it until the source and publisher can be verified independently.

02

If you already used it

Stop using it, scan the device, and watch for unexpected behavior or security alerts. Reinstall the parent software from the developer's official site instead of replacing this component by itself.

Scan transparency

Coverage & freshness

4 of 5 complete

Complete means the check returned a usable result. It does not mean the file is safe.

  • Antivirus

    Complete

    11 of 74 engines flagged the file.

  • Sandbox

    Complete

    1 isolated runtime environment contributed observations.

  • Network

    Not run

    No contacted-host reputation check is recorded.

    No timestamp recorded

  • YARA

    Complete

    Rule evaluation completed with no recorded matches.

  • External intel

    Complete

    3 of 3 independent reference sources completed.

Recorded behavior

Attack story

Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.

ObservedDerived

4 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.

Chapter 02

Intelligence

The saved assessment, checked against the scan evidence and recorded coverage.

MT AI Engine · Verdict analysis

The reasoning behind this verdict

This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.

65%Confidence
High
Analyst conclusion

Three tier-1 engines flag the file as Malgent while one sandbox reports no malicious behaviour. The DLL is unsigned and has medium prevalence across 2,700 submissions.

Where this verdict could be wrong2 caveats
  • If the three tier-1 detections represent a genuine family consensus rather than heuristic overlap, the unsigned DLL could still be malicious despite the single-sandbox clean run.
  • Sandbox coverage is limited to one execution; additional runs might surface different 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.

Recommended action

Treat the file as untrusted; do not execute or distribute until further samples or signatures provide clearer classification.

Chapter 03

Behavior

Plain-English impact first, then the observed runtime evidence.

What this file does

Observed actions and their security significance

  • High concern: Manipulated how the operating system loads code, which can redirect execution.

  • Moderate concern: Contained obfuscated or packed code that makes inspection harder.

  • Moderate concern: Runs hidden system commands (script or shell).

  • Moderate concern: Scans through your files and folders.

  • Note: Reads your Windows user-account details.

  • Note: Listed running processes; both legitimate software and malware may do this.

  • Note: Collects details about your system.

These are observed capabilities from an isolated analysis. A technique does not prove malicious intent on its own, and the file never ran on your device.

Chapter 04

Detection & Forensics

Consensus, attribution, signatures, code structure, prevalence, and identity.

Chapter 05

Safety & FAQ

Complete recovery guidance and answers for the next decision.

What to do now

We couldn't fully clear this file. Treat it with caution.

  1. Don't use it unless you're certain it came from a source you trust.

  2. Check where you got it — an unexpected attachment or a random download link is a red flag.

  3. Do not delete or replace the component manually. Quarantine it with your antivirus or repair the parent software from its official source. Reinstall the parent software from the developer's official site instead of replacing this component by itself.

  4. If you're still unsure, scan it again in a day or two — detections often catch up on newer files.

Frequently asked

Safety FAQ

Is winmm.dll safe, or is it malware?
winmm.dll is suspicious — treat it as unsafe until you're sure. 11 of 74 antivirus engines flag it (family: malgent); that detection signal contributes to the cautious verdict. Don't use it unless you fully trust where it came from. Reinstall the parent software from the developer's official site instead of replacing this component by itself.
What is winmm.dll?
winmm.dll is a Windows library or loadable module, about 491 KB. We identify a file by its cryptographic hash rather than its name, because the same filename can be reused by completely different files — the hash below is the reliable fingerprint.
How many antivirus engines detected winmm.dll?
11 of 74 antivirus engines flagged winmm.dll, 11 of them as outright malicious. The raw count alone does not establish safety or danger; we also weigh which engines flagged it and corroborating behavior, identity, reputation, and rule evidence.
I already downloaded and used winmm.dll — what should I do?
Act quickly. 1) Disconnect the device from the internet to stop the malware communicating or spreading. 2) Run a full scan with reputable anti-malware software (such as Malwarebytes) and quarantine everything it finds. 3) Change your important passwords from a DIFFERENT, clean device — many threats log keystrokes or steal saved credentials. 4) If you bank or shop on this device, watch closely for fraud and alert your bank. 5) For a confirmed infection, the most reliable fix is to back up your personal files and reinstall the operating system for a clean start.
How do I remove winmm.dll?
To remove winmm.dll: 1) restart into Safe Mode (Safe Mode with Networking if you need to download a tool) so the malware doesn't auto-start. 2) Run a full scan with reputable anti-malware software and let it quarantine or delete the detections. 3) Quarantine this component with your antivirus, then repair or reinstall the parent software from its official source. Do not delete or replace the component manually. 4) Check your browser extensions, startup items, and scheduled tasks for anything unfamiliar. 5) Reboot and scan again to confirm it's gone. If detections keep coming back, a clean operating-system reinstall is the most dependable cure.
What kind of malware is winmm.dll?
winmm.dll is classified as a trojan — malware disguised as something harmless to trick you into running it. Engines attribute it to the malgent family. Knowing the family matters because it tells you the likely impact — data theft, remote control, file encryption, or unwanted ads — and guides the cleanup.
What is the SHA-256 hash of winmm.dll?
The SHA-256 hash of winmm.dll is 063a8d5e57cd760a8eafb3573146cc97e18180412a5a0efc23614e23dc1a2568, and its MD5 is 3fb1fae80a788ffd42b7f7047bc0903d. This hash is the file's unique fingerprint — two files with the same SHA-256 are identical. Use it to confirm you're looking at exactly this file (not just one with the same name) when comparing against antivirus databases or a download's published checksum.
How up to date is this analysis of winmm.dll?
This report reflects the scan run on July 29, 2026. Because a file's hash never changes, the identity of winmm.dll is fixed — but antivirus coverage improves over time, so a file that looks clean today can pick up detections later (and vice-versa). If you need the latest picture, MalwareTips staff can re-run the analysis from scratch.
Scan another
Check a different file
URL instead?
Check if a link is safe
The raw file is processed temporarily and is not retained after processing. Its hash and report are public and permanent, so the next person who checks the same file gets an instant answer. Unknown files may be submitted to VirusTotal for analysis. If you ran this file on your computer and are worried, scan your system with an up-to-date antivirus and change critical passwords from a different device.